HIV blocking drugs generally range from tens to hundreds of dollars. Most blocking drugs may cause gastrointestinal discomfort, but there are differences in actual prices and side effects. 1. Lamivudine: the price of this drug usually ranges from 10 to 200 dollars, and there are differences in its specifications and regions. Patients taking the drug may experience side effects such as rash, hair loss, fatigue, fever, vomiting, epigastric pain, diarrhea, etc. Some patients may also experience headache, insomnia, coughing and other symptoms. Meanwhile, anemia, thrombocytopenia, hyperlactatemia, peripheral neuropathy, rhabdomyolysis, etc. may also occur in a few patients. 2. Emtricitabine: The price of this drug usually ranges from 200 to 1,000 dollars. Some patients may experience side effects such as headache, nausea, diarrhea, rash, etc. Some patients may also show arthralgia, myalgia, vertigo, abnormal breathing, etc. It may also induce depression, insomnia, rhinitis, etc. 3. Atazanavir: the drug is generally from 120 dollars, and there are certain regional, specifications and other differences. And patients taking the drug may appear headache, diarrhea, nausea, lumbago, jaundice, insomnia and other side effects, some patients can also appear rash, dizziness, myalgia and other phenomena. Blocking drugs are now more categories, and there are constantly new drugs on the market, it is recommended that patients consult a physician to determine the specific drug, to clarify its price and side effects, the use of drugs need to strictly comply with the doctor’s instructions.