Viagra Properties
Viagra (Sildenafil) is a drug intended for improvement of erectile function in men. It is a prescription drug that is available in tablets, which may contain 25mg, 50mg or 100mg of sildenafil citrate. Dosage should be defined with the help of a qualified physician.
Sildenafil has a clearly defined stimulating effect, but it is only observable when a man is in a state of sexual excitement. The drug possesses a unique 'selective' property, as it bears a direct influence on male sex organs. Along with Cialis and Levitra, Viagra belongs to the group of so called PDE5 inhibitors.
Sildenafil blocks the PDE5 enzyme that keeps the muscle in corpus cavernosum strained and boosts the release of cGMP enzyme that contributes to the relaxation of the muscle. The drug has a much greater influence on PDE5 than on any other enzyme. This is actually what its selective action lies in.
Viagra starts working about 30 minutes after administration and its effect lasts about 4 hours. Sexuality is usually at its best at 2 hours into the time span. At 3 hours, the effect is still observable, but is already on the decline. Normally, Sildenafil is administered 30 to 60 minutes before sexual intercourse. According to research, the effect's strength depends on the drug's dose and, consequently, plasma levels.
This medicine is not intended for women or children. Using it involves a number of risks, and hence it requires a serious and responsible attitude. Sildenafil may affect blood pressure and therefore cause adverse side effects. If co-administered with other drugs (nitrates, alpha-blockers, other stimulants, etc.), it may trigger a sudden and dramatic blood pressure drop. For this reason, Viagra is not intended for people suffering and undergoing treatment procedures for cardiac insufficiency, strokes, hypotension, aortic stenosis, or other cardiovascular diseases.
Viagra is only effective for several hours, and it does not fully eliminate the problem. When we use the drug, we treat just the symptom, not the problem itself. Therefore, this is not actually a cure against impotence. Erectile dysfunction often occurs as a sign of other serious disorders or as a reaction to stressful situations. In cases whereby psychological factors are behind impotence, Sildenafil will not work. The drug cannot and should not be viewed as a means of contraception, and it will not protect your body against sexually transmitted infections.