Data from FDA - Curated by EPG Health - Last updated 22 June 2018

Indication(s)

INDICATIONS AND USAGE CRIXIVAN in combination with antiretroviral agents is indicated for the treatment of HIV infection. This indication is based on two clinical trials of approximately 1 year duration that demonstrated: 1) a reduction in the risk of AIDS-defining illnesses or death; 2) a prolonged suppression of HIV RNA. Description of Studies In all clinical studies, with the exception of ACTG 320, the AMPLICOR HIV MONITOR assay was used to determine the level of circulating HIV RNA in serum. This is an experimental use of the assay. HIV RNA results should not be directly compared to results from other trials using different HIV RNA assays or using other sample sources. Study ACTG 320 was a multicenter, randomized, double-blind clinical endpoint trial to compare the effect of CRIXIVAN in combination with zidovudine and lamivudine with that of zidovudine plus lamivudine on the progression to an AIDS-defining illness (ADI) or death. Patients were protease inhibitor and lamivudine naive and zidovudine experienced, with CD4 cell counts of ≤200 cells/mm3. The study enrolled 1156 HIV-infected patients (17% female, 28% Black, 18% Hispanic, mean age 39 years). The mean baseline CD4 cell count was 87 cells/mm3. The mean baseline HIV RNA was 4.95 log10 copies/mL (89,035 copies/mL). The study was terminated after a planned interim analysis, resulting in a median follow-up of 38 weeks and a maximum follow-up of 52 weeks. Results are shown in Table 4 and Figures 1 & 2. Table 4: ACTG 320 Number (%) of Patients with AIDS-defining Illness or Death Endpoint IDV+ZDV+L (n=577) ZDV+L (n=579) IDV = Indinavir, ZDV = Zidovudine, L = Lamivudine HIV Progression or Death 35 (6.1) 63 (10.9) DeathThe number of deaths is inadequate to assess the impact of Indinavir on survival. 10 (1.7) 19 (3.3) Study ACTG 320: Figure 1 - Indinavir Protocol ACTG 320 Zidovudine Experienced Plasma Viral RNA - Proportions Below 400 copies/mL Study ACTG 320: Figure 2 - ACTG 320 Zidovudine Experienced CD4 Cell Counts - Mean Change from Baseline Study 028, a double-blind, multicenter, randomized, clinical endpoint trial conducted in Brazil, compared the effects of CRIXIVAN plus zidovudine with those of CRIXIVAN alone or zidovudine alone on the progression to an ADI or death, and on surrogate marker responses. All patients were antiretroviral naive with CD4 cell counts of 50 to 250 cells/mm3. The study enrolled 996 HIV-1 seropositive patients [28% female, 11% Black, 1% Asian/Other, median age 33 years, mean baseline CD4 cell count of 152 cells/mm3, mean serum viral RNA of 4.44 log10 copies/mL (27,824 copies/mL)]. Treatment regimens containing zidovudine were modified in a blinded manner with the optional addition of lamivudine (median time: week 40). The median length of follow-up was 56 weeks with a maximum of 97 weeks. The study was terminated after a planned interim analysis, resulting in a median follow-up of 56 weeks and a maximum follow-up of 97 weeks. Results are shown in Table 5 and Figures 3 and 4. Table 5: Protocol 028 Number (%) of Patients with AIDS-defining Illness or Death Endpoint IDV+ZDV (n=332) IDV (n=332) ZDV (n=332) HIV Progression or Death 21 (6.3) 27 (8.1) 62 (18.7) DeathThe number of deaths is inadequate to assess the impact of Indinavir on survival. 8 (2.4) 5 (1.5) 11 (3.3) Study 028: Figure 3 - Indinavir Protocol 028 Zidovudine Naive Viral RNA - Proportions Below 500 Copies/mL in Serum Study 028: Figure 4 - Indinavir Protocol 028 Zidovudine Naive CD4 Cell Counts - Mean Change from Baseline Study 035 was a multicenter, randomized trial in 97 HIV-1 seropositive patients who were zidovudine-experienced (median exposure 30 months), protease-inhibitor- and lamivudine-naive, with mean baseline CD4 count 175 cells/mm3 and mean baseline serum viral RNA 4.62 log10 copies/mL (41,230 copies/mL). Comparisons included CRIXIVAN plus zidovudine plus lamivudine vs. CRIXIVAN alone vs. zidovudine plus lamivudine. After at least 24 weeks of randomized, double-blind therapy, patients were switched to open-label CRIXIVAN plus lamivudine plus zidovudine. Mean changes in log10 viral RNA in serum, the proportions of patients with viral RNA below 500 copies/mL in serum, and mean changes in CD4 cell counts, during 24 weeks of randomized, double-blinded therapy are summarized in Figures 5, 6, and 7, respectively. A limited number of patients remained on randomized, double-blind treatment for longer periods; based on this extended treatment experience, it appears that a greater number of subjects randomized to CRIXIVAN plus zidovudine plus lamivudine demonstrated HIV RNA levels below 500 copies/mL during one year of therapy as compared to those in other treatment groups. Study 035: Figure 5 - Indinavir Protocol 035 Zidovudine Experienced Viral RNA - Mean Log10 Change from Baseline in Serum Study 035: Figure 6 - Indinavir Protocol 035 Zidovudine Experienced Viral RNA - Proportions Below 500 Copies/mL in Serum Study 035: Figure 7 - Indinavir Protocol 035 Zidovudine Experienced CD4 Cell Counts - Mean Change from Baseline Genotypic Resistance in Clinical Studies Study 006 (10/15/93-10/12/94) was a dose-ranging study in which patients were initially treated with CRIXIVAN at a dose of <2.4 g/day followed by 2.4 g/day. Study 019 (6/23/94-4/10/95) was a randomized comparison of CRIXIVAN 600 mg every 6 hours, CRIXIVAN plus zidovudine, and zidovudine alone. Table 6 shows the incidence of genotypic resistance at 24 weeks in these studies. Table 6: Genotypic Resistance at 24 Weeks Treatment Group Resistance to IDV n/NN - includes patients with non-amplifiable virus at 24 weeks who had amplifiable virus at week 0. Resistance to ZDV n/N IDV — — <2.4 g/day 31/37 (84%) — 2.4 g/day 9/21 (43%) 1/17 (6%) IDV/ZDV 4/22 (18%) 1/22 (5%) ZDV 1/18 (6%) 11/17 (65%) image of study ACTG 320 figure 1 image of study ACTG 320 Figure 2 image of study 028 figure 3 image of study 028 figure 4 image of study 035 figure 5 image of study 035 figure 6 image of study 035 figure 7

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Advisory information

contraindications
CONTRAINDICATIONS CRIXIVAN is contraindicated in patients with clinically significant hypersensitivity to any of its components. Inhibition of CYP3A4 by CRIXIVAN can result in elevated plasma concentrations of the following drugs, potentially causing serious and/or life-threatening reactions: Table 7: Drug Interactions With Crixivan: Contraindicated Drugs Drug Class Drugs Within Class That Are Contraindicated With CRIXIVAN Alpha 1-adrenoreceptor antagonist alfuzosin Antiarrhythmics amiodarone Antipsychotics lurasidone, pimozide Ergot derivatives dihydroergotamine, ergonovine, ergotamine, methylergonovine GI motility agents cisapride HMG-CoA Reductase Inhibitors lovastatin, simvastatin PDE5 Inhibitors RevatioRegistered trademark of Pfizer, Inc. (sildenafil) [for treatment of pulmonary arterial hypertension] Sedative/hypnotics oral midazolam, triazolam, alprazolam
Special warnings and precautions
PRECAUTIONS General Indirect hyperbilirubinemia has occurred frequently during treatment with CRIXIVAN and has infrequently been associated with increases in serum transaminases (see also ADVERSE REACTIONS, Clinical Trials and Post-Marketing Experience). It is not known whether CRIXIVAN will exacerbate the physiologic hyperbilirubinemia seen in neonates. (See Pregnancy.) Tubulointerstitial Nephritis Reports of tubulointerstitial nephritis with medullary calcification and cortical atrophy have been observed in patients with asymptomatic severe leukocyturia (>100 cells/ high power field). Patients with asymptomatic severe leukocyturia should be followed closely and monitored frequently with urinalyses. Further diagnostic evaluation may be warranted, and discontinuation of CRIXIVAN should be considered in all patients with severe leukocyturia. Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral therapy, including CRIXIVAN. During the initial phase of combination antiretroviral treatment, patients whose immune system responds may develop an inflammatory response to indolent or residual opportunistic infections (such as Mycobacterium avium infection, cytomegalovirus, Pneumocystis jirovecii pneumonia [PCP], or tuberculosis), which may necessitate further evaluation and treatment. Autoimmune disorders (such as Graves' disease, polymyositis, and Guillain-Barré syndrome) have also been reported to occur in the setting of immune reconstitution; however, the time to onset is more variable, and can occur many months after initiation of treatment. Coexisting Conditions Patients with hemophilia: There have been reports of spontaneous bleeding in patients with hemophilia A and B treated with protease inhibitors. In some patients, additional factor VIII was required. In many of the reported cases, treatment with protease inhibitors was continued or restarted. A causal relationship between protease inhibitor therapy and these episodes has not been established. (See ADVERSE REACTIONS, Post-Marketing Experience.) Patients with hepatic insufficiency due to cirrhosis: In these patients, the dosage of CRIXIVAN should be lowered because of decreased metabolism of CRIXIVAN (see DOSAGE AND ADMINISTRATION). Patients with renal insufficiency: Patients with renal insufficiency have not been studied. Fat Redistribution Redistribution/accumulation of body fat including central obesity, dorsocervical fat enlargement (buffalo hump), peripheral wasting, facial wasting, breast enlargement, and "cushingoid appearance" have been observed in patients receiving antiretroviral therapy. The mechanism and long-term consequences of these events are currently unknown. A causal relationship has not been established. Information for Patients A statement to patients and health care providers is included on the product's bottle label. ALERT: Find out about medicines that should NOT be taken with CRIXIVAN. A Patient Package Insert (PPI) for CRIXIVAN is available for patient information. CRIXIVAN is not a cure for HIV-1 infection and patients may continue to experience illnesses associated with HIV-1 infection, including opportunistic infections. Patients should remain under the care of a physician when using CRIXIVAN. Patients should be advised to avoid doing things that can spread HIV-1 infection to others. Do not share needles or other injection equipment. Do not share personal items that can have blood or body fluids on them, like toothbrushes and razor blades. Do not have any kind of sex without protection. Always practice safe sex by using a latex or polyurethane condom to lower the chance of sexual contact with semen, vaginal secretions, or blood. Do not breastfeed. We do not know if CRIXIVAN can be passed to your baby in your breast milk and whether it could harm your baby. Also, mothers with HIV-1 should not breastfeed because HIV-1 can be passed to the baby in the breast milk. Patients should be advised to remain under the care of a physician when using CRIXIVAN and should not modify or discontinue treatment without first consulting the physician. Therefore, if a dose is missed, patients should take the next dose at the regularly scheduled time and should not double this dose. Therapy with CRIXIVAN should be initiated and maintained at the recommended dosage. CRIXIVAN may interact with some drugs; therefore, patients should be advised to report to their doctor the use of any other prescription, non-prescription medication or herbal products, particularly St. John's wort. For optimal absorption, CRIXIVAN should be administered without food but with water 1 hour before or 2 hours after a meal. Alternatively, CRIXIVAN may be administered with other liquids such as skim milk, juice, coffee, or tea, or with a light meal, e.g., dry toast with jelly, juice, and coffee with skim milk and sugar; or corn flakes, skim milk and sugar (see CLINICAL PHARMACOLOGY, Effect of Food on Oral Absorption and DOSAGE AND ADMINISTRATION). Ingestion of CRIXIVAN with a meal high in calories, fat, and protein reduces the absorption of indinavir. Patients receiving a phosphodiesterase type 5 (PDE5) inhibitor (sildenafil, tadalafil, or vardenafil) should be advised that they may be at an increased risk of PDE5 inhibitor-associated adverse events including hypotension, visual changes, and priapism, and should promptly report any symptoms to their doctors (see CONTRAINDICATIONS and WARNINGS, Drug Interactions). Patients should be informed that redistribution or accumulation of body fat may occur in patients receiving antiretroviral therapy and that the cause and long-term health effects of these conditions are not known at this time. CRIXIVAN Capsules are sensitive to moisture. Patients should be informed that CRIXIVAN should be stored and used in the original container and the desiccant should remain in the bottle. Drug Interactions Indinavir is an inhibitor of the cytochrome P450 isoform CYP3A4. Coadministration of CRIXIVAN and drugs primarily metabolized by CYP3A4 may result in increased plasma concentrations of the other drug, which could increase or prolong its therapeutic and adverse effects (see CONTRAINDICATIONS and WARNINGS). Indinavir is metabolized by CYP3A4. Drugs that induce CYP3A4 activity would be expected to increase the clearance of indinavir, resulting in lowered plasma concentrations of indinavir. Coadministration of CRIXIVAN and other drugs that inhibit CYP3A4 may decrease the clearance of indinavir and may result in increased plasma concentrations of indinavir. Table 8: Drugs That Should Not Be Coadministered with CRIXIVAN Drug Class: Drug Name Clinical Comment Alpha 1-adrenoreceptor antagonist: alfuzosin Potentially increased alfuzosin concentrations can result in hypotension. Antiarrhythmics: amiodarone CONTRAINDICATED due to potential for serious and/or life-threatening reactions such as cardiac arrhythmias. Antimycobacterial: rifampin May lead to loss of virologic response and possible resistance to CRIXIVAN or to the class of protease inhibitors or other coadministered antiretroviral agents. Antipsychotics: lurasidone pimozide CONTRAINDICATED due to potential for serious and/or life-threatening reactions. CONTRAINDICATED due to potential for serious and/or life-threatening reactions such as cardiac arrhythmias. Ergot derivatives: dihydroergotamine, ergonovine, ergotamine, methylergonovine CONTRAINDICATED due to potential for serious and/or life-threatening reactions such as acute ergot toxicity characterized by peripheral vasospasm and ischemia of the extremities and other tissues. GI motility agents: cisapride CONTRAINDICATED due to potential for serious and/or life-threatening reactions such as cardiac arrhythmias. Herbal products: St. John's wort (Hypericum perforatum) May lead to loss of virologic response and possible resistance to CRIXIVAN or to the class of protease inhibitors. HMG-CoA Reductase inhibitors: lovastatin, simvastatin CONTRAINDICATED due to an increased risk for serious reactions such as myopathy including rhabdomyolysis. PDE5 inhibitor: RevatioRegistered trademark of Pfizer, Inc. (sildenafil) [for treatment of pulmonary arterial hypertension] A safe and effective dose has not been established when used with CRIXIVAN. There is increased potential for sildenafil-associated adverse events (which include visual disturbances, hypotension, prolonged erection, and syncope). Protease inhibitor: atazanavir Both CRIXIVAN and atazanavir are associated with indirect (unconjugated) hyperbilirubinemia. Combinations of these drugs have not been studied and coadministration of CRIXIVAN and atazanavir is not recommended. Sedative/hypnotics: Oral midazolam, triazolam, alprazolam CONTRAINDICATED due to potential for serious and/or life-threatening reactions such as prolonged or increased sedation or respiratory depression. Table 9: Established and Other Potentially Significant Drug Interactions: Alteration in Dose or Regimen May Be Recommended Based on Drug Interaction Studies or Predicted Interaction (See also CLINICAL PHARMACOLOGY for magnitude of interaction, WARNINGS and DOSAGE AND ADMINISTRATION.) Drug Name Effect Clinical Comment HIV Antiviral Agents Note: ↑ = increase; ↓ = decrease Delavirdine ↑ indinavir concentration Dose reduction of CRIXIVAN to 600 mg every 8 hours should be considered when taking delavirdine 400 mg three times a day. Didanosine Indinavir and didanosine formulations containing buffer should be administered at least one hour apart on an empty stomach. Efavirenz ↓ indinavir concentration The optimal dose of indinavir, when given in combination with efavirenz, is not known. Increasing the indinavir dose to 1000 mg every 8 hours does not compensate for the increased indinavir metabolism due to efavirenz. Nelfinavir ↑ indinavir concentration The appropriate doses for this combination, with respect to efficacy and safety, have not been established. Nevirapine ↓ indinavir concentration Indinavir concentrations may be decreased in the presence of nevirapine. The appropriate doses for this combination, with respect to efficacy and safety, have not been established. Ritonavir ↑ indinavir concentration ↑ ritonavir concentration The appropriate doses for this combination, with respect to efficacy and safety, have not been established. Preliminary clinical data suggest that the incidence of nephrolithiasis is higher in patients receiving indinavir in combination with ritonavir than those receiving CRIXIVAN 800 mg q8h. Saquinavir ↑ saquinavir concentration The appropriate doses for this combination, with respect to efficacy and safety, have not been established. Other Agents Antiarrhythmics: bepridil, lidocaine(systemic) and quinidine ↑ antiarrhythmic agents concentration Caution is warranted and therapeutic concentration monitoring is recommended for antiarrhythmics when coadministered with CRIXIVAN. Anticonvulsants: carbamazepine, phenobarbital, phenytoin ↓ indinavir concentration Use with caution. CRIXIVAN may not be effective due to decreased indinavir concentrations in patients taking these agents concomitantly. Antidepressant: Trazodone ↑ trazodone concentration Concomitant use of trazodone and CRIXIVAN may increase plasma concentrations of trazodone. Adverse events of nausea, dizziness, hypotension and syncope have been observed following coadministration of trazodone and ritonavir. If trazodone is used with a CYP3A4 inhibitor such as CRIXIVAN, the combination should be used with caution and a lower dose of trazodone should be considered. Anti-gout: Colchicine ↑ colchicine concentration Patients with renal or hepatic impairment should not be given colchicine with CRIXIVAN. Treatment of gout flares: Co-administration of colchicine in patients on CRIXIVAN: 0.6 mg (1 tablet) x 1 dose, followed by 0.3 mg (half tablet) 1 hour later. Dose to be repeated no earlier than 3 days. Prophylaxis of gout flares: Co-administration of colchicine in patients on CRIXIVAN: If the original colchicine regimen was 0.6 mg twice a day, the regimen should be adjusted to 0.3 mg once a day. If the original colchicine regimen was 0.6 mg once a day, the regimen should be adjusted to 0.3 mg once every other day. Treatment of familial Mediterranean fever (FMF): Co-administration of colchicine in patients on CRIXIVAN: Maximum daily dose of 0.6 mg (may be given as 0.3 mg twice a day). Antipsychotics: Quetiapine ↑ quetiapine Initiation of CRIXIVAN in patients taking quetiapine: Consider alternative antiretroviral therapy to avoid increases in quetiapine drug exposures. If coadministration is necessary, reduce the quetiapine dose to 1/6 of the current dose and monitor for quetiapine-associated adverse reactions. Refer to the quetiapine prescribing information for recommendations on adverse reaction monitoring. Initiation of quetiapine in patients taking CRIXIVAN: Refer to the quetiapine prescribing information for initial dosing and titration of quetiapine. Calcium Channel Blockers, Dihydropyridine: e.g., felodipine, nifedipine, nicardipine ↑ dihydropyridine calcium channel blockers concentration Caution is warranted and clinical monitoring of patients is recommended. Clarithromycin ↑ clarithromycin concentration ↑ indinavir concentration The appropriate doses for this combination, with respect to efficacy and safety, have not been established. Endothelin receptor antagonist: Bosentan ↑ bosentan concentration Co-administration of bosentan in patients on CRIXIVAN or co-administration of CRIXIVAN in patients on bosentan: Start at or adjust bosentan to 62.5 mg once daily or every other day based upon individual tolerability. HMG-CoA Reductase Inhibitors: atorvastatin, rosuvastatin ↑ atorvastatin concentration ↑ rosuvastatin concentration The atorvastatin and rosuvastatin doses should be carefully titrated; use the lowest dose necessary with careful monitoring during treatment with CRIXIVAN. Immunosuppressants: cyclosporine, tacrolimus, sirolimus ↑ immunosuppressant agents concentration Plasma concentrations may be increased by CRIXIVAN. Inhaled beta agonist: Salmeterol ↑ salmeterol Concurrent administration of salmeterol with CRIXIVAN is not recommended. The combination may result in increased risk of cardiovascular adverse events associated with salmeterol, including QT prolongation, palpitations and sinus tachycardia. Inhaled/nasal steroid: Fluticasone ↑ fluticasone concentration Concomitant use of fluticasone propionate and CRIXIVAN may increase plasma concentrations of fluticasone propionate. Use with caution. Consider alternatives to fluticasone propionate, particularly for long-term use. Fluticasone use is not recommended in situations where CRIXIVAN is coadministered with a potent CYP3A4 inhibitor such as ritonavir unless the potential benefit to the patient outweighs the risk of systemic corticosteroid side effects. Itraconazole ↑ indinavir concentration Dose reduction of CRIXIVAN to 600 mg every 8 hours is recommended when administering itraconazole concurrently. Ketoconazole ↑ indinavir concentration Dose reduction of CRIXIVAN to 600 mg every 8 hours should be considered. Midazolam (parenteral administration) ↑ midazolam concentration Concomitant use of parenteral midazolam with CRIXIVAN may increase plasma concentrations of midazolam. Coadministration should be done in a setting which ensures close clinical monitoring and appropriate medical management in case of respiratory depression and/or prolonged sedation. Dosage reduction for midazolam should be considered, especially if more than a single dose of midazolam is administered. Coadministration of oral midazolam with CRIXIVAN is CONTRAINDICATED (see Table 8). Rifabutin ↓ indinavir concentration ↑ rifabutin concentration Dose reduction of rifabutin to half the standard dose and a dose increase of CRIXIVAN to 1000 mg every 8 hours are recommended when rifabutin and CRIXIVAN are coadministered. Sildenafil ↑ sildenafil concentration (only the use of sildenafil at doses used for treatment of erectile dysfunction has been studied with CRIXIVAN) May result in an increase in PDE5 inhibitor-associated adverse events, including hypotension, syncope, visual disturbances, and priapism. Use of sildenafil for pulmonary arterial hypertension (PAH): Use of RevatioRegistered trademark of Pfizer, Inc. (sildenafil) is contraindicated when used for the treatment of pulmonary arterial hypertension (PAH) [see CONTRAINDICATIONS]. Use of sildenafil for erectile dysfunction: Sildenafil dose should not exceed a maximum of 25 mg in a 48-hour period in patients receiving concomitant CRIXIVAN therapy. Use with increased monitoring for adverse events. Tadalafil ↑ tadalafil concentration May result in an increase in PDE5 inhibitor-associated adverse events, including hypotension, visual disturbances, and priapism. Use of tadalafil for pulmonary arterial hypertension (PAH): The following dose adjustments are recommended for use of AdcircaRegistered trademark of Eli Lilly and Company. (tadalafil) with CRIXIVAN: Co-administration of Adcirca in patients on CRIXIVAN or co-administration of CRIXIVAN in patients on Adcirca: Start at or adjust Adcirca to 20 mg once daily. Increase to 40 mg once daily based upon individual tolerability. Use of tadalafil for erectile dysfunction: Tadalafil dose should not exceed a maximum of 10 mg in a 72-hour period in patients receiving concomitant CRIXIVAN therapy. Use with increased monitoring for adverse events. Vardenafil ↑ vardenafil concentration Vardenafil dose should not exceed a maximum of 2.5 mg in a 24-hour period in patients receiving concomitant indinavir therapy. Venlafaxine ↓ indinavir concentration In a study of 9 healthy volunteers, venlafaxine administered under steady-state conditions at 150 mg/day resulted in a 28% decrease in the AUC of a single 800 mg oral dose of indinavir and a 36% decrease in indinavir Cmax. Indinavir did not affect the pharmacokinetics of venlafaxine and ODV. The clinical significance of this finding is unknown. Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenicity studies were conducted in mice and rats. In mice, no increased incidence of any tumor type was observed. The highest dose tested in rats was 640 mg/kg/day; at this dose a statistically significant increased incidence of thyroid adenomas was seen only in male rats. At that dose, daily systemic exposure in rats was approximately 1.3 times higher than daily systemic exposure in humans. No evidence of mutagenicity or genotoxicity was observed in in vitro microbial mutagenesis (Ames) tests, in vitro alkaline elution assays for DNA breakage, in vitro and in vivo chromosomal aberration studies, and in vitro mammalian cell mutagenesis assays. No treatment-related effects on mating, fertility, or embryo survival were seen in female rats and no treatment-related effects on mating performance were seen in male rats at doses providing systemic exposure comparable to or slightly higher than that with the clinical dose. In addition, no treatment-related effects were observed in fecundity or fertility of untreated females mated to treated males. Pregnancy Pregnancy Category C: Developmental toxicity studies were performed in rabbits (at doses up to 240 mg/kg/day), dogs (at doses up to 80 mg/kg/day), and rats (at doses up to 640 mg/kg/day). The highest doses in these studies produced systemic exposures in these species comparable to or slightly greater than human exposure. No treatment-related external, visceral, or skeletal changes were observed in rabbits or dogs. No treatment-related external or visceral changes were observed in rats. Treatment-related increases over controls in the incidence of supernumerary ribs (at exposures at or below those in humans) and of cervical ribs (at exposures comparable to or slightly greater than those in humans) were seen in rats. In all three species, no treatment-related effects on embryonic/fetal survival or fetal weights were observed. In rabbits, at a maternal dose of 240 mg/kg/day, no drug was detected in fetal plasma 1 hour after dosing. Fetal plasma drug levels 2 hours after dosing were approximately 3% of maternal plasma drug levels. In dogs, at a maternal dose of 80 mg/kg/day, fetal plasma drug levels were approximately 50% of maternal plasma drug levels both 1 and 2 hours after dosing. In rats, at maternal doses of 40 and 640 mg/kg/day, fetal plasma drug levels were approximately 10 to 15% and 10 to 20% of maternal plasma drug levels 1 and 2 hours after dosing, respectively. Indinavir was administered to Rhesus monkeys during the third trimester of pregnancy (at doses up to 160 mg/kg twice daily) and to neonatal Rhesus monkeys (at doses up to 160 mg/kg twice daily). When administered to neonates, indinavir caused an exacerbation of the transient physiologic hyperbilirubinemia seen in this species after birth; serum bilirubin values were approximately fourfold above controls at 160 mg/kg twice daily. A similar exacerbation did not occur in neonates after in utero exposure to indinavir during the third trimester of pregnancy. In Rhesus monkeys, fetal plasma drug levels were approximately 1 to 2% of maternal plasma drug levels approximately 1 hour after maternal dosing at 40, 80, or 160 mg/kg twice daily. Hyperbilirubinemia has occurred during treatment with CRIXIVAN (see PRECAUTIONS and ADVERSE REACTIONS). It is unknown whether CRIXIVAN administered to the mother in the perinatal period will exacerbate physiologic hyperbilirubinemia in neonates. There are no adequate and well-controlled studies in pregnant patients. CRIXIVAN should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. A CRIXIVAN dose of 800 mg every 8 hours (with zidovudine 200 mg every 8 hours and lamivudine 150 mg twice a day) has been studied in 16 HIV-infected pregnant patients at 14 to 28 weeks of gestation at enrollment (study PACTG 358). Given the substantially lower antepartum exposures observed and the limited data in this patient population, indinavir use is not recommended in HIV-infected pregnant patients (see CLINICAL PHARMACOLOGY, Pregnant Patients). Antiretroviral Pregnancy Registry To monitor maternal-fetal outcomes of pregnant patients exposed to CRIXIVAN, an Antiretroviral Pregnancy Registry has been established. Physicians are encouraged to register patients by calling 1-800-258-4263. Nursing Mothers Studies in lactating rats have demonstrated that indinavir is excreted in milk. Although it is not known whether CRIXIVAN is excreted in human milk, there exists the potential for adverse effects from indinavir in nursing infants. Mothers should be instructed to discontinue nursing if they are receiving CRIXIVAN. This is consistent with the recommendation by the U.S. Public Health Service Centers for Disease Control and Prevention that HIV-infected mothers not breast-feed their infants to avoid risking postnatal transmission of HIV. Pediatric Use The optimal dosing regimen for use of indinavir in pediatric patients has not been established. A dose of 500 mg/m2 every eight hours has been studied in uncontrolled studies of 70 children, 3 to 18 years of age. The pharmacokinetic profiles of indinavir at this dose were not comparable to profiles previously observed in adults receiving the recommended dose (see CLINICAL PHARMACOLOGY, Pediatric). Although viral suppression was observed in some of the 32 children who were followed on this regimen through 24 weeks, a substantially higher rate of nephrolithiasis was reported when compared to adult historical data (see WARNINGS, Nephrolithiasis/Urolithiasis). Physicians considering the use of indinavir in pediatric patients without other protease inhibitor options should be aware of the limited data available in this population and the increased risk of nephrolithiasis. Geriatric Use Clinical studies of CRIXIVAN did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. In general, dose selection for an elderly patient should be cautious, reflecting the greater frequency of decreased hepatic, renal or cardiac function and of concomitant disease or other drug therapy.
