Viagra
Viagra is the most popular brand name for the drug sildenafil citrate. It is marketed today by the pharmaceutical company Pfizer, and is also sold under the name Ravatio and Caverta in certain parts of the world. Viagra is designed to treat erectile dysfunction, or ED. It comes in the form of a blue pill in 25mg, 50mg, and 100mg dosages. Although it is available only by way of a doctor’s prescription, there are numerous websites on the internet that sell Viagra after filling out a short questionnaire.
The drug Viagra was designed in the 1990s with the intention of treating a form of cardiovascular disease known as angina pectoris. Though it was not found effective for its original intention, researches of the drug remarked on its ability to induce erections in male study participants. It was then patented in 1996 with the intention of development as a treatment for ED. By 1998 it had passed the necessary tests for FDA approval, and hit the market with immediate and large-scale success.
Erectile dysfunction is a very common disorder in men, and can develop for a number of reasons. Some of the most common causes behind ED are psychological in origin, and are not based on any physical irregularities. Most men experience some difficulty getting or maintaining an erection at some point in their lives, even though they are otherwise healthy. For these cases, drugs like Viagra are extremely effective. Some cases of ED can be caused by damage to the nervous system, diabetes, or hypogonadism, and in these cases Viagra may not be effective.
Viagra is classified as a PDE5 inhibitor. PDE5 causes a compound called cyclic GMP or cGMP to degrade. Since cGMP causes the arterial smooth muscles in the penis to relax, allowing the penis to fill with blood and become erect, inhibiting the action of PDE5 will lead to penile erections so long as the individual is otherwise healthy. Some other PDE5 inhibitors available today include Levitra, and Cialis.
The most common side effects of Viagra include headache, stomach upset, flushing, and sweating. Occasionally, users of Viagra experience blurred vision, and in some rare cases have reported temporary lose of sight in one or both eyes. Viagra should not be taken in conjunction with drugs designed for angina pectoris, as together they can induce a dangerous drop in blood pressure. Even though it is available on the internet, it is not recommended you take Viagra without prior consultation with a physician.
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