Viagra General Information
Viagra (Sildenafil) is one of the most potent PDE5 inhibitors, and it is used extensively to treat sexual dysfunction in men. This is a prescription drug, and it should be administered under the direction of your healthcare provider. Sildenafil is one of the most popular ED medicines in the world.
Viagra is available in tablets composed of white crystalline Sildenafil citrate powder. Tablets are round and diamond-shaped, featuring a blue filming. Each tablet may contain 25mg, 50mg or 100mg of sildenafil, as well as a number of other ingredients. Before taking the drug, it is highly recommended to thoroughly study its chemical composition, since some people can be allergic to its ingredients.
Viagra is not intended for pregnant women or children. However, some women have successfully used the medicine as a libido enhancer. In any event, no such action should be performed without a doctor's advice. Viagra is a prescription drug and it may cause unpleasant side effects and has contraindications.
Sildenafil is intended both for regular and occasional administration. It should be noted that it should not be taken more than once per day. The medicine starts working about half an hour after it is taken, and its action continues for 4 hours. Therefore, it can be administered any time within this framework before sexual activity.
One of the must-know things about Viagra is that it does not actually cure, but treats impotence. The drug limits the amount of PDE5 (phosphodiestrase type 5) - a natural enzyme that keeps the smooth muscle of the penis strained. This, in turn, stimulates the production of cyclic guanosine monophosphate (cGMP), which contributes to the loosening of the smooth muscle and therefore ensures the filling of the penile chambers with blood. cGMP is only synthesized during sexual stimulation, so the drug only works during sexual arousal.
Sildenafil is notorious for its hypertensive action, especially if used together with some other medicines. This is one reason why it should not be used concomitantly with nitrates that are used to treat chest pain and heart problems. The most common drugs referred to as 'nitrates' include nitroglycerine, isosorbide mononitrate and isosorbide dinitrate. Co-administration of Viagra with these drugs may cause your blood pressure to fall drastically, which is fraught with dizziness, faintness, and even a stroke. The drug should not be used together with many other medicines either, such as alpha-blockers (used for treatment of prostate dysfunction) or other ED drugs. If you have or have had serious health problems but feel like there is no way out for you but to use Viagra, consult your doctor before taking the drug!