Name: Juvena caps.50mg in a cell. 4x2 Capsules are hard gelatinous cylindrical shapes with hemispherical ends, white. The contents of the capsules are white or white with a grayish tint powder. Release form capsules Dosage 50 mg Pharmacological action Pharmacodynamics Sildenafil is intended for oral therapy of erectile dysfunction. Under natural conditions, i.e. in the presence of sexual stimulation, it restores impaired erectile function by increasing blood flow to the penis. The physiological mechanism underlying penile erection involves the release of nitric oxide (NO) in the corpus cavernosum upon sexual stimulation. The resulting nitric oxide activates the enzyme guanylate cyclase, which leads to an increase in the level of cyclic guanosine monophosphate (cGMP), which causes smooth muscle relaxation in the cavernous body and an increase in blood flow. Product facts: Form: Capsules; Dosage: 50mg; Pack size: 50mg.