Viagra is the most effective stimulant of potency which is used to restore erection in men with psychogenic or organic erectile dysfunction.

Viagra contains the active ingredient Sildenafil. This is the first peroral medicine for the treatment of the erectile dysfunction which was approved by FDA in 1998. Before, the ingredients with the analogical mechanism of action were used in the medical therapy (injections). It was painful and not effective as the use of Viagra pills.

Pfizer company owns an exclusive patent rights for the brand name Viagra and has synthesized Sildenfil citrate and announced about a new revolutionary method of the erectile dysfunction treatment. A chemical formula of Sildenafil is available already and used by many pharmaceutical companies in the production of Generics Viagra.

Therapeutic effect of Viagra is built on the pharmacological properties of Sildenafil. This active ingredient increases natural mechanisms of the erection appearance and gives an opportunity to return to complete sexual life.

Mechanism of action of Viagra (Sildenafil)

Viagra is the most studied medicine for the treatment of the erectile dysfunction. The mechanism of action is well known on all stages of the erection development, and therefore sildenafil is considered one of the safest products for the stimulation of potency.

The action of Viagra is started from the moment of the sexual stimulation. This medicine does not cause uncontrollable erection. If the man took a pill, he will not feel the action of sildenafil before the sexual arousal.

At the moment of the sexual arousal, Sildenafil blocks phosphodiesterase 5 enzyme, so that the concentration of the important ingredient cyclic guanosine monophosphate is increased in the cavernous body. As a result of these biochemical processes, a relaxing effect of the nitric oxide is increased to the smooth muscles of the cavernous bodies, and the blood flow is increased in the penis.

Even if the man has some vascular diseases, pancreatic diabetes, atherosclerosis or other vascular diseases, it will not bother Sildenafil to increase the blood circulation in the tissues of the penis. As you know, the increased blood flow to the cavernous bodies causes erection.

Viagra does not influence on the sexual arousal, and therefore the medicine is useless for these purposes. If a man has problems with sexual arousal, it is necessary to increase libido but by means of other way.

How long does Viagra (sildenafil) work?

Viagra has a reversible action, and therefore it does not have a healing effect. This medicine is required for the prevention of impotence I order to restore the blood circulation in the penis during any dysfunctions in the body.

The action of Viagra is restricted. On the average, the length of the action of single dose of Viagra is 4-5 hours. The man can have several sexual intercourses within this period. The action of the medicine will not be stopped after the first ejaculation.

Sildenafil has a unique ability to quickly restore erectile function between sexual intercourses. The man can use time within the period of the action of one Viagra pill, and enjoy the intimacy with his partner.

The concentration of Sildenafil is dropped in the blood in 4-5 hours (the period of action may vary depending on the body weight and sensitivity to Sildenafil), and Viagra loses its function. If the man takes pills to maintain erection, he should to end a sexual intercourse earlier than Viagra action will.

Recommendations for the safe use of Viagra

Despite 4-5-hour-action of Viagra, this medicine should not be taken 2-3 or more times per day. Sildenafil is completely excreted from the body within 24 hours, and if you want to avoid side effects, Viagra must be taken once per day.

In order to achieve the maximal result, take Viagra 30-40 minutes before the sexual intercourse, on an empty stomach. The pills will be dissolved in the intestinal tract in 40 minutes, and you will be ready for the sexual activity.

The use of Viagra after meals will slow down the onset of the effect, and you will not predict the beginning of the action – in 60 minutes or in 90 minutes.

A single dose of Viagra is 50 mg. This is an optimal option for most men. The dose can be adjusted depending on the therapeutic effect. The maximal dose of Viagra is 100 mg per day.

The minimal dose of Viagra is 25 mg per day

The dose adjustment will help to find an effective dosage regimen of the treatment of the erectile dysfunction and avoid the side effects.

If you want to avoid severe headache, allergic reaction, dizziness, or vomiting during the sexual intercourse, do not take Viagra before or after alcohol consumption. Sildenafil interacts with ethanol and it will lead to the negative reactions of the body.

If you follow all rules for the use of Viagra, but you still fell side effects, it is necessary to lower the daily dose up to 25 mg. This way, the side effects will be hardly probable.

Due to the positive stimulating characteristics of Viagra, this medicine can be used for a long time. But Sildenafil is not a panacea for impotence, and even if the medicine is used within 1-2 years, it will not help to cure of the erectile dysfunction. If the man has problems with potency, the body has a disorder. If this disorder is removed, the erection will work well even at old age.