It is best not to drink milk at the same time while taking medication because there may be interactions between milk and some medications, thus affecting the efficacy of the medication. Some drugs such as iron preparations, calcium tablets, tetracycline antibacterial drugs should not be taken at the same time as milk, because these drugs will form a complex with milk, affecting the absorption of the drug, thus affecting the efficacy. So it is best to drink milk after 1~2 hours of medication, do not take at the same time. Milk and drugs are not absolutely contraindicated, some drugs can be taken at the same time with milk, such as the common probiotic preparation Bacillus subtilis bifidus, can be served with <40 ℃ milk, the two will not have adverse reactions. However, most medications are best taken with warm water. Before using the medication, you should consult your doctor carefully about the use of the medication and check the precautions in the drug instructions in detail.