Viagra is available in different doses, including 25mg, 50mg and 100mg, and the right dose depends on the person and the instructions of their doctor or medical provider. Sildenafil itself looks like a white crystalline powder. When formulated into Viagra, however, it is in the shape of blue, film-coated, rounded-diamond-shaped tablets which is how Viagra earned the popular “the little blue pill” name. Of note, the absorption of Viagra (sildenafil) after a high fat meal is reduced. Viagra was only found in the semen of people who took it orally in small quantities. Elderly patients take longer to metabolize Viagra / sildenafil and renal insufficiency did not dramatically affect the clearance of Viagra from the body. Viagra also demonstrated improved erections in people with spinal cord injuries and radical prostatectomy patients.