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Sildenafil

Erectile Dysfunction treatment has evolved with Sildenafil, a highly effective medication classified as a phosphodiesterase type 5 (PDE5) inhibitor, more commonly recognized by its brand name, Viagra.

Key Characteristics of Sildenafil

Mechanism of Action

• This medication functions by inhibiting the enzyme phosphodiesterase type 5 (PDE5), responsible for breaking down cyclic guanosine monophosphate (cGMP).
  Upon sexual stimulation, nitric oxide (NO) release in penile tissues elevates cGMP levels, promoting smooth muscle relaxation, thus enhancing blood flow to the penis.
• This mechanism facilitates the achievement and maintenance of an erection.

Indications

• Erectile Dysfunction in men is the primary use of sildenafil.
• Additionally, it is prescribed for treating arterial hypertension under the brand name Revatio.

Onset of Action

• The onset of sildenafil is generally rapid, typically commencing around 30 minutes post-ingestion, though some patients may require up to 1 hour.

Duration of Action

• Effects typically persist for 4 to 5 hours, allowing adequate time for both the achievement and maintenance of an erection.

Dosage

• The initial recommended dose is 50 mg, adjustable based on individual tolerance and efficacy.
• Administer the dose approximately 30 minutes to 1 hour before engaging in sexual activity.

Side Effects

• Common side effects may include headache, facial flushing, indigestion (such as nausea and diarrhea), vision disturbances (including blurred vision and color changes), elevated blood pressure, and in rare cases, alterations in hearing.

Contraindications

• Co-administration with nitrates (e.g., nitroglycerin) is strictly prohibited due to the risk of a serious drop in blood pressure.
  Moreover, it is contraindicated for patients with significant cardiac issues or those who have recently suffered a myocardial infarction or stroke.