You should also call your insurance company to see if they cover erectile dysfunction medications. More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. We also looked at additional services, such as access to digital pharmacies and home delivery options. You take one 2. Insurance can help you save even more on consultations and medications. They have the same benefits and risks as their brand-name counterparts.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is mg. Don’t take sildenafil (Viagra) more than once daily (at any dose). Written by Brian Leonard, PharmD, BCACP, BCGP. Brand names for sildenafil include Viagra, Revatio, and Liqrev. The cost for sildenafil oral tablet mg is around $10 for a supply of 2 tablets, depending on the pharmacy you visit. Quoted prices are for cash-paying customers and are not valid with insurance plans. Brand Names: Revatio, Viagra Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Learn more about sildenafil oral. 1 Sildenafil is used to.