Adverse reactions
ADVERSE REACTIONS Clinical Trials in Adults Nephrolithiasis/urolithiasis, including flank pain with or without hematuria (including microscopic hematuria), has been reported in approximately 12.4% (301/2429; range across individual trials: 4.7% to 34.4%) of patients receiving CRIXIVAN at the recommended dose in clinical trials with a median follow-up of 47 weeks (range: 1 day to 242 weeks; 2238 patient-years follow-up). The cumulative frequency of nephrolithiasis events increases with duration of exposure to CRIXIVAN; however, the risk over time remains relatively constant. Of the patients treated with CRIXIVAN who developed nephrolithiasis/urolithiasis in clinical trials during the double-blind phase, 2.8% (7/246) were reported to develop hydronephrosis and 4.5% (11/246) underwent stent placement. Following the acute episode, 4.9% (12/246) of patients discontinued therapy. (See WARNINGS and DOSAGE AND ADMINISTRATION, Nephrolithiasis/Urolithiasis.) Asymptomatic hyperbilirubinemia (total bilirubin ≥2.5 mg/dL), reported predominantly as elevated indirect bilirubin, has occurred in approximately 14% of patients treated with CRIXIVAN. In <1% this was associated with elevations in ALT or AST. Hyperbilirubinemia and nephrolithiasis/urolithiasis occurred more frequently at doses exceeding 2.4 g/day compared to doses ≤2.4 g/day. Clinical adverse experiences reported in ≥2% of patients treated with CRIXIVAN alone, CRIXIVAN in combination with zidovudine or zidovudine plus lamivudine, zidovudine alone, or zidovudine plus lamivudine are presented in Table 10. Table 10: Clinical Adverse Experiences Reported in ≥2% of Patients Study 028 Considered Drug-Related and of Moderate or Severe Intensity Study ACTG 320 of Unknown Drug Relationship and of Severe or Life-threatening Intensity CRIXIVAN CRIXIVAN plus Zidovudine Zidovudine CRIXIVAN plus Zidovudine plus Lamivudine Zidovudine plus Lamivudine Adverse Experience Percent (n=332) Percent (n=332) Percent (n=332) Percent (n=571) Percent (n=575) Body as a Whole Abdominal pain 16.6 16.0 12.0 1.9 0.7 Asthenia/fatigue 2.1 4.2 3.6 2.4 4.5 Fever 1.5 1.5 2.1 3.8 3.0 Malaise 2.1 2.7 1.8 0 0 Digestive System Nausea 11.7 31.9 19.6 2.8 1.4 Diarrhea 3.3 3.0 2.4 0.9 1.2 Vomiting 8.4 17.8 9.0 1.4 1.4 Acid regurgitation 2.7 5.4 1.8 0.4 0 Anorexia 2.7 5.4 3.0 0.5 0.2 Appetite increase 2.1 1.5 1.2 0 0 Dyspepsia 1.5 2.7 0.9 0 0 Jaundice 1.5 2.1 0.3 0 0 Hemic and Lymphatic System Anemia 0.6 1.2 2.1 2.4 3.5 Musculoskeletal System Back pain 8.4 4.5 1.5 0.9 0.7 Nervous System/Psychiatric Headache 5.4 9.6 6.0 2.4 2.8 Dizziness 3.0 3.9 0.9 0.5 0.7 Somnolence 2.4 3.3 3.3 0 0 Skin and Skin Appendage Pruritus 4.2 2.4 1.8 0.5 0 Rash 1.2 0.6 2.4 1.1 0.5 Respiratory System Cough 1.5 0.3 0.6 1.6 1.0 Difficulty breathing/ dyspnea/ shortness of breath 0 0.6 0.3 1.8 1.0 Urogenital System Nephrolithiasis/urolithiasisIncluding renal colic, and flank pain with and without hematuria 8.7 7.8 2.1 2.6 0.3 Dysuria 1.5 2.4 0.3 0.4 0.2 Special Senses Taste perversion 2.7 8.4 1.2 0.2 0 In Phase I and II controlled trials, the following adverse events were reported significantly more frequently by those randomized to the arms containing CRIXIVAN than by those randomized to nucleoside analogues: rash, upper respiratory infection, dry skin, pharyngitis, taste perversion. Selected laboratory abnormalities of severe or life-threatening intensity reported in patients treated with CRIXIVAN alone, CRIXIVAN in combination with zidovudine or zidovudine plus lamivudine, zidovudine alone, or zidovudine plus lamivudine are presented in Table 11. Table 11: Selected Laboratory Abnormalities of Severe or Life-threatening Intensity Reported in Studies 028 and ACTG 320 Study 028 Study ACTG 320 CRIXIVAN CRIXIVAN plus Zidovudine Zidovudine CRIXIVAN plus Zidovudine plus Lamivudine Zidovudine plus Lamivudine Percent (n=329) Percent (n=320) Percent (n=330) Percent (n=571) Percent (n=575) Hematology Decreased hemoglobin <7.0 g/dL 0.6 0.9 3.3 2.4 3.5 Decreased platelet count <50 THS/mm3 0.9 0.9 1.8 0.2 0.9 Decreased neutrophils <0.75 THS/mm3 2.4 2.2 6.7 5.1 14.6 Blood chemistry Increased ALT >500% ULNUpper limit of the normal range. 4.9 4.1 3.0 2.6 2.6 Increased AST >500% ULN 3.7 2.8 2.7 3.3 2.8 Total serum bilirubin >250% ULN 11.9 9.7 0.6 6.1 1.4 Increased serum amylase >200% ULN 2.1 1.9 1.8 0.9 0.3 Increased glucose >250 mg/dL 0.9 0.9 0.6 1.6 1.9 Increased creatinine >300% ULN 0 0 0.6 0.2 0 Post-Marketing Experience Body As A Whole: redistribution/accumulation of body fat (see PRECAUTIONS, Fat Redistribution). Cardiovascular System: cardiovascular disorders including myocardial infarction and angina pectoris; cerebrovascular disorder. Digestive System: liver function abnormalities; hepatitis including reports of hepatic failure (see WARNINGS); pancreatitis; jaundice; abdominal distention; dyspepsia. Hematologic: increased spontaneous bleeding in patients with hemophilia (see PRECAUTIONS); acute hemolytic anemia (see WARNINGS). Endocrine/Metabolic: new onset diabetes mellitus, exacerbation of pre-existing diabetes mellitus, hyperglycemia (see WARNINGS). Hypersensitivity: anaphylactoid reactions; urticaria; vasculitis. Musculoskeletal System: arthralgia, periarthritis. Nervous System/Psychiatric: oral paresthesia; depression. Skin and Skin Appendage: rash including erythema multiforme and Stevens-Johnson syndrome; hyperpigmentation; alopecia; ingrown toenails and/or paronychia; pruritus. Urogenital System: nephrolithiasis/urolithiasis, in some cases resulting in renal insufficiency or acute renal failure, pyelonephritis with or without bacteremia (see WARNINGS); interstitial nephritis sometimes with indinavir crystal deposits; in some patients, the interstitial nephritis did not resolve following discontinuation of CRIXIVAN; renal insufficiency; renal failure; leukocyturia (see PRECAUTIONS), crystalluria; dysuria. Laboratory Abnormalities Increased serum triglycerides; increased serum cholesterol.

