It’s available in 50 mg, mg, and mg tablets. Privacy: Confirm that your personal data and payment details are confidential. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. The products discussed in this site may have different product labeling in different countries. Finding an online ED provider can feel overwhelming. Insurance: If you plan to use insurance, make sure the online provider accepts it. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire.The maximum dose of Viagra is mg each day. Doses above the maximum dose, such as mg per day, will increase the risk of side effects. And in some cases, this could be serious. Best Low Cost: GoodRx Fastest Delivery: Blink Health: Sesame Sign Up Now Key Specs Cost: Consultation prices vary based on the prescriber; $5 generic prescriptions Medical . Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour.