PRECAUTIONS Large doses of caffeine may produce headache, excitement, agitation, a condition resembling anxiety neurosis, scintillating scotoma, hyperesthesia, tinnitus, muscle tremors or twitches, diuresis, tachycardia, extrasystoles, and other cardiac arrhythmias. Further CNS depression may occur when already depressed patients are too vigorously treated with Caffeine and Sodium Benzoate Injection. Caffeine and other xanthines may enhance the cardiac inotropic effects of ß-adrenergic stimulating agents. Caffeine has also been reported to increase its own metabolism and that of other drugs, including phenobarbital and aspirin. Caffeine produces false-positive elevations of serum urate as measured by the Bittner method. The drug also produces slight increases in urine levels of vanilamandelic acid (VMA), catecholamines, and 5-hydrocyindoleacetic acid. Because high urine levels of VMA or catecholamines may result in false-positive diagnosis of pheochromocytoma or neuroblastoma, caffeine intake should be avoided during tests for these disorders. Pregnancy Teratogenic Effects Pregnancy Category C. Animal reproduction studies have not been conducted with Caffeine and Sodium Benzoate Injection. It is also not known whether Caffeine and Sodium Benzoate Injection can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Caffeine and Sodium Benzoate Injection should be given to a pregnant woman only if clearly needed.