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Headaches are one of the most common side effects of Viagra and sildenafil, affecting up to 16% of users. Understanding why they occur and how to manage them effectively can help you continue your ED treatment with confidence. EverydayMeds offers both branded Viagra and generic sildenafil options, with expert guidance on minimising side effects through our UK-licensed prescriber consultations.
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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.
Headaches occur because sildenafil (the active ingredient in both Viagra and generic alternatives) works by dilating blood vessels throughout the body, not just in the penis. This increased blood flow can cause mild to moderate headaches in some men, particularly during the first few uses as your body adjusts to the medication.
The NHS advises that most Viagra headaches are mild and temporary. Staying well-hydrated is crucial - drink plenty of water before taking your dose and throughout the day. Many men find headaches reduce significantly after the first few doses as their body adapts to the medication. If headaches persist, your prescriber may recommend starting with 25mg instead of the standard 50mg dose.
Paracetamol or ibuprofen can be safely taken alongside Viagra or sildenafil to manage headaches, but always check with your prescriber first. Avoid combining with alcohol, which can worsen headaches and reduce the medication's effectiveness. Never take any nitrate-based medications for headaches, as this creates a dangerous interaction with sildenafil.
Contact your prescriber if headaches are severe, persistent, or accompanied by vision changes, chest pain, or dizziness. These could indicate the dose needs adjusting or that an alternative ED treatment might be more suitable. EverydayMeds offers both Viagra and generic sildenafil options, allowing you to choose based on your preferences and budget whilst receiving the same active ingredient and clinical support.
Your EverydayMeds prescriber may recommend taking your dose with food to slow absorption and reduce side effects, though this may delay onset of action. Some men benefit from taking their dose earlier in the day when possible, as this allows any side effects to resolve before bedtime.
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