Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. Some services offer a subscription option where they’ll send your medications every month at a discount. However, some states require a live video consultation. The generic versions are just as effective and much less expensive. Shipping: Discreet, fast shipping is a must. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax.Los medicamentos orales para la disfuncion erectil generalmente son eficaces y tienen pocos efectos secundarios. Los cuatro medicamentos principales para la disfuncion erectil que se toman por boca son los siguientes: Avanafilo (Stendra) Sildenafilo (Viagra) Tadalafilo (Cialis) Vardenafilo. Estos medicamentos se denominan inhibidores . 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. Generic Viagra (sildenafil): $4 per 25 mg pill, $6 per 50 mg pill, $10 per mg pill; Branded Viagra: $90 per 25 mg, 50 mg, or mg pill; Generic Cialis (tadalafil): .