Both Stendra and Viagra are FDA-approved medications used to treat erectile dysfunction in men. The active ingredient in Viagra is sildenafil and the active ingredient in Stendra is avanafil. While Viagra and Stendra work in similar ways, the mechanism of action is slightly different. As with all medications, results will vary, so you might find that one medication works better for you than the other.
Both medications start working in approximately 30 minutes. Stendra lasts about 6 hours, slightly longer than Viagra, which only lasts 4 hours. Stendra and Viagra both have similar side effects, including headaches, flushed skin, digestive upset, and nasal congestion.
Before prescribing Viagra or Stendra, your physician will review your medical history and help you pick a medication and dosage. Regardless of other factors, the biggest difference between Viagra and Stendra might be how well it works for you.