Explainer
Sildenafil online: how prescription ED treatment works
Reviewed by the FaroRx clinical team · Updated September 2026
The short answer
Sildenafil is the generic form of Viagra. It relaxes blood vessels in the penis so that arousal produces an erection, working within 30–60 minutes and lasting around four hours. It requires a prescription: you complete an online intake, a licensed provider reviews it, and the medication ships discreetly. FaroRx sildenafil starts at $69 per month.
How the online process works
- Complete a medical intake — about three minutes.
- A provider licensed in your state reviews your history and medications.
- If appropriate, a prescription goes to a licensed U.S. pharmacy.
- Discreet packaging ships to your door with free shipping.
What to know before taking it
- Never combine sildenafil with nitrates — the blood pressure drop can be dangerous.
- A heavy or high-fat meal delays onset.
- It requires arousal to work; it does not create desire.
- Common side effects: headache, flushing, nasal congestion, indigestion.
The FaroRx safety note
FaroRx medications are prescription-only. A licensed provider reviews your intake, medical history and medication list before anything is prescribed, and can decline if a treatment is not appropriate for you. Nothing here is medical advice.
Treatments mentioned
Common questions
How long does sildenafil take to work?
Typically 30–60 minutes, and longer after a heavy meal.
Do I need to see a doctor in person?
No. A licensed provider reviews your intake online and prescribes if appropriate.
How much does sildenafil cost at FaroRx?
From $69 per month, including provider review and free discreet shipping.
Start your ED visit
Complete a short online visit and a licensed provider will review whether treatment is right for you.
This guide is for information only and is not medical advice. Compounded medications are prepared by a licensed U.S. pharmacy and are not FDA-approved products.