Head-to-head comparisons of medication uses, side effects, warnings, and more.
Key takeaways
Tadalafil (Cialis) and avanafil (Stendra) are both medications used to treat erectile dysfunction (ED) and belong to the same drug class, phosphodiesterase-5 (PDE-5) inhibitors. However, they have several differences. Tadalafil (Cialis) is also FDA-approved for treating benign prostatic hyperplasia (BPH), while avanafil (Stendra) is only approved for ED. Tadalafil can be taken either as needed or daily, with effects lasting up to 36 hours, whereas avanafil is taken as needed and lasts up to 6 hours. Both medications are available as lower-cost generics. Common side effects of both medications include headache, flushing, and indigestion. Both medications can cause dangerously low blood pressure if taken with nitrates or certain other medications, so it's important to discuss all your medications with your healthcare provider.