This increase in blood flow results in a firmer, longer-lasting erection. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. Finding an online ED provider can feel overwhelming. Those with a history of blood pressure or heart issues, hormonal imbalances, mental health issues, and diabetes should consult their doctor before trying PDE5 inhibitors. There are many safe, reliable online services offering ED prescriptions.According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with . VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Patients should always ask their doctors for medical advice about adverse events. You are . Viagra. Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $