There are also network and mail-order pharmacies that work with health insurance companies to manage larger drug orders and keep pricing down for insurers. Some pharmacies, however, don’t have actual locations where you can walk in and hand over your prescription and your money to make a purchase. Now, the Drug Enforcement Agency DEA has proposed new rules that will require an in-person visit for anything more than a day supply of controlled substances to be filled by an online pharmacy. That depends on the online pharmacy and is changing. Just be sure you use the correct address to access their prescription capabilities. There are many safe, reliable online services offering ED prescriptions. Getting medication from them could be dangerous and costly because the medication might be fake, diluted, or out-of-date.Price without insurance: starts at $6 per dose for 10 doses. Doses: 20, 25, 50, and mg. Supply: 30, 90, or days. Sildenafil is the generic form of Viagra and Revatio. It’s chemically. $ retail Save 94% $ Get free savings Low price Walgreens $ retail Save 94% $ Get free savings directions Closest store Rite Aid.  · For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed.