If you are exposed to HIV in your daily life within 72 hours, you can save yourself by taking oral HIV blocking medication. Although there is no clinically effective cure for HIV, timely awareness of the risk of HIV infection, starting to take HIV blocking drugs within 72 hours and adhering to the full course of treatment can effectively inhibit HIV replication, and the earlier the drug is used, the higher the possibility of successful blocking. First, to clarify the risk of infection, we must first clarify whether there is a risk of HIV infection. HIV is mainly transmitted through blood, mother-to-child and sexual contact, so if you just eat and work with HIV patients, you usually don’t have to worry about being infected. However, if there are high-risk factors, such as high-risk sexual behavior, being scratched or stabbed by instruments used by AIDS patients, or having injections, blood donations, blood transfusions, etc. in informal medical institutions, you need to be alert to the possibility of HIV infection; Second, active treatment 1. When contaminating the eye and other mucous membranes, use a large amount of 0.9% sodium chloride solution to rinse the mucous membranes repeatedly; when there is a wound, gently squeeze the wound from the proximal end to the distal end, squeeze out the blood from the injury as much as possible, then rinse the wound with soap solution and flowing water, and then disinfect the wound locally with 75% alcohol or 0.5% iodophor; 2. If HIV infection is confirmed, the HIV virus will first enter the bloodstream and then lymphocytes, monocytes and macrophages to invade the human immune system. The earlier the HIV blocking drug is used, the higher the chance of successful blocking. If possible, the drug should be administered within 2 hours if possible. If this is not possible, it is best to administer the drug within 24 hours, usually no more than 72 hours, and it needs to be taken for 28 consecutive days. When you suspect that you are at risk of HIV infection, you should seek medical attention or go to a nearby CDC as soon as possible, explain the situation to the staff, and take the HIV blocking medication as prescribed. The clinical recommendation is generally to take emtricitabine tenofovir tablets in combination with dolutegravir sodium tablets or raltegravir potassium tablets, or a combination of integrase inhibitor/emtricitabine/propofol tenofovir, which needs to be applied under the guidance of a physician. It is important to note that during the course of taking HIV blocking drugs, it is important to take them according to the regimen and throughout the course. Some people may experience nausea, diarrhea, headache, insomnia, loss of appetite and other adverse drug reactions during the medication, which are normal. After taking the medication, it is also necessary to follow the doctor’s prescription for antibody testing to clarify the presence of infection. Although HIV can be blocked by timely medication, the best way to avoid HIV infection is good prevention. Refuse to have high-risk sex, wear condoms throughout sex, and be clean. Also, do not share needles, toothbrushes, razors and other items with others, and do not go to informal medical places for injections, tooth extraction, ear and eye piercing, eyebrow tattooing, acupuncture and other operations to strictly eliminate the possibility of HIV infection.