Viagra (Sildenafil Citrate)

What Makes Viagra Work?

Viagra is a prescription medication approved to treat erectile dysfunction in men over 18 years of age. Viagra's active ingredient - Sildenafil citrate belongs to a group of medicines called PDE5 inhibitors. Viagra helps to achieve erection in men suffering from erectile dysfunction.

Function

Viagra works by inhibiting the activity of an enzyme phosphodiesterase type 5. PDE5 breaks down cyclic GMP and thus prevents the relaxation of smooth muscles in the cavernous body. By inhibiting this enzyme Viagra increases blood flow to the penis causing strong and potent erection. The medication does not work without sexual stimulation.

Time frame

According to the results of clinical investigation, Viagra typically begins working in 30-60 minutes after oral administration. Viagra exerts its therapeutic effect for 4 hours.

Considerations

Men over 65 years of age and men with liver and mild renal diseases are prescribed 25mg, men under 65 years usually take Viagra 50mg. In severe cases of ED, Viagra 100mg can be prescribed.

Side effects

The most common Viagra side effects include: diarrhea, dyspepsia, headache, hot flashes, nasal congestion, insomnia. Viagra side effects are frequently observed in men with hypersensitivity to Sildenafil citrate and other components of the medication.

Warnings

Viagra should be used exactly as prescribed. Do not take Viagra more than once daily. If the erection persists for more than 4 hours, make sure to consult your health care provider. Viagra is contraindicated for patients who take nitrates, have severe cardiovascular diseases.