Consult your healthcare provider for more information about interactions and how they may affect you. This medication is taken with or without food an hour before sex. Cialis is not recommended for people taking any form of nitroglycerin because the combination may lower blood pressure to an unsafe level. Tadalafil comes as a tablet to take by mouth. This is a serious condition that requires immediate medical attention.Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether you have insurance, your . There are many ways to save on Cialis, which is available as both a brand-name and generic medication. Save with GoodRx. GoodRx can help you save over 97% off the . Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be.