different drugs have different curative effect time after acting on the body. viagra can generally exert its efficacy for about 4 minutes after acting on the body, which refers to the specific time after being used according to the correct dosage. If the initial dosage is relatively small, the efficacy time after using the drug is generally about 3 minutes, so this product is recommended to be taken within half an hour to one hour before sexual intercourse. In this way, the problem of men can be better solved.