Viagra is used for various disorders in sexual desire in men. It contributes to achieving an erection, but at the same time, it does not have a therapeutic effect on dysfunction, since it acts symptomatically. The action of the drug is determined by the ability of the active ingredient, sildenafil, to inhibit phosphodiesterase 5, which is involved in the breakdown of cyclic guanosine monophosphate, necessary for relaxing the muscles of the cavernous body. When the muscles of the cavernous body relax, blood flow in the male genital organ improves, its size increases, and erectile function is normalized, provided sexual stimulation occurs. An important component for the onset of an erection is nitric oxide, the relaxing effect of which enhances sildenafil. Drug absorption is 40%. Metabolism occurs in the liver. Excretion occurs mainly in the feces.

Release form, composition

The drug is produced in tablets in the shell for oral administration. 1 tablet contains: Sildenafil citrate, calcium hydrogen phosphate, magnesium stearate, croscarmellose sodium, titanium oxide, tracetin, etc., including lactose.

Indications for use

The drug is indicated for use in the presence of erectile dysfunction of various etiologies.

Contraindications

The use of the drug is contraindicated in the presence of increased sensitivity and intolerance to the components of the drug, as well as in the presence of such factors as:

  • predisposition to bleeding;
  • injury, deformation of the penis;
  • ulcers in the gastrointestinal tract;
  • disruption of the liver;
  • severe liver failure;
  • cirrhosis of the liver;
  • prolonged painful erection;
  • persistent high blood pressure;
  • persistent low blood pressure;
  • arrhythmia;
  • angina pectoris;
  • heart failure;
  • age up to 18 years.

If a history of myocardial infarction and stroke is present, you should refrain from taking the drug for 6 months after the disease. In no case Viagra can not be combined with other drugs that affect nitric oxide. Also, you should exclude the reception of funds to persons who are contraindicated sexual activity.