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When buying Viagra on the internet, make sure that you are asked to answer several questions in the form of a reliable health form and that your order is checked by a qualified doctor.

Viagra is the trade name for sildenafil citrate, its international nonproprietary name. Viagra is an oral treatment for erectile dysfunction or impotence in men. Impotence is defined as an inability to achieve or maintain an erection sufficient for sexual activity. Viagra helps restore poor erectile function by increasing blood flow to the penis. Sexual stimulation is necessary for the use and effectiveness of Viagra. Viagra is a treatment for men only.

Mechanism of action

During an erection during sexual stimulation, a substance called nitric oxide (NO) is released into the cavernous body of the penis. This release of nitric oxide will lead to an increase in a mediator allowing erection.

Viagra is an inhibitor of the type 5 phosphodiesterase enzyme. This type 5 phosphodiesterase enzyme is responsible for the degradation of the mediator that allows erection. The inhibition of type phosphodiesterases (PDE5) by sildenafil citrate, therefore, allows an increase in this mediator. This increase in the concentration of this mediator will then allow a relaxation of the blood vessels promoting an influx of blood into the cavernous body leading to an erection, during sexual arousal. Sexual stimulation is necessary for there to be a release of NO.

  • Absorption is rapid. The drug concentration is highest between 30 minutes and 2 hours after ingestion.
  • Sildenafil citrate is mainly eliminated by the liver.
  • The elimination half-life (the time taken for a substance to lose half of its pharmacological or physiological activity) is 4 hours.

Therapeutic objectives and indications

  • Obtain an erection sufficient to perform a sexual act.
  • This treatment is indicated for men over 18 with erectile dysfunction or impotence. It is not indicated for women. This treatment is prescribed after consulting a doctor.

Adverse effects

Sildenafil Citrate or Viagra is an oral treatment for erectile dysfunction or impotence in men. It helps restore impaired erectile function by increasing blood flow to the penis. It is prescribed after medical advice and may be contraindicated in some cases.

The most common side effect is a headache.

Other fairly common side effects can occur such as:

  • Redness in the face.
  • Digestive disorders.
  • Vision disorders such as sensitivity to light, color perception disorder, and reduced visual acuity.
  • Dizzying sensations.
  • Stuffy nose.

Viagra-like medicines can cause allergic reactions.

Viagra can cause prolonged and painful erections. In this case, the doctor must be consulted urgently.

Other serious but rare side effects have been reported:

  • Hypertension or hypotension with fainting.
  • A cerebral vascular accident.
  • Hearing loss.
  • Cardiac arrhythmias …

Precautions for use

Sildenafil Citrate or Viagra is an oral treatment for erectile dysfunction or impotence in men. It helps restore impaired erectile function by increasing blood flow to the penis. It is prescribed after medical advice and may be contraindicated in some cases.

Viagra is administered to men over 18 years of age in the absence of contraindications. It can be taken with or without food. Viagra works more slowly after a high-fat meal. It is taken an hour before sex. It is recommended not to exceed one intake per day. Viagra is prescribed after an examination of the cardiovascular function by the doctor. Any sexual activity carries a heart risk.

Precautions for the use of viagra should be taken in patients with certain diseases such as:

  • A deformity of the penis or Peyronie’s disease (sclerosis of the cavernous bodies).
  • Heart problems. It is necessary to assess whether the heart can tolerate the physical activity generated by sexual intercourse.
  • A bleeding disorder or ulcer.
  • A blood disorder that can cause a painful or persistent erection is called priapism.
  • A kidney or liver problem since the drug is eliminated by these 2 organs.

Drug interactions

Combining sildenafil with medicines called nitrates can cause severe hypotension. Medicines prescribed to relieve angina or angina contain nitrates. They should not be prescribed at the same time. The same is true for products containing nitrites such as poppers or other orgasm enhancer products sold in sex shops.

The effect of sildenafil may be increased if the patient is taking other protease inhibitors such as for the treatment of HIV. The dosage of Viagra will then be adjusted to a lower dose.

Patients treated with alpha-blockers for high blood pressure or enlarged prostate may experience dizziness on viagra secondarily to a rapid drop in blood pressure when changing from lying to standing.

Contraindications

The drug is contraindicated if:

  • There is an allergy to Sildenafil or to one of the components of Viagra.
  • There is severe heart disease.
  • There is severe liver failure.
  • If there has recently been a myocardial infarction or heart attack, a stroke.
  • There is low blood pressure.
  • You are taking medicines called nitrates that can cause a potentially dangerous drop in blood pressure.
  • There is a rare inherited eye disease (retinitis pigmentosa).
  • There is loss of sight secondary to an anterior non-arteritic ischemic optic neuropathy which is an eye injury characterized by necrosis of the optic nerve.

Viagra can cause blurred vision and dizziness. The patient should already know his reaction to the drug before driving.

This medicine is not intended for women.

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