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The main difference is the price, Viagra tablets are more expensive as they are branded medication. Viagra and Sildenafil are both reliable, safe, and officially-approved medications. Sildenafil is what is known as a PDE5 inhibitor, a class of drug including the similar Tadalafil (Cialis), that causes blood vessels to expand and relax. For this reason, it was originally developed as a drug for cardiac conditions, including pulmonary arterial hypertension (PAH).
There was no effect on sperm motility or morphology after single 100 mg oral doses of sildenafil in healthy volunteers (see section 4.6). There was no effect on sperm motility or morphology after single 100 mg oral doses of sildenafil in healthy volunteers (see section 5.1). Single doses of antacid (magnesium hydroxide/aluminium hydroxide) did not affect the bioavailability of sildenafil. Cases of visual defects have been reported spontaneously in connection with the intake of sildenafil and other PDE5 inhibitors (see section 4.8). Patients should be advised that in the event of any sudden visual defect, they should stop taking VIAGRA and consult a physician immediately (see section 4.3). The co-administration of PDE5 inhibitors, including sildenafil, with guanylate cyclase stimulators, such as riociguat, is contraindicated as it may potentially lead to symptomatic hypotension (see section 4.5).
A stronger CYP3A4 inhibitor such as ketoconazole or itraconazole could be expected to have greater effect than that seen with saquinavir. The results from this pilot study are shown in Table 3