Viagra 50 mg improves blood flow to the penis by inhibiting PDE5, thus facilitating an erection in response to sexual stimulation. It is taken 30 to 60 minutes before sexual intercourse and is effective for 4 to 6 hours. Although generally well tolerated, it can cause mild side effects such as headaches or hot flashes. A medical consultation is recommended.

Everything you need to know about Viagra 50mg?

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Medically reviewed by Notre équipe éditoriale

Written by Anne-Sophie Laignel

Last updated 1/22/2025 - 5 min read

The mechanism of action of Viagra 50 mg

Viagra 50 mg works by inhibiting the PDE5 enzyme, which is responsible for breaking down cyclic guanosine monophosphate (cGMP) in the penis. cGMP is essential for the erection process. When a man is sexually stimulated, the body releases nitric oxide, a compound that stimulates the production of cGMP. This leads to the relaxation of smooth muscles in the arteries of the penis, allowing blood to flow freely and fill the penile corpora cavernosa, resulting in an erection.

PDE5, naturally present in the body, is responsible for the degradation of cGMP, which reduces the ability to maintain an erection. Viagra 50 mg blocks this enzyme, allowing cGMP levels to increase and remain high, thus facilitating a sustained erection when a man is sexually aroused.

It is crucial to note that Viagra does not cause an erection spontaneously. Sexual stimulation is always necessary to trigger a response from the medication. This means that Viagra 50 mg enhances the body's reaction to sexual stimulation, but does not create an erection without arousal.

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The dosage and frequency of administration of Viagra 50 mg

Viagra 50 mg is often prescribed as the initial dose for men who have never taken this medication before or who have a history of poor response to treatment with lower doses. Depending on the response to the medication, the dose may be adjusted.

Viagra 50 mg should be taken about 30 to 60 minutes before sexual intercourse. The medication starts to work relatively quickly, and its maximum effectiveness is usually reached after 1 to 2 hours. The dose can be adjusted based on the patient's needs and response to treatment, reducing to 25 mg for side effects or increasing to 100 mg for men requiring a stronger dose.

It is important to adhere to the dosage prescribed by a doctor. Taking more than 50 mg at one time does not enhance the drug's effects and may increase the risk of side effects. Furthermore, Viagra 50 mg should not be taken more than once a day.

The medication can be taken with or without food, but it is important to note that the absorption of Viagra can be delayed if it is taken after a meal high in fat.

The duration of effect of 50 mg Viagra

Viagra 50 mg remains effective for about 4 to 6 hours after ingestion. During this period, a man can achieve and maintain an erection in response to sexual stimulation. However, the erection will not be continuous, but can occur several times during this 4 to 6-hour window, depending on sexual arousal.

It is essential to understand that Viagra does not cause an automatic erection. The effect of the drug is related to sexual stimulation, and the erection disappears as soon as the excitement ceases. Once the medication is absorbed, its effect begins to wane after 4 hours, but it can last longer in some people, depending on individual factors such as age, health status, and the use of other medications.

In case of an erection that persists for more than 4 hours (priapism), it is important to seek immediate medical attention to avoid serious complications.

Possible side effects of Viagra 50 mg

Viagra 50 mg is generally well tolerated, but it can cause some side effects. The most common side effects are mild and temporary. Among them are:

  • Headaches: This is one of the most common side effects with Viagra.
  • Hot flashes: A feeling of warmth or redness in the face or neck.
  • Digestive troubles: Such as stomach aches, heartburn, or bloating.
  • Nasal congestion: Some people experience a stuffy nose or difficulty breathing through the nose.
  • Visual changes: Mild visual impairment, including increased sensitivity to light or altered color perception (notably a bluish tinge).

Although rare, more serious side effects can occur, such as:

  • Priapism: A prolonged and painful erection lasting more than 4 hours that requires immediate medical attention.
  • Heart issues: Viagra can lead to serious adverse effects for individuals with a history of heart diseases.
  • Severe vision problems: Sudden loss of vision in one or both eyes is a rare but serious side effect.

Serious side effects are rare, but it is essential to consult a doctor if one occurs. If in doubt or if you experience persistent adverse effects, it is important to get in touch with a healthcare professional.

The contraindications and precautions to take

Viagra 50 mg should not be taken by certain individuals, especially those who:

  • Take medications containing nitrates, used to treat angina pectoris, as this combination can cause a dangerous drop in blood pressure.
  • Have a history of serious heart problems, uncontrolled high blood pressure, or liver or kidney diseases.
  • Are allergic to any of the components of Viagra.
  • Have serious eye disorders, such as retinitis pigmentosa, a hereditary eye disease.

It is always recommended to consult a doctor before starting treatment to discuss your medical history and any other medications you are taking to avoid any interactions.

Viagra 50 mg is an effective option for treating erectile dysfunction, offering quick action and a duration of effect from 4 to 6 hours. It works by inhibiting the PDE5 enzyme, thus facilitating blood flow in the penis and allowing an erection in response to sexual stimulation. Like any medication, Viagra should be taken under a doctor's supervision to minimize the risk of side effects and ensure its effectiveness. If serious side effects occur, immediate medical attention is necessary.

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