I have been using viagra, recently had angiogram a stent inserted in artery, given the following medication 1. aspirin 2. clopidogrel 3.bisoprolol fumarate 1/2 of 2.5 mg tablet 4. atorvasttin (40 mg) Can I continue using viagra if so, how soon can I take this pills, 3 months later ? Appreciate your advise, Thany you.