Bitter mouth after taking medicine may be caused by the following reasons: 1, oral lesions: observe whether the oral cavity is suffering from gingivitis, swollen and painful gums and other inflammatory manifestations. You can ask a dentist to conduct an oral examination, and if it is the above-mentioned performance, you may need oral local treatment and anti-inflammatory treatment; 2, abnormal gastrointestinal motility function: bile reflux caused by the action of drugs can be regulated by drugs to normalize the peristaltic function. For example, morpholine can promote the peristalsis of the gastrointestinal tract to avoid bile reflux due to retrograde peristalsis to reach the gastrointestinal and esophageal tract, and the clinical symptoms of bitter mouth; 3, drug factors: some drugs are more bitter, which may lead to bitter mouth and other uncomfortable feelings. After taking drugs with bitter mouth, it is necessary to take corresponding treatment measures according to different reasons so that clinical symptoms can be fully improved and disappear.