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Sign In or Register. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Retrieved 5 April Drugs for erectile dysfunction G04BE and premature ejaculation.

Generic Viagra - When will it be available? Sildenafil was reclassified in New Zealand in so it could be bought over the counter from a pharmacist.

This smooth muscle relaxation leads to vasodilation and increased inflow of blood into the spongy tissue of the penis, causing an erection.

Subscribe to free Drugs. Atevirdine Azaperone Delavirdine Mirtazapine Pyridinylpiperazine. Division of Pfizer, Inc. The patent was published in and expired in Sildenafil should not be used if sexual activity is inadvisable due to underlying cardiovascular risk factors [19].

Sildenafil is broken down in the liver by hepatic metabolism using cytochrome p enzymes, mainly CYP 3A4 major route , but also by CYP2C9 minor route hepatic isoenzymes.

However, at least one court case has resulted in a product being taken off the market.