Do not drink grapefruit juice if you’re taking sildenafil Revatio for pulmonary hypertension. Some people may also have ringing in their ears tinnitus or dizziness. The possible categorical responses to these questions were 0 no attempted intercourse, 1 never or almost never, 2 a few times, 3 sometimes, 4 most times, and 5 almost always or always. Brian Staiger Pharm. Sildenafil at steady state, at a dose not approved for the treatment of erectile dysfunction 80 mg t. Lastly, although sildenafil is considered interchangeable with brand Viagra, they do have slightly different inactive ingredients.In addition to Viagra, REX MD also offers brand-name Cialis and generic Cialis (tadalafil). Both Viagra and sildenafil are available in mg, mg, and mg doses. VIAGRA is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or mg of sildenafil. Tablets are debossed with PFIZER on one side and VGR25, VGR50 or VGR on the other to indicate the dosage strengths. Close.  · See a doctor if you notice any of the following uncommon or rare side effects when you take Teva sildenafil: sharp or burning chest pain that gets worse over time. pain in your bladder. stomach.