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Viagra or sildenafil is a prescription medication used for erectile dysfunction. It is prescribed by physicians as a 'PRN' prescription. 'PRN,' (Pro re nata) is a Latin phrase meaning "as the circumstance arises." It is not taken as a prescribed course.

Under No circumstance should Viagra be taken without a direct prescription from a qualified physician. Viagra can be lethal in certain circumstances. If you are taking any medications for high blood pressure, under no circumstance should you even consider Viagra as it can induce a life-threatening stroke.

Consult with your GP for both your prescription and advice as to how many times you may take Viagra within the period of a week.

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12y ago

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