What Makes Viagra Work?
Viagra is the brand name for Sildenafil. It is a prescription medication used to treat erectile dysfunction or impotence. It is a phosphodiesterase 5 inhibitor. Viagra can help men who have difficulty maintaining an erection. Function Viagra works by slowing down the action of the phosphodiesterase enzyme, which may cause an erection to be lost quickly. By inhibiting the enzyme, blood flow is increased to the penis and an erection lasts longer than it normally would without the medication. Time Frame According to the Mayo Clinic, Viagra typically begins working about 30 minutes after ingesting the medication. It may continue to work for another 2 to 4 hours afterward. Considerations Men under the age of 65 are typically prescribed a dosage of 50 mg; those over age 65 are generally prescribed a dosage of 25 mg. Effects Common side effects of Viagra include diarrhea, upset stomach, muscle pain, headache, flushing, breathing difficulty, sneezing, nasal congestion and insomnia. Warning Via
