For drinking coffee, we should pay more attention to the reaction with drugs. The most important thing to be careful of is ephedrine, which can stimulate nerve excitement. If coffee is added, the effect will be greatly enhanced, resulting in the symptoms of "overdose". Cold medicines containing ephedrine are very common.
In addition, the metabolism of many drugs will interact with the metabolism of caffeine. Some of these effects increase the effect of caffeine (including side effects), some increase the effect of drugs, and some decrease the effect of drugs. The dosage of medicine is designed according to the effect of normal use, whether it is enhanced or weakened, it will affect the treatment. There are so many drugs that can interact with caffeine that most people probably can't remember them. Therefore, the simplest way is: don't drink coffee while taking various drugs.