Sildenafil: UK Information Guide

Introduction

Sildenafil is the active ingredient in a group of medicines used to treat erectile dysfunction in adult men. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It is used to help men who have difficulty achieving or maintaining an erection sufficient for sexual activity. This UK-focused guide explains what Sildenafil is, how it works, how it is usually taken, common and serious side effects, safety points, and frequently asked questions. It is general information only — not personal medical advice.

What Is Sildenafil?

Sildenafil is the active ingredient in a group of medicines used to treat erectile dysfunction in adult men. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It is used to help men who have difficulty achieving or maintaining an erection sufficient for sexual activity.

It is the generic equivalent of the originally branded medicine Viagra. Popular generic products include Cenforce 100mg, Kamagra 100mg, Fildena 100 and SILDAMAX 100mg.

How Does It Work?

Sildenafil works by blocking the PDE5 enzyme, which allows levels of cyclic guanosine monophosphate (cGMP) to rise in the tissues of the penis. This helps relax the blood vessels and improve blood flow when a man is sexually stimulated. Sexual arousal is still needed; it does not cause an erection on its own. It generally begins to work within roughly 30–60 minutes and its effect usually lasts for a few hours (typically around 4 hours).

How Is It Usually Taken?

Sildenafil is normally taken by mouth a short time before planned sexual activity, at the dose advised by your doctor. It can be taken with or without food, although a heavy or high-fat meal may delay onset. As a general rule no more than one dose should be taken in any 24-hour period. Always follow the patient information leaflet and professional advice.

Possible Side Effects

Like all medicines, products containing this active ingredient can cause side effects, although not everyone experiences them.

More commonly reported effects can include:

• Headache
• Flushing of the face
• Indigestion or stomach upset
• Nasal congestion (blocked or runny nose)
• Dizziness
• Changes in vision such as a blue tinge or blurring

Serious effects require urgent medical attention. Stop and seek help immediately if you experience:

• A painful erection lasting longer than 4 hours (priapism) — seek urgent medical help
• Sudden loss or decrease in vision in one or both eyes
• Sudden loss or reduction in hearing, sometimes with ringing in the ears
• Chest pain during or after sexual activity
• Signs of a serious allergic reaction such as swelling of the face, lips or throat, rash or difficulty breathing

This is not a complete list. Always read the patient information leaflet and report concerns to a doctor, pharmacist or via the MHRA Yellow Card scheme.

Important Safety Information

1. Must NOT be taken with nitrate medicines (used for chest pain/angina) or nitric-oxide donors such as amyl nitrite “poppers”, as this can cause a dangerous drop in blood pressure.
2. Use with caution if you have heart or blood-vessel disease, or if sexual activity has been advised against for heart reasons.
3. Tell your doctor about any liver or kidney problems, as a dose adjustment may be needed.
4. Caution is needed if you have low blood pressure or take alpha-blockers or other blood-pressure-lowering medicines.
5. Drinking alcohol can lower blood pressure further and may reduce the medicine’s effectiveness.
6. Grapefruit and grapefruit juice may affect how the medicine works and are best avoided.
7. Not intended for use by women, children or anyone under 18 years of age.

Storage

Store in the original packaging below 30°C, out of the sight and reach of children, and do not use after the expiry date.

Related Products

The following products contain this active ingredient (or related combinations). This list is for neutral navigation only and does not imply suitability for any individual.

• Cenforce 100mg — generic sildenafil, common middle strength
• Kamagra 100mg — generic sildenafil, tablets and jelly formats
• Fildena 100 — generic sildenafil
• SILDAMAX 100mg — generic sildenafil
• Cenforce D — sildenafil + dapoxetine combination

Final Takeaway

Sildenafil is a real medicine with specific uses, benefits and risks. Key points are medical assessment before use, awareness of side effects and interactions, and reading the official patient information leaflet. This article is for general information only and does not replace advice from a doctor or pharmacist.

This article is general information, not medical advice. Always consult a healthcare professional before starting any medication. Always read the patient information leaflet.