Viagra is taken one hour before sexual activity. Some form of sexual stimulation is needed for Viagra to work.

For most men, the recommended initial dose of Viagra is 50 mg but depending on your individual tolerance, the dosage may be increased up to 100 mg or decreased to 25 mg. Do not take Viagra more than once daily. Do not take Viagra within 24 hours of taking any other ED prescription medication.

Taking Viagra with a high fat meal may reduce its absorption and effectiveness. Viagra does not protect against sexually transmitted diseases.