Viagra Eligibility Criteria and Safety Requirements
Who Can Take Viagra Safely?
Viagra (sildenafil) is available for adult men aged 18 and over who have been diagnosed with erectile dysfunction. At EverydayMeds, patients can choose between branded Viagra or the generic sildenafil option during checkout - both contain the same active ingredient but the generic version offers a more affordable alternative.
To determine eligibility, a comprehensive clinical assessment must be completed with a UK-licensed prescriber. This evaluation examines your cardiovascular health, current medications, medical history, and any underlying conditions that might affect the safety or effectiveness of treatment.
Medical Conditions That May Affect Eligibility
Certain medical conditions require careful consideration before prescribing Viagra. Men with stable cardiovascular disease may still be eligible, but those with severe heart conditions, recent heart attack or stroke (within six months), or very low blood pressure may not be suitable candidates.
Liver impairment can affect how the body processes sildenafil, so dose adjustments or alternative treatments may be necessary for men with hepatic conditions. Similarly, severe kidney disease may require dosage modifications to ensure safe use.
Critical Drug Interactions to Avoid
The most dangerous interaction occurs between Viagra and nitrate medications, including GTN spray, isosorbide mononitrate, or any form of glyceryl trinitrate. This combination can cause a potentially life-threatening drop in blood pressure and must be avoided completely.
Other medications that may interact include certain blood pressure treatments, some antifungal medications, HIV protease inhibitors, and alpha-blockers used for prostate conditions. Always disclose all current medications during your consultation to ensure safe prescribing.
Optimal Timing and Usage Guidelines
When approved for treatment, Viagra should be taken 30-60 minutes before planned sexual activity. The medication works by increasing blood flow to the penis when sexually aroused - it does not cause automatic erections and sexual stimulation is still required.
Effects typically last 4-6 hours, though this does not mean an erection will persist for this duration. Only one dose should be taken within a 24-hour period, and fatty meals may delay the onset of action.
Starting Doses and Adjustments
Most men begin with a 50mg dose, which can be adjusted to 25mg if side effects occur, or increased to 100mg if the initial dose proves insufficient. Your prescriber will recommend the most appropriate starting dose based on your individual circumstances, age, and any other medications you may be taking.
Both Viagra and generic sildenafil are available in 25mg, 50mg, and 100mg strengths, allowing for flexible dosing to meet individual needs whilst maintaining safety.
