A Review of Viagra

Viagra is by far the most recognizable brand and for the drug sildenafil citrate. It is produced and marketed by pharmaceutical giant Pfizer, and is also sold under the name Ravatio and Caverta in certain locations around the world. Viagra is produced for one reason and one reason only, to treat erectile dysfunction, or as is known, ED. It takes the form of a blue pill in 25mg, 50mg and 100mg dose. Although available only by prescription from a doctor, you can Buy Viagra over the Internet, if desired.

The drug Viagra was not yet to address what is now famous for, in the beginning. It was designed in the 1990s in order to treat a form of heart disease known as angina. It did not work for the purpose it was intended, however, researchers of the drug noticed an interesting side effect of the drug to which they are tested. It consistently induced erections.

They had a goldmine on their hands and they knew it. Then it was patented in 1996 with the intention of development as a treatment for ED. By 1998 it had passed the tests required for FDA approval and was released to the public where he was received with open arms and open legs.

Erectile dysfunction is a common disorder in men, and is caused by a number of factors. Some of the most common causes behind ED are psychological in origin, and some are also on the basis of physical anomalies. The vast majority of men will find they will have some difficulties getting or maintaining an erection at one time or another, although they may be perfectly healthy.

These are the cases where Viagra has proven very effective. Some cases of erectile dysfunction can be caused by nerve damage, diabetes, or hypogonadism, and in these cases Online Viagra may not be effective. If a doctor more effectively screen new officers of questions to see if they can help pay

Viagra is classified as a PDE5 inhibitor. Pretty fancy name is not it? PDE5 causes a compound called cyclic GMP or cGMP to degrade. Since cGMP causes the arterial smooth muscles in the penis to relax, then allow the penis to become engorged in blood, which is how you create an erection. Suspend or limit the action of PDE5 will result in the erection of the penis, if the individual has a bill otherwise clean health. Some PDE5 inhibitors available today include Levitra and Cialis. You've probably heard them all, because they advertise very aggressively for this lucrative market.

Viagra is not without side effects and some of them include headaches, upset stomach, flushing and sweating. Viagra has been reported to also cause blurred vision in some cases and in rare cases have been reported cases of temporary blindness. Viagra should not be used in combination with drugs designed to treat angina pectoris, which can cause a severe drop in blood pressure that can be very dangerous. Although available on the Internet, it is always advisable to consult a qualified physician before taking any medication, including Viagra.