What is Sildenafil – Viagra?

Sildenafil – Viagra is one of the best known and most widely used drugs for treating male erectile dysfunction. Sildenafil citrate is the active ingredient responsible for the drug's effectiveness and is clinically approved to improve the ability to achieve and maintain an erection in the presence of sexual stimulation.

Sildenafil was originally developed to treat angina pectoris, a cardiovascular condition linked to reduced blood flow to the heart. However, during clinical trials, a significant effect on erectile function was observed, leading to the drug's approval as a specific treatment for erectile dysfunction.

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How Sildenafil – Viagra works

The mechanism of action of Sildenafil – Viagra is based on increasing blood flow to the penis during sexual arousal. The drug acts selectively on the phosphodiesterase type 5 (PDE5) enzyme, promoting smooth muscle relaxation and blood vessel dilation. This process allows for greater blood flow to the corpora cavernosa and enables a firmer and longer-lasting erection.

It is important to note that Sildenafil does not cause an erection in the absence of sexual stimulation, but enhances the natural physiological response.

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Main benefits of Sildenafil – Viagra

Treatment of erectile dysfunction

Sildenafil – Viagra is widely recognized as an effective aid to male sexual health. It improves the quality of erections, increases personal confidence, and contributes to a more satisfying sex life.

Pulmonary arterial hypertension

In addition to its use in erectile dysfunction, Sildenafil is also approved for the treatment of pulmonary arterial hypertension (PAH). In this context, the drug helps reduce pressure in the pulmonary vessels, improving exercise capacity and slowing the progression of the disease.

Cardiovascular benefits

Clinical studies indicate that sildenafil may have positive effects on the cardiovascular system, improving endothelial function and blood flow regulation. Its vasodilatory action contributes to better oxygen distribution in the tissues.

Improvement of operating capacity

Thanks to improved circulation and muscle oxygenation, Sildenafil – Viagra can increase physical endurance and reduce fatigue, making it useful for physically active individuals.

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Mechanism of action: role of PDE5

During sexual arousal, the body releases nitric oxide (NO), which stimulates the production of cGMP, a molecule essential for the relaxation of the smooth muscles in the penis. The enzyme PDE5 breaks down cGMP, interrupting the erectile signal.

Sildenafil – Viagra selectively inhibits PDE5, allowing cGMP to act for longer. This leads to:

• greater vasodilation,

• increased blood flow,

• more stable and prolonged erection.

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Pharmacokinetics

• Absorption: rapid, with effects that may begin within 30–60 minutes

• Metabolism: hepatic, via CYP3A4 and CYP2C9 enzymes

• Half-life: approximately 4 hours

• Elimination: mainly in feces and partly in urine

Taking it with high-fat meals may slow absorption and reduce initial effectiveness.

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Directions for use and dosage

• Recommended starting dose: 50 mg

• Intake: approximately 1 hour before sexual activity

• Dosage adjustment: possible reduction to 25 mg or increase to 100 mg based on individual response

• Frequency: once a day

For the treatment of pulmonary hypertension, the dosage follows specific protocols established by the physician.

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Precautions and contraindications

Sildenafil – Viagra should be used with caution in the presence of:

• cardiovascular diseases,

• liver or kidney failure,

• intake of nitrates or nitric oxide donors,

• concomitant use of alpha-blockers.

Alcohol consumption may reduce the effectiveness of the medication and increase the risk of side effects.

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Possible side effects

The most common side effects include:

• headache,

• facial flushing,

• digestive disorders,

• nasal congestion,

• minor visual disturbances.

Rare but serious events, such as priapism or cardiovascular problems, require immediate medical attention.

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Storage

Store Sildenafil – Viagra at room temperature, away from heat, moisture, and direct light. Keep out of reach of children and pets, and do not use after the expiration date.

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