HIV blocking pills are not useful for 2 months and are generally not effective in stopping HIV infection beyond 72 hours. AIDS blocking medication is used to prevent HIV infection after high-risk exposure. After the occurrence of high-risk contact behavior, within 2 hours of taking, can play a better blocking effect, 24 hours to take AIDS blocking drugs, can also have a certain effect, generally within 72 hours of taking, using the full cycle, can have a chance of successful blocking. If it is more than 72 hours, the virus may have spread in the patient’s body, and taking the blocking medication is no longer effective, so HIV blocking medication for 2 months is no longer useful. After HIV exposure occurs, the sooner you take the AIDS blocking drug the better the effect, you need to take 28 consecutive days, and at the same time, you have to go to the hospital regularly for review to determine whether the blocking is successful.