Can I take Cardizem and Cialis together?

Patient: I take 180mg of Cardizem LA, daily, for mild a-fib. Can I take Cialis?

Doctor: Cardizem can prolong and/or increase the effect of Cialis. This is considered a moderate drug interaction, not a seriou us one but you should still be cautious. If you will decide to take both, symptoms to watch out for are chest tightness, shortness of breath, visual disturbances, fainting, nausea, irregular heart beat and prolonged erection (more than 4 hours). I do hope this helps and take care always.