Viamed 20 product packaging
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VIAMED 20 (Sildenafil Citrate)

• CAS number: 171599-83-0
• Molecular Weight: 666.70 g/mol
• Formula: C28H38N6O11S

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Viamed 20 product packaging


VIAMED 20 (Sildenafil Citrate) is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate) and pulmonary arterial hypertension and improve exercise capacity in men and women. It is manufactured as 20mg tablets that contain 20mg of Sildenafil Citrate and excipients. 

Sildenafil Mechanism of Action

Cyclic guanine monophosphate (cGMP) is needed for penile arteries and smooth muscles of the penis to relax for a man to have an erection. The amount of cGMP is reduced by an enzyme called phosphodiesterase type 5. Sildenafil inhibits this enzyme so that cyclic GMP can be more abundant leading to better and longer-lasting erection. It is this same mechanism of relaxing blood vessels and smooth muscles that also makes it useful in treating pulmonary arterial hypertension.

Sildenafil Dosage

As prescribed by the physician.

Sildenafil Side Effects

Headache, stomach upset, back pain, blurred vision, cyanopsia, flushing hypertension, fatigue, UTIs, indigestion, constipation and diarrhea.

Sildenafil Interactions

Riociguat, alpha-blockers, azole antifungals, macrolides, HIV protease inhibitors, rifampin, organic nitrites and nitrates.


? Sildenafil Citrate . . . . . . . . . . . . 20mg
? Excipients . . . . . . . . . . . . . . . . . . . . . q.s

Viamed 20 back of the product pack
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