Viagra (Sildenafil Citrate) 

While Cialis is known for its long duration, Viagra is prized for its potency and rapid onset. It is designed for specific windows of activity rather than daily maintenance.

Quick Facts

Mechanism of Action

Viagra works by enhancing the effects of nitric oxide, a natural chemical the body produces to relax muscles in the penis.

• PDE5 Inhibition: Sildenafil specifically targets the phosphodiesterase type 5 (PDE5) enzyme. By inhibiting this enzyme, it prevents the breakdown of cGMP.
• Increased Blood Flow: Higher levels of cGMP lead to smooth muscle relaxation and increased blood flow into the corpus cavernosum.
• Note: Viagra does not cause an automatic erection; sexual stimulation is still required to trigger the initial release of nitric oxide.

Usage & Administration

• Timing: For maximum efficacy, take the tablet roughly 60 minutes before sexual activity.
• Dietary Impact: High-fat meals can significantly slow down the absorption rate. For the fastest results, it is best taken on an empty stomach or after a light meal.
• Dosage: Most men start with 50 mg. Depending on efficacy and tolerability, the dose may be adjusted down to 25 mg or up to a maximum of 100 mg per 24-hour period.

Side Effects

Because Viagra affects blood vessel dilation throughout the body, users may experience:

• Visual Changes: A temporary bluish tinge to vision or increased sensitivity to light (unique to Sildenafil).
• Flushing: Redness or warmth in the face and neck.
• Headaches: The most common side effect due to cranial vasodilation.
• Nasal Congestion: Feeling "stuffed up."

 Strict Nitrate Warning

Like all PDE5 inhibitors, Viagra is strictly contraindicated with any form of organic nitrates (e.g., Nitroglycerin, Isosorbide) or "poppers" (Amyl Nitrate). This combination can lead to a fatal drop in blood pressure.

• Cardiovascular Health: Those with a recent history of heart attack, stroke, or severe arrhythmia should consult a cardiologist before use.
• Priapism: If an erection lasts longer than 4 hours, seek emergency medical help to avoid permanent tissue damage.
• Alcohol: Excessive alcohol consumption can decrease the effectiveness of the medication and increase the risk of side effects like dizziness.