What is Sildenafil – Viagra?

Sildenafil – Viagra is one of the most well-known and widely used drugs for the treatment of 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 during sexual stimulation.

Sildenafil was originally developed for the treatment of angina, a cardiovascular condition associated with reduced blood flow to the heart. During clinical trials, however, a significant effect on erectile function was discovered, 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 increased blood flow to the penis during sexual arousal. The drug selectively acts on the enzyme phosphodiesterase type 5 (PDE5), promoting smooth muscle relaxation and blood vessel dilation. This process allows for greater blood flow to the corpora cavernosa and results in a firmer and longer-lasting erection.

It is important to underline that Sildenafil does not cause 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 support for male sexual health. It improves the quality of erections, increases self-confidence, and contributes to a more satisfying sex life.

Pulmonary arterial hypertension

In addition to its use for erectile dysfunction, sildenafil is also approved for the treatment of pulmonary arterial hypertension (PAH). In this setting, 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 effect contributes to improved oxygen distribution in tissues.

Improved exercise capacity

By improving circulation and muscle oxygenation, Sildenafil – Viagra can increase physical endurance and reduce fatigue, making it useful even 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 of the penis. The PDE5 enzyme degrades cGMP, interrupting the erectile signal.

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

• increased vasodilation,

• increased blood flow,

• more stable and prolonged erection.

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Pharmacokinetics

• Absorption: Rapid, with effect beginning within 30–60 minutes

• Metabolism: hepatic, via CYP3A4 and CYP2C9 enzymes

• Half-life: approximately 4 hours

• Elimination: mainly through feces and partly through urine

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

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How to use and dosage

• Recommended starting dose: 50 mg

• Dosage: 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 doctor.

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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 drug and increase the risk of side effects.

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Possible side effects

The most common side effects include:

• heachache,

• facial redness,

• digestive disorders,

• nasal congestion,

• mild visual changes.

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

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Conservation

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

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