Sildenafil is the generic equivalent of Viagra® and is used to treat erectile dysfunction and pulmonary arterial hypertension. Sildenafil is the active ingredient in Viagra®. Sildenafil, in doses ranging between 25mg and 100mg, starting dosage is usually 50mg but depends on the individual and prescription history.
Vardenafil is the generic equivalent for Levitra®. Vardenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an erection. Vardenafil is the active ingredient in Levitra®. Dosages range from 10mg to 20mg. Starting dosage is usual 10mg.