Surgery : Nitrocine is indicated for: 1. the rapid control of hypertension during cardiac surgery. 2. reducing blood pressure and maintaining controlled hypotension during surgical procedures. 3. controlling myocardial ischaemia during and after cardiovascular surgery. Unresponsive congestive heart failure: Nitrocine may be used to treat unresponsive congestive heart failure secondary to acute myocardial infarction. Unstable angina: Nitrocine may be used to treat unstable angina, which is refractory to treatment with beta blockers and sublingual nitrates.