Duration of Effects and Eligibility Requirements
How Long Do Viagra's Effects Last?
Viagra's effects typically last between 4 to 6 hours after taking the tablet. This timeframe represents how long the medication remains active in your system, not how long an erection will last. The medication works by increasing blood flow to the penis when you become sexually aroused during this period. It's important to understand that Viagra doesn't cause automatic erections - sexual stimulation is still required for the medication to work effectively.
Who Can Take Viagra?
Viagra is prescribed for adult men aged 18 and over who experience erectile dysfunction. To be eligible, you must complete a clinical assessment with a UK-licensed prescriber who will evaluate your medical history, current medications, and overall cardiovascular health. The assessment ensures Viagra is safe and appropriate for your individual circumstances.
At EverydayMeds, patients can choose between branded Viagra and generic sildenafil during checkout. Both contain the same active ingredient (sildenafil citrate) and work identically, with sildenafil offering a more cost-effective option whilst maintaining the same clinical effectiveness.
Medical Conditions That May Affect Eligibility
Certain medical conditions require careful consideration before prescribing Viagra. Men with well-controlled diabetes, mild to moderate high blood pressure, or previous heart problems may still be eligible following thorough assessment. However, those with severe cardiovascular disease, recent heart attacks or strokes (within six months), or severe liver impairment are typically not suitable candidates for this medication.
Contraindications and Safety Considerations
Viagra is absolutely contraindicated for men taking nitrate medications such as GTN sprays or isosorbide tablets, as this combination can cause dangerous drops in blood pressure. Other contraindications include severe heart disease, very low blood pressure, recent stroke or heart attack, and certain rare eye conditions affecting the retina.
The medication is also not recommended for those taking certain other medications that can interact dangerously, including some HIV protease inhibitors and specific antifungal medications. During your consultation, it's crucial to disclose all medications, supplements, and recreational substances you're using.
Starting Treatment and Dosage Considerations
Most men start with a 50mg dose of sildenafil, taken approximately one hour before sexual activity. Depending on effectiveness and any side effects experienced, the dose may be adjusted to 25mg or increased to 100mg. Only one tablet should be taken within any 24-hour period, regardless of the strength prescribed.
The medication should be taken on an empty stomach or after a light meal for optimal effectiveness. Heavy or fatty meals can delay the onset of action, potentially reducing the medication's effectiveness during your intended timeframe.
