Who Cannot Take Viagra: Complete Safety Guide
Absolute Contraindications
Certain medical conditions make Viagra completely unsuitable. Men taking nitrates (GTN spray, isosorbide tablets) must never use Viagra due to dangerous blood pressure drops that could prove fatal. Similarly, those on riociguat for pulmonary hypertension face serious interactions. Severe heart disease, recent heart attacks or strokes within six months, and severe liver impairment also preclude Viagra use.
Cardiovascular Warnings
Viagra affects blood pressure and heart function, making cardiovascular assessment essential. Men with uncontrolled high blood pressure, very low blood pressure, or unstable angina require careful evaluation. The medication may not be suitable for those with certain heart rhythm disorders or severe heart failure. Sexual activity itself carries cardiovascular risks, which prescribers must consider alongside Viagra's effects.
Critical Drug Interactions
Beyond nitrates, several medications interact dangerously with Viagra. Alpha-blockers for prostate problems can cause severe blood pressure drops when combined with sildenafil. HIV protease inhibitors and certain antifungals significantly increase Viagra levels in the blood, requiring dose adjustments. Blood pressure medications may need monitoring when starting Viagra treatment.
Age-Related Considerations
Men over 65 may process Viagra more slowly, potentially requiring lower starting doses. Kidney or liver function naturally declines with age, affecting how the body handles sildenafil. Older patients often take multiple medications, increasing interaction risks. Regular medication reviews become crucial for safe ongoing treatment.
Vision and Hearing Warnings
Rare but serious side effects include sudden vision or hearing loss. Men with hereditary eye conditions like retinitis pigmentosa face increased risks. Any sudden changes in vision or hearing during treatment require immediate medical attention. Previous episodes of non-arteritic anterior ischaemic optic neuropathy (NAION) may contraindicate Viagra use.
Dosing Safety Guidelines
Never exceed one dose per 24 hours, regardless of effectiveness. Starting doses typically begin at 50mg, adjustable to 25mg or 100mg based on response and tolerability. Fatty meals can delay onset, but timing adjustments are preferable to dose increases. Alcohol consumption should be moderate as it may worsen side effects and reduce effectiveness.
Emergency Situations
Priapism (erections lasting over four hours) requires immediate emergency treatment to prevent permanent damage. Severe allergic reactions, though rare, need urgent medical attention. Chest pain during sexual activity whilst on Viagra requires emergency assessment - never use nitrates without medical supervision.
Treatment Options at EverydayMeds
EverydayMeds offers both branded Viagra and generic sildenafil following comprehensive clinical assessment. Patients can choose between branded or generic options at checkout, with sildenafil providing the same active ingredient at lower cost. All treatments require prescription following consultation with UK-licensed prescribers who evaluate individual suitability and safety.
