Pfizer Viagra 100mg Tablets: Strong Erectile Dysfunction Treatment UK Guide
Pfizer Viagra 100mg Tablets contain 100mg of sildenafil as sildenafil citrate, an active ingredient used to treat erectile dysfunction (ED) in adult men. Sildenafil belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. It works by increasing blood flow to the penis when a man is sexually stimulated, helping him achieve and maintain an erection suitable for sexual activity. Current UK product information identifies Viatris as the marketing authorisation holder for Viagra 100mg tablets, following Pfizer’s historical involvement with the brand.
Viagra 100mg is the highest recommended sildenafil dose for on-demand treatment of erectile dysfunction. It is not normally the starting dose; the usual recommended starting dose is 50mg, which may be adjusted according to effectiveness and tolerability. Sildenafil does not cause an erection without sexual stimulation and should be used according to the advice of a healthcare professional.
What Is Viagra 100mg Used For?
- Erectile Dysfunction: Viagra is indicated for adult men who have difficulty achieving or maintaining a penile erection sufficient for satisfactory sexual performance.
- Difficulty Achieving an Erection: Sildenafil can support the natural erectile response when sexual stimulation occurs by increasing blood flow to the penis.
- Difficulty Maintaining an Erection: Treatment can help men maintain an erection for satisfactory sexual activity when erectile dysfunction is the underlying cause.
- Sexual Performance Difficulties Related to ED: Viagra is intended for erectile dysfunction rather than general sexual enhancement and requires sexual stimulation to produce its effect.
How Does Viagra 100mg Work?
Viagra 100mg contains sildenafil, a selective PDE5 inhibitor. During sexual stimulation, nitric oxide signalling increases the production of cyclic guanosine monophosphate (cGMP) in penile tissue. Sildenafil inhibits the PDE5 enzyme, helping cGMP remain active for longer and supporting relaxation of smooth muscle and increased blood flow into the penis. This mechanism helps strengthen the natural erectile response, but sildenafil does not produce an automatic erection. Sexual stimulation is required for the medication to work.
How to Take Viagra 100mg
- Prescription and Medical Assessment: Viagra should be used according to the instructions provided by a prescriber or other appropriate healthcare professional. The suitability of sildenafil can depend on cardiovascular health, other medical conditions and interacting medicines.
- Recommended Starting Dose: The usual recommended adult dose of sildenafil for erectile dysfunction is 50mg taken as needed approximately one hour before sexual activity. Depending on effectiveness and tolerability, the dose may be increased to 100mg or reduced to 25mg.
- Viagra 100mg Dose: The 100mg strength is the maximum recommended sildenafil dose. It should not be taken more than once in a 24-hour period unless a healthcare professional has specifically advised otherwise.
- Timing Before Sexual Activity: Sildenafil is generally taken approximately one hour before sexual activity. The exact time it takes to work can vary between individuals.
- Food and Viagra: Sildenafil can be taken with or without food. However, taking it with a substantial meal may delay the onset of activity compared with taking it on an empty stomach.
- Sexual Stimulation: Viagra does not normally produce an erection without sexual stimulation. Sexual arousal is necessary for sildenafil to support the erectile response.
- Kidney or Liver Problems: People with significant kidney or liver impairment may require a lower starting dose because sildenafil clearance can be reduced. Dose selection should therefore be discussed with a healthcare professional.
- Missed Dose: Viagra is normally taken only when required for sexual activity, so there is no regular daily dose to make up if a dose is missed. Do not take an additional tablet simply because a previous dose was missed.
Viagra 100mg Side Effects
Like all medicines, Viagra can cause side effects, although not everyone experiences them. Commonly reported effects can include:
- Rash
- Nausea
- Headache
- Flushing
- Vomiting
- Dizziness
- Indigestion
- Muscle pain
- Nasal congestion
- Visual disturbances
Many common side effects are mild and may become less noticeable as the body adjusts to sildenafil. However, persistent, severe or concerning symptoms should be discussed with a healthcare professional.
Important Warnings and Precautions
- Nitrates and Nitric Oxide Donors: Sildenafil must not be taken with nitrates or nitric oxide donors because the combination can cause a potentially dangerous fall in blood pressure.
- Riociguat: Sildenafil is contraindicated with riociguat and other relevant guanylate cyclase stimulators because the combination can produce significant blood-pressure lowering.
- Heart and Cardiovascular Conditions: Men with cardiovascular disease or those who have been advised to avoid sexual activity should receive appropriate medical assessment before using sildenafil because sexual activity itself can place additional strain on the cardiovascular system.
- Blood Pressure Medicines and Alpha-Blockers: Sildenafil can lower blood pressure and may interact with medicines used to treat high blood pressure or prostate symptoms, including alpha-blockers. Medical advice is important when these treatments are used together.
- Other Medicines: Sildenafil is metabolised mainly through CYP3A4 and can interact with medicines that affect this enzyme. Certain HIV medicines, antifungal medicines, antibiotics and other treatments may increase sildenafil exposure and require medical review.
- Low Blood Pressure: Sildenafil may cause a reduction in blood pressure. People with significant low blood pressure or certain cardiovascular conditions may not be suitable for treatment.
- Eye Conditions: Men with a history of certain serious eye conditions or previous sudden vision loss should discuss sildenafil treatment with a healthcare professional before use.
- Alcohol: Drinking large amounts of alcohol can temporarily reduce the ability to achieve an erection and may make dizziness or low blood pressure more likely. Avoid excessive alcohol when using sildenafil.
- Driving and Machinery: Dizziness and visual disturbances can occur after taking sildenafil. Do not drive, cycle or operate machinery if these effects affect your ability to do so safely.
- Sexually Transmitted Infections: Viagra does not protect against sexually transmitted infections or pregnancy. Appropriate barrier contraception should be used where necessary.
Stopping Viagra Treatment
Sildenafil is normally taken on demand rather than as a continuous daily treatment, so gradual dose reduction is generally not required when stopping it. If you no longer need Viagra or experience side effects or other concerns, discuss continued treatment with your prescriber or pharmacist.
Frequently Asked Questions
How long does Viagra 100mg take to work?
Sildenafil is generally taken approximately one hour before sexual activity. The response can vary between individuals, and sexual stimulation is required for the medication to work. Taking sildenafil with a substantial meal may delay its onset.
Can Viagra 100mg cause an erection without sexual stimulation?
No. Sildenafil supports the natural erectile response when sexual stimulation occurs. It does not normally produce an erection without sexual arousal.
Can I take Viagra 100mg every day?
The maximum recommended dosing frequency for sildenafil is once per day. Viagra 100mg is intended for on-demand treatment of erectile dysfunction rather than routine multiple-dose use.
Is Viagra 100mg stronger than Viagra 50mg?
Viagra 100mg contains twice as much sildenafil as the 50mg strength and is the maximum recommended dose. However, 50mg is the usual starting dose, and increasing to 100mg should depend on effectiveness and tolerability rather than simply choosing the highest strength.
Can I take Viagra 100mg with nitrates?
No. Sildenafil must not be taken with nitrates or nitric oxide donors because the combination can cause a dangerous fall in blood pressure. This includes medicines commonly used to treat angina. Speak to a healthcare professional if you use any medication for chest pain before considering sildenafil.
Does Viagra 100mg protect against sexually transmitted infections?
No. Viagra treats erectile dysfunction and does not protect against sexually transmitted infections or pregnancy. Appropriate protection should be used during sexual activity where required.
