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Sildenafil

Sildenafil, commonly referred to by its trade name Viagra, is a member of the phosphodiesterase type 5 (PDE5) inhibitor class of medications. Here are the notable features of sildenafil:

Mechanism of Action

• Sildenafil inhibits phosphodiesterase type 5 (PDE5), which normally degrades cyclic guanosine monophosphate (cGMP). During sexual arousal, increased nitric oxide (NO) levels elevate cGMP, facilitating the relaxation of smooth muscle and enhancing blood flow to the penis.
• This process helps achieve and sustain an erection.

Indications

• This medication is primarily indicated for treating erectile dysfunction in men.
• It may also be prescribed under the name Revatio for treating pulmonary arterial hypertension.

Onset of Action

• Sildenafil typically starts to take effect within 30 minutes, although it can take up to an hour for some individuals.

Duration of Action

• The effects of sildenafil generally last between 4 to 5 hours, enabling the achievement and maintenance of an erection during this time.

Dosage

• The typical initial dose of sildenafil is 50 mg, adjustable based on individual effectiveness and tolerability.
• It’s recommended to take the dose approximately 30 minutes to 1 hour prior to engaging in sexual activity.

Side Effects

• Common side effects may include headache, facial redness, digestive discomfort (nausea, diarrhea), vision alterations (blurred and color vision changes), elevated blood pressure, and, on rare occasions, hearing loss or changes.

Contraindications

• Sildenafil must not be used with nitrates (such as nitroglycerin) due to the risk of dangerously low blood pressure. It is also contraindicated for patients with serious heart conditions or those who have recently suffered a heart attack or stroke.