Some men get side effects from using Viagra, but most of the time these are mild and disappear after a couple of uses. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety. During the pandemic, rules prohibiting providers from prescribing these types of drugs without seeing a patient in person were waived. But this drug is in no way similar to sildenafil and works in a completely different way. Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder. Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours.If you’re looking for a less costly Viagra, you might want to ask your doctor about sildenafil. It’s the active ingredient in both branded Viagra and the drug Revatio, which is a lower . For ED, Viagra is the first port of call. It’s been used by millions of men for over 20 years, and works by boosting circulation to the penis. We’re here to help you find the ED . Get a Savings Card Sign up for a Savings Card and, if eligible, you may save 50% on up to 12 prescriptions of brand-name VIAGRA per year.* * Terms and conditions apply. Check .