Complete Sildenafil Quick Reference Information
Dosage and Administration Quick Facts
Sildenafil is available in three strengths: 25mg, 50mg, and 100mg tablets. The standard starting dose is 50mg, taken approximately 30-60 minutes before anticipated sexual activity. Based on effectiveness and tolerability, your prescriber may adjust the dose to 25mg if side effects occur, or increase to 100mg if the response is insufficient. The maximum dosing frequency is once per 24-hour period, regardless of strength.
For optimal effectiveness, sildenafil can be taken with or without food. However, high-fat meals may delay the onset of action, so taking on an empty stomach or after a light meal typically provides faster results. The medication requires sexual stimulation to work effectively and does not cause automatic erections.
Timing and Duration Facts
Sildenafil typically begins working within 30-60 minutes of administration, though this can vary between individuals. The effects can last up to 4-6 hours, providing a window during which achieving an erection may be easier when sexually aroused. It's important to understand that this duration refers to the medication's presence in your system, not the length of any erection.
Some men may find the medication works faster on subsequent uses as their body becomes accustomed to it. The timing can be affected by factors including age, overall health, other medications, alcohol consumption, and food intake.
Critical Drug Interaction Information
The most dangerous interaction occurs with nitrate medications, including GTN spray, isosorbide mononitrate, and recreational substances containing nitrates ("poppers"). This combination can cause a severe, potentially life-threatening drop in blood pressure. Always inform your prescriber about all medications you're taking, including over-the-counter remedies and supplements.
Alpha-blockers used for prostate conditions or blood pressure may also interact with sildenafil, potentially causing dizziness or fainting. If you're prescribed both types of medication, your prescriber will provide specific guidance about timing and monitoring. Grapefruit juice should be avoided as it can increase sildenafil levels in your blood.
Common Side Effects Quick Reference
The most frequently reported side effect is headache, experienced by more than 1 in 10 men. Other common effects include facial flushing, indigestion, nasal congestion, dizziness, and temporary visual changes such as increased sensitivity to light or a blue colour tinge to vision. These effects are generally mild and temporary, often diminishing with continued use.
Most side effects resolve within a few hours as the medication clears from your system. Staying hydrated and avoiding alcohol can help minimise some effects. If side effects are persistent or particularly bothersome, your prescriber may recommend adjusting the dose.
When to Seek Immediate Medical Help
Certain rare but serious side effects require emergency medical attention. Priapism, an erection lasting more than four hours, is a medical emergency that can cause permanent damage if not treated promptly. Sudden vision or hearing loss, chest pain during sexual activity, or signs of severe allergic reaction (difficulty breathing, swelling, severe rash) also require immediate medical care.
Any chest pain or discomfort during sexual activity should be taken seriously, as it may indicate underlying cardiovascular issues. Stop activity immediately and seek medical help if this occurs.
Prescription and Availability Facts
Sildenafil is a prescription-only medicine requiring consultation with a UK-registered prescriber. At EverydayMeds, our clinical assessment evaluates your suitability for treatment, considering your medical history, current medications, and overall cardiovascular health. This ensures safe prescribing and identifies any potential contraindications.
Patients can choose between generic sildenafil and branded Viagra during checkout, as both contain the same active ingredient but differ in cost. The generic version offers identical effectiveness and safety profile while providing significant cost savings for many patients.
