You should not drink milk within 1-2 hours after taking the medicine. The reasons for this: First, milk can significantly affect the absorption rate of drugs, especially for antibiotics such as tetracycline and oxytetracycline. At the same time for some antihypertensive drugs absorption effect will also be affected. Second, drinking milk during the process of taking medication can easily lead to the formation of a covering film on the surface of the drug, so that the calcium, magnesium and other mineral ions in the milk react chemically with the drug, thus reducing the effectiveness of the drug and causing secondary damage to the body.