If you are treating pneumonia caused by Mycoplasma pneumoniae infection, you usually choose macrolides, one of the drugs is clarithromycin, clarithromycin tablets have a good effect on resisting Mycoplasma pneumoniae, this drug mainly inhibits the reproduction of Mycoplasma and promotes its death. Usually the course of using this drug is about 14 days, after taking this drug some patients will have some adverse reactions, mainly digestive tract manifestations, nausea, vomiting, abdominal pain, diarrhea and so on. There are also some adverse reactions that are less common, there are headache, abnormal taste, and even liver function impairment, such as elevated transaminases, etc. Generally, patients with allergic reactions to this drug should not use it.