The side effects of Wu Bei San are not known. Wu Bei San is composed of cuttlebone, acanthopanax and tangerine peel oil, etc. It has the efficacy of suppressing acid and relieving pain (inhibiting gastric acid and alleviating pain). It is clinically used for the treatment of gastrointestinal pain, generalized vomiting of acid, noisy (stomach feeling similar to hunger, emptiness with burning sensation) like hunger, etc. caused by liver-stomach disharmony (the functional disharmony between the ascending of the liver and the descending of the stomach and internal organs). The adverse reactions and contraindications of the drug are not clear, but it is advisable to eat a light diet, avoid irritation, and maintain emotional well-being while taking it. If you need to use Wu Bei San, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the treatment, not to take it on their own, so as not to delay the condition.