How long to eat after taking drugs is closely related to the type of drug and the nature of the disease, and cannot be generalized. Some drugs can stimulate the gastric mucosa after taking, long time taking can lead to gastritis, such as ibuprofen and other non-steroidal anti-inflammatory drugs. Such drugs are recommended to be taken half an hour after meals to reduce the stimulation of the drug on the gastric mucosa, play a role in protecting the gastric mucosa, to avoid prolonged use of the drug leading to stomach pain, acid reflux and other discomfort. Part of the drug taken before meals is conducive to the absorption of drugs, can make the drug to play out the maximum efficacy, such as azithromycin, roxithromycin, this kind of drug is recommended to be taken half an hour before meals. There are also some drugs that need to be taken with meals, or at a specific time, such as before bedtime. Drugs are taken in different ways, and taking them improperly can lead to a decrease in efficacy, increase side effects, or even lead to drug poisoning, so it is recommended to take the drugs under the guidance of a doctor.