If you want to take HIV blocking medication, you should go to your local CDC or a local tertiary care hospital to purchase the medication. However, there are some tertiary hospitals and CDCs that do not always have HIV blocking medications on hand. Some patients who have been exposed to HIV need to go to the CDC to apply for drugs, and then the CDC will apply to the higher level for the allocation of HIV blocking drugs before they can be taken. Therefore, in the clinical setting, if HIV exposure occurs, the first step is to go to a regular medical institution for application. Do not believe in the so-called online or some pharmacy propaganda of the so-called AIDS blocking drugs, it is very likely to cause AIDS blocking failure.