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Like most of these types of medications, this ED drug works by increasing blood flow to the penis to help men achieve and maintain their erections. Cialis contains tadalafil whereas Viagra contains sildenafil. Both increases blood flow to the penis enabling firmer erections.

If you are taking sildenafil (Liqrev, Revatio) for PAH, do not stop taking your medication until you talk to your doctor. There have been reports of heart attack, stroke, irregular heartbeat, bleeding in the brain or lungs, high blood pressure, and sudden death in men who took sildenafil for erectile dysfunction. Most, but not all, of these people had heart problems before taking sildenafil. It is not known whether these events were caused by sildenafil, sexual activity, heart disease, or a combination of these and other causes.Talk to your doctor about the risks of taking sildenafil. Cialis' active ingredient (tadalafil) increases blood flow to the penis.

If you only use Cialis as required for ED, it doesn't matter if you skip a dose. For those who&nbsp