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Priapism is a persistent erection of the penis, that lasts longer than four hours. It is not caused by sexual stimulation and can be painful. Priapism is dangerous and can cause long-lasting damage. To avoid priapism, only ever take Viagra that has been prescribed to you and ensure your Viagra is from a registered pharmacy. You can identify if your Viagra is genuine by its blue colour, rounded diamond shape and the lettering on the pill: “Pfizer” on one side and “VGR” on the other, followed by the dosage.

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