The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. Patients taking concomitant inhibitors of CYP3A4 may benefit from initiation at the lower dosage. Furthermore, sildenafil use requires caution in patients with anatomical deformation of the penis and patients with conditions potentially predisposing them to priapism, such as sickle cell anemia or multiple myeloma. It is not indicated for children. Dose-related visual disturbances occurred more frequently at toxic levels, while blood pressure changes showed a low correlation. This site is intended only for U. It continues to work for up to 4 hours, although its action is usually less after 2 hours. · Viagra ( mg) Pfizer Limited: Tablet View Price: Vigra ( mg) Pfizer Limited: Tablet View Price: Vigreks ( mg) Medley Pharmaceuticals Ltd. Tablet View Price: Vogira ( mg. Viagra comes as an oral tablet in different dosages. Discuss with your doctor what’s an appropriate dose for you. For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets. Sildenafil is available as oral tablets of 25 mg, 50 mg, and mg strength for erectile dysfunction (ED). In the treatment of PAH, sildenafil is available in tablets 20 mg, oral suspension 10 mg/mL, and injectable 10 mg/ mL forms. The recommended dosage for tablet and oral suspension formularies is 5 mg or 20 mg three times daily, 4.