This article was reviewed by Kelly Brown MD, MBA. Whether you’re a senior in high school or a senior-living resident, you’ve likely heard of Viagra (sildenafil) — the original medication for ED.

But other nuances about how — and when — these medications should be taken will ultimately be very important when deciding which one is right for you. Is Cialis stronger than Viagra?

The main difference between Cialis and Viagra is how long each lasts. Cialis stays in your system for up to 36 hours, and you ...