Sildenafil Teva
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Understanding sildenafil side effects helps you use this erectile dysfunction treatment safely. This comprehensive guide covers common and serious side effects, when to seek medical help, and important safety information. EverydayMeds offers both generic sildenafil and branded Viagra options, allowing you to choose the most suitable treatment following your online consultation with our UK-licensed prescribers.
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When PDE5 is suppressed, blood is able to flow more freely through the body—including to the (you guessed it) penis.

More blood flow to the penis means harder, more satisfying erections once you're sexually stimulated.
Most men taking sildenafil experience mild side effects that often improve over time. Headaches affect around 16% of users and typically occur because sildenafil widens blood vessels throughout the body. Facial flushing happens in about 10% of men, causing temporary redness in the face, neck, or chest area. Indigestion and stomach upset may occur, particularly if taken with large or fatty meals.
Nasal congestion affects approximately 4% of users, whilst dizziness occurs in about 2% of men, usually within the first hour after taking the medication. These common side effects are generally mild and temporary, lasting 2-4 hours as the medication processes through your system.
Whilst rare, some side effects require urgent medical care. Seek immediate help if you experience chest pain, irregular heartbeat, or breathing difficulties, as these may indicate cardiovascular complications. Sudden vision loss or significant vision changes, though affecting less than 1% of users, require emergency medical assessment.
Priapism - an erection lasting more than 4 hours - occurs in fewer than 1 in 1000 men but constitutes a medical emergency requiring immediate treatment. Sudden hearing loss or severe allergic reactions including swelling of face, lips, or throat also warrant urgent medical attention.
Several strategies may help reduce side effects. Taking sildenafil on an empty stomach or with a light meal can minimise indigestion. Staying well-hydrated may help prevent headaches, whilst avoiding alcohol can reduce the risk of dizziness and flushing. If headaches persist, paracetamol is generally safe to use alongside sildenafil.
Your prescriber may adjust your dose if side effects are troublesome. Starting with 25mg rather than 50mg can help your body adjust gradually. Both generic sildenafil and branded Viagra contain the same active ingredient, so switching between them won't affect side effects.
Never take sildenafil with nitrate medications including GTN spray, as this combination can cause dangerous drops in blood pressure. Alpha-blockers for prostate problems may also interact, requiring careful dose timing. Always inform your prescriber about all medications, including over-the-counter medicines and supplements.
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