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Viagra side effects are usually mild to moderate and last a short time but it is important to take the recommended dose. The most common side effects are a headache and facial flushing. Less common effects include indigestion, dizziness, stuffy nose and visual effects (a blue coloured tinge to vision and increased brightness of light or blurring).
Viagra (Sildenafil) should only be taken if prescribed by a registered doctor. This is because Viagra can be dangerous if you take it at the same time as certain other medicines including some that are used to treat chest pain (angina). In addition, men with severe heart or liver problems or have had a recent stroke, heart attack, or who have low blood pressure should not take it.
You should consult the full list of side effects for Viagra on the patient information leaflet provided with your treatment. Details of this can also be found here.