The clinically established treatment for erectile dysfunction — now prescribed online, reviewed by licensed providers, and shipped discreetly from U.S. pharmacies.
For most men exploring treatment for the first time, sildenafil is the clinically sensible place to start — affordable, well-understood, and flexible.
One of the most prescribed and studied ED medications in the world, with a well-characterized profile.
As-needed dosing means no daily pill — ideal for spontaneity and trying treatment on your own terms.
The same active ingredient as Viagra® at a fraction of the brand price through 503A partner pharmacies.
Available in 25 mg, 50 mg, and 100 mg so your provider can dial in what works for your body.
Sildenafil inhibits the PDE5 enzyme, which normally breaks down the signal that allows an erection to form.
With PDE5 paused, blood vessels relax and circulation to the penis increases when you're aroused.
The result is a firmer erection that's easier to achieve and maintain — with natural arousal still required.
Sildenafil citrate is the generic form of Viagra® — the original PDE5 inhibitor approved for erectile dysfunction. As a generic, it contains the identical active ingredient to the brand at a far more accessible price.
It's intended for use as needed before sexual activity rather than on a daily schedule. Because it relies on natural arousal to work, sildenafil supports your body's own response rather than overriding it.
Start your visit →Available strengths — your provider selects the right starting dose:
Taking sildenafil with nitrate medications (often prescribed for chest pain or heart conditions) can cause a dangerous, life-threatening drop in blood pressure. Tell your provider about every medication you take.
Seek immediate care for an erection lasting more than 4 hours (priapism) or sudden vision/hearing changes.
A side-by-side look at the ED options available through ForbiddenRx. Your provider helps you choose what's right.
| Treatment | What it is | Onset | Duration | Form | Rx required |
|---|---|---|---|---|---|
| Sildenafil | Generic Viagra®, a PDE5 inhibitor | 30–60 min | 4–6 hours | Tablet | Yes |
| Tadalafil | Generic Cialis®, longer-acting PDE5 | 30–60 min | Up to 36 hours | Tablet | Yes |
| 3-in-1 Hard Mint | Compounded blend, dissolvable | 15–30 min | Varies | Troche / mint | Yes |
| Branded Viagra | Original brand-name sildenafil | 30–60 min | 4–6 hours | Tablet | Yes |
Treatment shouldn't get in the way of the moment. Sildenafil's as-needed format is built around your life, not the other way around.
This page was written and is periodically reviewed for medical accuracy in line with clinical guidance followed by the independent, licensed medical providers in the ForbiddenRx network. It is provided for general educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always talk with a licensed provider about your individual health. Last reviewed: July 2026.
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