Usage information

Dosing and administration
DOSAGE AND ADMINISTRATION The recommended dosage of CRIXIVAN is 800 mg (usually two 400-mg capsules) orally every 8 hours. CRIXIVAN must be taken at intervals of 8 hours. For optimal absorption, CRIXIVAN should be administered without food but with water 1 hour before or 2 hours after a meal. Alternatively, CRIXIVAN may be administered with other liquids such as skim milk, juice, coffee, or tea, or with a light meal, e.g., dry toast with jelly, juice, and coffee with skim milk and sugar; or corn flakes, skim milk and sugar. (See CLINICAL PHARMACOLOGY, Effect of Food on Oral Absorption.) To ensure adequate hydration, it is recommended that adults drink at least 1.5 liters (approximately 48 ounces) of liquids during the course of 24 hours. Concomitant Therapy (See CLINICAL PHARMACOLOGY, Drug Interactions, and/or PRECAUTIONS, Drug Interactions.) Delavirdine Dose reduction of CRIXIVAN to 600 mg every 8 hours should be considered when administering delavirdine 400 mg three times a day. Didanosine If indinavir and didanosine are administered concomitantly, they should be administered at least one hour apart on an empty stomach (consult the manufacturer's product circular for didanosine). Itraconazole Dose reduction of CRIXIVAN to 600 mg every 8 hours is recommended when administering itraconazole 200 mg twice daily concurrently. Ketoconazole Dose reduction of CRIXIVAN to 600 mg every 8 hours is recommended when administering ketoconazole concurrently. Rifabutin Dose reduction of rifabutin to half the standard dose (consult the manufacturer's product circular for rifabutin) and a dose increase of CRIXIVAN to 1000 mg every 8 hours are recommended when rifabutin and CRIXIVAN are coadministered. Hepatic Insufficiency The dosage of CRIXIVAN should be reduced to 600 mg every 8 hours in patients with mild-to-moderate hepatic insufficiency due to cirrhosis. Nephrolithiasis/Urolithiasis In addition to adequate hydration, medical management in patients who experience nephrolithiasis/urolithiasis may include temporary interruption (e.g., 1 to 3 days) or discontinuation of therapy.
Use in special populations
Special Populations Hepatic Insufficiency: Patients with mild to moderate hepatic insufficiency and clinical evidence of cirrhosis had evidence of decreased metabolism of indinavir resulting in approximately 60% higher mean AUC following a single 400-mg dose (n=12). The half-life of indinavir increased to 2.8 ± 0.5 hours. Indinavir pharmacokinetics have not been studied in patients with severe hepatic insufficiency (see DOSAGE AND ADMINISTRATION, Hepatic Insufficiency). Renal Insufficiency: The pharmacokinetics of indinavir have not been studied in patients with renal insufficiency. Gender: The effect of gender on the pharmacokinetics of indinavir was evaluated in 10 HIV seropositive women who received CRIXIVAN 800 mg every 8 hours with zidovudine 200 mg every 8 hours and lamivudine 150 mg twice a day for one week. Indinavir pharmacokinetic parameters in these women were compared to those in HIV seropositive men (pooled historical control data). Differences in indinavir exposure, peak concentrations, and trough concentrations between males and females are shown in Table 1 below: Table 1 PK Parameter % change in PK parameter for females relative to males 90% Confidence Interval ↓Indicates a decrease in the PK parameter; ↑indicates an increase in the PK parameter. AUC0-8h (nM•hr) ↓13% (↓32%, ↑12%) Cmax (nM) ↓13% (↓32%, ↑10%) C8h (nM) ↓22% (↓47%, ↑15%) The clinical significance of these gender differences in the pharmacokinetics of indinavir is not known. Race: Pharmacokinetics of indinavir appear to be comparable in Caucasians and Blacks based on pharmacokinetic studies including 42 Caucasians (26 HIV-positive) and 16 Blacks (4 HIV-positive). Pediatric: The optimal dosing regimen for use of indinavir in pediatric patients has not been established. In HIV-infected pediatric patients (age 4-15 years), a dosage regimen of indinavir capsules, 500 mg/m2 every 8 hours, produced AUC0-8hr of 38,742 ± 24,098 nM•hour (n=34), Cmax of 17,181 ± 9809 nM (n=34), and trough concentrations of 134 ± 91 nM (n=28). The pharmacokinetic profiles of indinavir in pediatric patients were not comparable to profiles previously observed in HIV-infected adults receiving the recommended dose of 800 mg every 8 hours. The AUC and Cmax values were slightly higher and the trough concentrations were considerably lower in pediatric patients. Approximately 50% of the pediatric patients had trough values below 100 nM; whereas, approximately 10% of adult patients had trough levels below 100 nM. The relationship between specific trough values and inhibition of HIV replication has not been established. Pregnant Patients: The optimal dosing regimen for use of indinavir in pregnant patients has not been established. A CRIXIVAN dose of 800 mg every 8 hours (with zidovudine 200 mg every 8 hours and lamivudine 150 mg twice a day) has been studied in 16 HIV-infected pregnant patients at 14 to 28 weeks of gestation at enrollment (study PACTG 358). The mean indinavir plasma AUC0-8hr at weeks 30-32 of gestation (n=11) was 9231 nM•hr, which is 74% (95% CI: 50%, 86%) lower than that observed 6 weeks postpartum. Six of these 11 (55%) patients had mean indinavir plasma concentrations 8 hours post-dose (Cmin) below assay threshold of reliable quantification. The pharmacokinetics of indinavir in these 11 patients at 6 weeks postpartum were generally similar to those observed in non-pregnant patients in another study (see PRECAUTIONS, Pregnancy).
Pregnancy and lactation
Nursing Mothers Studies in lactating rats have demonstrated that indinavir is excreted in milk. Although it is not known whether CRIXIVAN is excreted in human milk, there exists the potential for adverse effects from indinavir in nursing infants. Mothers should be instructed to discontinue nursing if they are receiving CRIXIVAN. This is consistent with the recommendation by the U.S. Public Health Service Centers for Disease Control and Prevention that HIV-infected mothers not breast-feed their infants to avoid risking postnatal transmission of HIV.

Interactions

Drug Interactions: (also see CONTRAINDICATIONS, WARNINGS, PRECAUTIONS, Drug Interactions) Indinavir is an inhibitor of the cytochrome P450 isoform CYP3A4. Coadministration of CRIXIVAN and drugs primarily metabolized by CYP3A4 may result in increased plasma concentrations of the other drug, which could increase or prolong its therapeutic and adverse effects (see CONTRAINDICATIONS and WARNINGS). Based on in vitro data in human liver microsomes, indinavir does not inhibit CYP1A2, CYP2C9, CYP2E1 and CYP2B6. However, indinavir may be a weak inhibitor of CYP2D6. Indinavir is metabolized by CYP3A4. Drugs that induce CYP3A4 activity would be expected to increase the clearance of indinavir, resulting in lowered plasma concentrations of indinavir. Coadministration of CRIXIVAN and other drugs that inhibit CYP3A4 may decrease the clearance of indinavir and may result in increased plasma concentrations of indinavir. Drug interaction studies were performed with CRIXIVAN and other drugs likely to be coadministered and some drugs commonly used as probes for pharmacokinetic interactions. The effects of coadministration of CRIXIVAN on the AUC, Cmax and Cmin are summarized in Table 2 (effect of other drugs on indinavir) and Table 3 (effect of indinavir on other drugs). For information regarding clinical recommendations, see Table 9 in PRECAUTIONS. Table 2: Drug Interactions: Pharmacokinetic Parameters for Indinavir in the Presence of the Coadministered Drug (See PRECAUTIONS, Table 9 for Recommended Alterations in Dose or Regimen) Coadministered drug Dose of Coadministered drug (mg) Dose of CRIXIVAN (mg) n Ratio (with/without coadministered drug) of Indinavir Pharmacokinetic Parameters (90% CI); No Effect = 1.00 Cmax AUC Cmin All interaction studies conducted in healthy, HIV-negative adult subjects, unless otherwise indicated. Cimetidine 600 twice daily, 6 days 400 single dose 12 1.07 (0.77, 1.49) 0.98 (0.81, 1.19) 0.82 (0.69, 0.99) Clarithromycin 500 q12h, 7 days 800 three times daily, 7 days 10 1.08 (0.85, 1.38) 1.19 (1.00, 1.42) 1.57 (1.16, 2.12) Delavirdine 400 three times daily 400 three times daily, 7 days 28 0.64Relative to indinavir 800 mg three times daily alone. (0.48, 0.86) No significant change 2.18 (1.16, 4.12) Delavirdine 400 three times daily 600 three times daily, 7 days 28 No significant change 1.53 (1.07, 2.20) 3.98 (2.04, 7.78) EfavirenzStudy conducted in HIV-positive subjects. 600 once daily, 10 days 1000 three times daily, 10 days 20 After morning dose No significant change 0.67 (0.61, 0.74) 0.61 (0.49, 0.76) After afternoon dose No significant change 0.63 (0.54, 0.74) 0.48 (0.43, 0.53) After evening dose 0.71 (0.57, 0.89) 0.54 (0.46, 0.63) 0.43 (0.37, 0.50) Fluconazole 400 once daily, 8 days 1000 three times daily, 7 days 11 0.87 (0.72, 1.05) 0.76 (0.59, 0.98) 0.90 (0.72, 1.12) Grapefruit Juice 8 oz. 400 single dose 10 0.65 (0.53, 0.79) 0.73 (0.60, 0.87) 0.90 (0.71, 1.15) Isoniazid 300 once daily in the morning, 8 days 800 three times daily, 7 days 11 0.95 (0.88, 1.03) 0.99 (0.87, 1.13) 0.89 (0.75, 1.06) Itraconazole 200 twice daily, 7 days 600 three times daily, 7 days 12 0.78 (0.69, 0.88) 0.99 (0.91, 1.06) 1.49 (1.28, 1.74) Ketoconazole 400 once daily, 7 days 600 three times daily, 7 days 12 0.69 (0.61, 0.78) 0.80 (0.74, 0.87) 1.29 (1.11, 1.51) 400 once daily, 7 days 400 three times daily, 7 days 12 0.42 (0.37, 0.47) 0.44 (0.41, 0.48) 0.73 (0.62, 0.85) Methadone 20-60 once daily in the morning, 8 days 800 three times daily, 8 days 10 See text below for discussion of interaction. Quinidine 200 single dose 400 single dose 10 0.96 (0.79, 1.18) 1.07 (0.89, 1.28) 0.93 (0.73, 1.19) Rifabutin 150 once daily in the morning, 10 days 800 three times daily, 10 days 14 0.80 (0.72, 0.89) 0.68 (0.60, 0.76) 0.60 (0.51, 0.72) Rifabutin 300 once daily in the morning, 10 days 800 three times daily, 10 days 10 0.75 (0.61, 0.91) 0.66 (0.56, 0.77) 0.61 (0.50, 0.75) Rifampin 600 once daily in the morning, 8 days 800 three times daily, 7 days 12 0.13 (0.08, 0.22) 0.08 (0.06, 0.11) Not Done Ritonavir 100 twice daily, 14 days 800 twice daily, 14 days 10, 16Comparison to historical data on 16 subjects receiving indinavir alone. See text below for discussion of interaction. Ritonavir 200 twice daily, 14 days 800 twice daily,14 days 9, 16 See text below for discussion of interaction. Sildenafil 25 single dose 800 three times daily 6 See text below for discussion of interaction. St. John's wort (Hypericum perforatum, standardized to 0.3 % hypericin) 300 three times daily with meals, 14 days 800 three times daily 8 Not Available 0.46 (0.34, 0.58)95% CI. 0.19 (0.06, 0.33) Stavudine (d4T) 40 twice daily, 7 days 800 three times daily, 7 days 11 0.95 (0.80, 1.11) 0.95 (0.80, 1.12) 1.13 (0.83, 1.53) Trimethoprim/ Sulfamethoxazole 800 Trimethoprim/ 160 Sulfamethoxazole q12h, 7 days 400 four times daily, 7 days 12 1.12 (0.87, 1.46) 0.98 (0.81, 1.18) 0.83 (0.72, 0.95) Zidovudine 200 three times daily, 7 days 1000 three times daily, 7 days 12 1.06 (0.91, 1.25) 1.05 (0.86, 1.28) 1.02 (0.77, 1.35) Zidovudine/ Lamivudine (3TC) 200/150 three times daily, 7 days 800 three times daily, 7 days 6, 9Parallel group design; n for indinavir + coadministered drug, n for indinavir alone. 1.05 (0.83, 1.33) 1.04 (0.67, 1.61) 0.98 (0.56, 1.73) Table 3: Drug Interactions: Pharmacokinetic Parameters for Coadministered Drug in the Presence of Indinavir (See PRECAUTIONS, Table 9 for Recommended Alterations in Dose or Regimen) Coadministered drug Dose of Coadministered drug (mg) Dose of CRIXIVAN (mg) n Ratio (with/without CRIXIVAN) of Coadministered Drug Pharmacokinetic Parameters (90% CI); No Effect = 1.00 Cmax AUC Cmin All interaction studies conducted in healthy, HIV-negative adult subjects, unless otherwise indicated. Clarithromycin 500 twice daily, 7 days 800 three times daily, 7 days 12 1.19 (1.02, 1.39) 1.47 (1.30, 1.65) 1.97 (1.58, 2.46) n=11 Efavirenz 200 once daily, 14 days 800 three times daily, 14 days 20 No significant change No significant change -- Ethinyl Estradiol (ORTHO-NOVUM 1/35)Registered trademark of Ortho Pharmaceutical Corporation. 35 mcg, 8 days 800 three times daily, 8 days 18 1.02 (0.96, 1.09) 1.22 (1.15, 1.30) 1.37 (1.24, 1.51) Isoniazid 300 once daily in the morning, 8 days 800 three times daily, 8 days 11 1.34 (1.12, 1.60) 1.12 (1.03, 1.22) 1.00 (0.92, 1.08) MethadoneStudy conducted in subjects on methadone maintenance. 20-60 once daily in the morning, 8 days 800 three times daily, 8 days 12 0.93 (0.84, 1.03) 0.96 (0.86, 1.06) 1.06 (0.94, 1.19) Norethindrone (ORTHO-NOVUM 1/35) 1 mcg, 8 days 800 three times daily, 8 days 18 1.05 (0.95, 1.16) 1.26 (1.20, 1.31) 1.44 (1.32, 1.57) Rifabutin 150 mg once daily in the morning, 11 days + indinavir compared to 300 mg once daily in the morning, 11 days alone 150 once daily in the morning, 10 days 300 once daily in the morning, 10 days 800 three times daily, 10 days 800 three times daily, 10 days 14 10 1.29 (1.05, 1.59) 2.34 (1.64, 3.35) 1.54 (1.33, 1.79) 2.73 (1.99, 3.77) 1.99 (1.71, 2.31) n=13 3.44 (2.65, 4.46) n=9 Ritonavir 100 twice daily, 14 days 800 twice daily, 14 days 10, 4Parallel group design; n for coadministered drug + indinavir, n for coadministered drug alone. 1.61 (1.13, 2.29) 1.72 (1.20, 2.48) 1.62 (0.93, 2.85) 200 twice daily, 14 days 800 twice daily, 14 days 9, 5 1.19 (0.85, 1.66) 1.96 (1.39, 2.76) 4.71 (2.66, 8.33) n=9, 4 Saquinavir Hard gel formulation 600 single dose 800 three times daily, 2 days 6 4.7 (2.7, 8.1) 6.0 (4.0, 9.1) 2.9 (1.7, 4.7)C6hr Soft gel formulation 800 single dose 800 three times daily, 2 days 6 6.5 (4.7, 9.1) 7.2 (4.3, 11.9) 5.5 (2.2, 14.1) Soft gel formulation 1200 single dose 800 three times daily, 2 days 6 4.0 (2.7, 5.9) 4.6 (3.2, 6.7) 5.5 (3.7, 8.3) Sildenafil 25 single dose 800 three times daily 6 See text below for discussion of interaction. StavudineStudy conducted in HIV-positive subjects. 40 twice daily, 7 days 800 three times daily, 7 days 13 0.86 (0.73, 1.03) 1.21 (1.09, 1.33) Not Done Theophylline 250 single dose (on Days 1 and 7) 800 three times daily, 6 days (Days 2 to 7) 12, 4 0.88 (0.76, 1.03) 1.14 (1.04, 1.24) 1.13 (0.86, 1.49) n=7, 3 Trimethoprim/ Sulfamethoxazole Trimethoprim 800 Trimethoprim/ 160 Sulfamethoxazole q12h, 7 days 400 q6h, 7 days 12 1.18 (1.05, 1.32) 1.18 (1.05, 1.33) 1.18 (1.00, 1.39) Trimethoprim/ Sulfamethoxazole Sulfamethoxazole 800 Trimethoprim/ 160 Sulfamethoxazole q12h, 7 days 400 q6h, 7 days 12 1.01 (0.95, 1.08) 1.05 (1.01, 1.09) 1.05 (0.97, 1.14) Vardenafil 10 single dose 800 three times daily 18 See text below for discussion of interaction. Zidovudine 200 three times daily, 7 days 1000 three times daily, 7 days 12 0.89 (0.73, 1.09) 1.17 (1.07, 1.29) 1.51 (0.71, 3.20) n=4 Zidovudine/ Lamivudine Zidovudine 200/150 three times daily, 7 days 800 three times daily, 7 days 6, 7 1.23 (0.74, 2.03) 1.39 (1.02, 1.89) 1.08 (0.77, 1.50) n=5, 5 Zidovudine/ Lamivudine Lamivudine 200/150 three times daily, 7 days 800 three times daily, 7 days 6, 7 0.73 (0.52, 1.02) 0.91 (0.66, 1.26) 0.88 (0.59, 1.33) Delavirdine: Delavirdine inhibits the metabolism of indinavir such that coadministration of 400-mg or 600-mg indinavir three times daily with 400-mg delavirdine three times daily alters indinavir AUC, Cmax and Cmin (see Table 2). Indinavir had no effect on delavirdine pharmacokinetics (see DOSAGE AND ADMINISTRATION, Concomitant Therapy, Delavirdine), based on a comparison to historical delavirdine pharmacokinetic data. Methadone: Administration of indinavir (800 mg every 8 hours) with methadone (20 mg to 60 mg daily) for one week in subjects on methadone maintenance resulted in no change in methadone AUC. Based on a comparison to historical data, there was little or no change in indinavir AUC. Ritonavir: Compared to historical data in patients who received indinavir 800 mg every 8 hours alone, twice-daily coadministration to volunteers of indinavir 800 mg and ritonavir with food for two weeks resulted in a 2.7-fold increase of indinavir AUC24h, a 1.6-fold increase in indinavir Cmax, and an 11-fold increase in indinavir Cmin for a 100-mg ritonavir dose and a 3.6-fold increase of indinavir AUC24h, a 1.8- fold increase in indinavir Cmax, and a 24-fold increase in indinavir Cmin for a 200-mg ritonavir dose. In the same study, twice-daily coadministration of indinavir (800 mg) and ritonavir (100 or 200 mg) resulted in ritonavir AUC24h increases versus the same doses of ritonavir alone (see Table 3). Sildenafil: The results of one published study in HIV-infected men (n=6) indicated that coadministration of indinavir (800 mg every 8 hours chronically) with a single 25-mg dose of sildenafil resulted in an 11% increase in average AUC0-8hr of indinavir and a 48% increase in average indinavir peak concentration (Cmax) compared to 800 mg every 8 hours alone. Average sildenafil AUC was increased by 340% following coadministration of sildenafil and indinavir compared to historical data following administration of sildenafil alone (see CONTRAINDICATIONS, WARNINGS, Drug Interactions and PRECAUTIONS, Drug Interactions). Vardenafil: Indinavir (800 mg every 8 hours) coadministered with a single 10-mg dose of vardenafil resulted in a 16-fold increase in vardenafil AUC, a 7-fold increase in vardenafil Cmax, and a 2-fold increase in vardenafil half-life (see WARNINGS, Drug Interactions and PRECAUTIONS, Drug Interactions).

More information

Category Value
Authorisation number NDA020685
Orphan designation No
Product NDC 0006-0573,0006-0570,0006-0571
Date Last Revised 15-09-2016
Type HUMAN PRESCRIPTION DRUG
RXCUI 541058
Storage and handling Storage Bottles: Store in a tightly-closed container at room temperature, 15-30°C (59-86°F). Protect from moisture. CRIXIVAN Capsules are sensitive to moisture. CRIXIVAN should be dispensed and stored in the original container. The desiccant should remain in the original bottle.
Marketing authorisation holder Merck Sharp & Dohme Corp.