Your doctor may adjust your dose as needed and tolerated. Dosing The dose of this medicine will be different for different patients. Make sure you tell your doctor if you have any other medical problems, especially: Abnormal penis, including a curved penis or birth defects of the penis—Chance of problems occurring may be increased and this medicine should be used with caution in these patients. Call your doctor right away if you have blurred vision, confusion, dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly, sweating, or unusual tiredness or weakness. If you often forget doses, it may help to set an alarm to remind you.Strengths: 25 mg, 50 mg, mg; Brand: Viagra. 50 mg, mg; Adult dosage (ages 18–64 years) Typical dosage: 50 mg, taken as needed about 1 hour before sexual . Medically reviewed by test1.ru Last updated on Applies to the following strengths: 10 mg/mL; 10 mg/ mL; 20 mg; 25 mg; 50 mg; mg Usual Adult Dose . Precautions Cost Pregnancy Birth control needs Breastfeeding For professionals Drug Images What is Viagra? Viagra is a brand-name prescription drug that’s approved to .