Duration of Action and Eligibility Requirements
How Long Viagra Remains Effective
Viagra (sildenafil citrate) typically remains active in your system for 4-6 hours after taking a dose. However, this doesn't mean you'll maintain an erection for this entire period. The medication works by improving blood flow to the penis when you become sexually aroused, helping you achieve and maintain an erection during this timeframe.
The onset of action usually occurs within 30-60 minutes of taking the tablet on an empty stomach. Fatty meals may delay how quickly Viagra starts working, so it's often recommended to take it when you haven't eaten a large meal recently. Most men find the effects gradually diminish after the 4-6 hour window.
Who Can Take Viagra
Viagra is suitable for adult men aged 18 and over who experience erectile dysfunction. At EverydayMeds, all patients must complete a clinical assessment with our UK-licensed prescribers before starting treatment. This ensures the medication is safe and appropriate for your individual circumstances.
Our clinical assessment evaluates your cardiovascular health, current medications, and medical history. This is particularly important because Viagra affects blood pressure and can interact with certain medications. The consultation process helps determine the most suitable starting dose, typically 50mg, which can be adjusted to 25mg or 100mg based on effectiveness and tolerability.
Who Should Not Take Viagra
Certain individuals cannot safely take Viagra due to serious health risks. You should not take this medication if you're currently using nitrates such as GTN spray or isosorbide tablets for chest pain, as this combination can cause dangerous drops in blood pressure.
Other contraindications include severe heart disease, recent heart attack or stroke within the past six months, severe liver problems, very low blood pressure, or hereditary eye conditions affecting the retina. Men taking riociguat for pulmonary hypertension should also avoid Viagra due to potentially dangerous interactions.
Branded Viagra vs Generic Sildenafil
EverydayMeds offers both branded Viagra and generic sildenafil options at checkout. Both contain the same active ingredient (sildenafil citrate) and work identically in terms of effectiveness and duration. The main difference is cost, with generic sildenafil typically being more affordable whilst providing the same therapeutic benefits.
Whether you choose branded Viagra or generic sildenafil, you can expect the same 4-6 hour duration of action and similar onset times. Both options require the same clinical assessment and are prescribed following the same safety protocols by our qualified healthcare professionals.
Safety Considerations and Monitoring
Regular monitoring may be recommended for some patients, particularly those with underlying health conditions or taking multiple medications. Common side effects can include headaches, flushing, nasal congestion, and mild digestive issues, though these typically resolve as your body adjusts to the medication.
It's important to never exceed one dose within 24 hours and to seek immediate medical attention if you experience an erection lasting longer than four hours, sudden vision changes, or chest pain during sexual activity. Our clinical team provides comprehensive safety guidance tailored to your individual health profile.
