Sildenafil (Viagra) has been available since the late 1990s for the treatment of erectile dysfunction and currently about 7 million prescriptions for Viagra are written every year, representing a billion dollars a year in sales. Like a lot of drugs, this one's journey to the pharmacist's shelf began in a quest to treat a different condition, in this case angina (heart disease). During trial studies researchers noticed that it had a positive effect on erection, which turned out to be stimulating news for Pfizer. The drug was patented in 1996, approved by the FDA on March 27, 1998 and become the first pill

Having low levels of testosterone can lead to serious illnesses such as osteoporosis. Testosterone therapy can help to bring the levels up and give you a better feeling about yourself.  Testosterone levels start to decline in your early 30's and they keep on declining throughout the rest of your life. You may have noticed that you are more anxious and are prone to being irritable very easily and can even change moods quickly. Concentration can also be affected, and you may have no interest in sex. All of these are potential symptoms of a lowered level of testosterone and should be told to your doctor so

After men have surgery to remove a cancerous prostate gland, up to 80% of them will lose the ability to have an erection because of damage to a critical nerve that runs along the prostate.

New research from Northwestern University Feinberg School of Medicine shows the damaged nerve can be regenerated more quickly with a protein called sonic hedgehog delivered via a nanofiber gel. The study, done with rats, showed the protein regenerated the damaged nerve twice as fast as it would have regenerated on its own. Speeding up the nerve healing is essential in order to prevent cell death in the penis an