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Sildenafil
From: £5.99
Or £5.39 / month
Viagra is the original branded ED treatment manufactured by Pfizer. It contains sildenafil citrate and works within 30–60 minutes, lasting 4–6 hours. Available in 25mg, 50mg and 100mg. Clinically identical to generic Sildenafil — preferred by men who value the reassurance of the original brand
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Additional information
| Strength | 100mg, 25mg, 50mg |
|---|---|
| Quantity | 16, 20, 24, 32, 4, 64, 8 |
Overview
Content Written by:
Hanifa Tai
Hanifa Tai
Role: Pharmacist & Content Writer
GPhC Number: 2074961
Content Published: 01/04/2026
Next Review: 01/04/2027
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Description
What Is Viagra?
Viagra is the original prescription medicine for erectile dysfunction, first approved over 25 years ago. It contains the active ingredient sildenafil citrate and belongs to the PDE5 inhibitor class. It is manufactured by Pfizer, the company that originally developed it. Viagra enhances blood flow to the penis during sexual stimulation, helping to achieve and maintain an erection. Sexual arousal is always required.
How Does It Work?
During sexual stimulation, nitric oxide is released in the penis triggering production of cyclic GMP, which relaxes smooth muscle and widens blood vessels. An enzyme called PDE5 breaks down cyclic GMP. Viagra temporarily blocks this enzyme, allowing improved blood flow and stronger erections during arousal. It does not increase sexual desire or alter testosterone levels.
Dosing & How to Take
Available in 25mg, 50mg and 100mg. The usual starting dose is 50mg. Take 30–60 minutes before sexual activity. Swallow whole with water. Can be taken with or without food, but high-fat meals may slow absorption and delay effect. Maximum one tablet per 24-hour period.
How Effective Is Viagra?
Viagra has an extensive evidence base from clinical trials showing significant improvement in erection quality in the majority of men. Some men require a few attempts before achieving optimal results. If Viagra does not provide sufficient improvement, a pharmacist may adjust the dose or recommend an alternative such as Tadalafil.
Viagra vs Generic Sildenafil
Viagra and generic Sildenafil contain the same active ingredient at the same strengths. They are clinically identical in terms of safety and effectiveness. The differences are branding, packaging and price. Both are equally effective when sourced from a regulated UK pharmacy. Choice is a personal preference.
FAQ
Q: How quickly does Viagra work?
A: Viagra typically begins working within 30 to 60 minutes. Taking it on a lighter stomach, without a heavy meal, can speed onset.
Q: How long does Viagra last?
A: Effects usually last around 4 to 6 hours, depending on the individual.
Q: Is Viagra safe for long-term use?
A: Viagra has been used worldwide for over two decades. Its long-term safety profile is well established when used appropriately. It is not addictive and does not cause physical dependence.
Q: What is the maximum dose of Viagra?
A: The maximum recommended dose is 100mg in any 24-hour period.
Q: Can I take Viagra with alcohol?
A: Moderate alcohol is unlikely to significantly affect Viagra. Excessive alcohol can impair erections independently and increase dizziness risk. Limit alcohol when planning to use Viagra.
Side Effects
Common Side Effects
These are usually mild and resolve as the medicine leaves the body:
- Headache
- Facial flushing
- Nasal congestion
- Indigestion
- Dizziness
- Temporary visual disturbances (e.g. blue tinge to vision)
Rare but Serious Side Effects — Seek Urgent Medical Attention
- Chest pain — seek urgent medical help
- Sudden loss of vision — seek urgent medical help
- Sudden hearing loss — seek urgent medical help
- Erection lasting longer than 4 hours (priapism) — seek urgent medical help
Do Not Take If You:
- Use nitrate medication or nitric oxide donors
- Have been advised to avoid sexual activity due to heart disease
- Have severe low blood pressure
- Have recently had a heart attack or stroke
- Have certain rare inherited eye conditions
Cardiovascular Note: Sexual activity places moderate physical strain on the cardiovascular system. If you can climb two flights of stairs without chest pain or severe breathlessness, sexual activity is generally considered safe. Men with unstable heart disease should be assessed before treatment.
