What are the side effects of Viagra?

With prolonged use, Viagra causes side effects that can be dangerous for men's health. The active substance of the drug - sildenafil - stimulates blood flow to the penis and provides a long-lasting erection. Such an unusual effect made it popular among men of all age categories.

Many people use Viagra to restore male strength, but not everyone knows that pills have strict contraindications and unpleasant side effects.

Contraindications

Initially, sildenafil was clinically tested as a drug for the treatment of cardiovascular diseases, but after a positive effect on male potency was discovered, its purpose changed. The main effect of Viagra is associated with a vasodilating effect on the entire body, which entails a decrease in blood pressure. Therefore, it is not recommended for cardiovascular diseases and during antihypertensive therapy.

All contraindications can be conditionally divided into 2 groups: diseases and combination with other drugs.

Diseases

There are a number of conditions in which the use of the drug is prohibited:

• Hypersensitivity to the components of the drug;
• Anatomical deformity of the penis;
• Blood diseases;
• Peptic ulcer of the stomach or duodenum during an exacerbation;
• Bleeding;
• Unstable hemodynamics in angina pectoris and heart failure;
• Arterial hypertension (BP above 170/100mmHg);
< li>Hypotension (BP below 90/50mmHg);
• Heart attack or stroke less than 6 months old.

The elderly who have contraindications with cardiovascular diseases should be especially careful. Their metabolism is slower than in healthy adults, so the drug stays in the blood longer.

The long-term effect of sildenafil along with sexual activity and concomitant disease can be fatal.

Drug Compatibility

Many drugs stimulate the action of sildenafil. They block the metabolism of a substance in the liver, thereby increasing its content in the blood. The use of Viagra with nitrates (nitroglycerin) and alpha-blockers (doxazosin, nicergoline) can provoke severe hypotension, and simultaneous use with erythromycin, cimetidine, ketoconazole, itraconazole and ritonavir enhances the therapeutic effect of the drug.

Side effects

The main therapeutic effect of Viagra is impossible without side effects. Most of them are quite typical and appear during clinical trials, and some are registered only after the drug goes on sale. They are usually temporary and not dangerous to health. The most common side effects after taking Viagra are:

• Headache, dizziness;
• Clearness of vision;
• Change in light perception;
• Rhinitis;
• Ringing in tinnitus, deafness;
• Hot flushes;
• Skin allergic reactions;
• Diarrhea, vomiting;
• Heart palpitations, fainting;
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• Tachycardia;
• Decrease in blood pressure;
• Prolonged erection (more than 4 hours).

Fatal infarction and stroke are very rare. Therefore, patients with a predisposition to thrombosis should better refrain from taking Viagra. The frequency and severity of side effects depends on many factors:

• Age and health of the person;
• Dosage;
• Presence of contraindications or concomitant diseases;
• Manufacturer.

Viagra is contraindicated in men under 18 years of age or before the state of puberty, as it can cause hormonal imbalances. The presence in the patient of individual hypersensitivity to the components of the drug entails the appearance of allergic reactions.

The tablets are available in three dosages: 25 mg, 50 mg and 100 mg. The recommended daily dose is 50 mg, the maximum allowable dose is 100 mg.

With an increase in the dosage of the drug, the risk of adverse effects increases. In order to avoid undesirable consequences, the doctor should prescribe the dosage based on the individual health status of the man.

The presence of contraindications affects which side effects. So, for example, in patients with anatomical deviations of the penis, a prolonged painful erection can be observed, and in patients with heart disease, palpitations and fainting.

All Viagra analogues have the same main action. However, the production technology and the quality of the feedstock have a significant impact on the degree of manifestation of side effects.

Viagra is an indispensable assistant in the fight against impotence for many men, but, like all drugs, it must be used with caution. It is necessary to adhere to all the rules of use and observe the dosage, this will help not only achieve the desired result, but also maintain health.