Compound Guaiacol Sulfonic Acid Potassium Oral Solution is used for the treatment of cough and phlegm caused by colds and allergic bronchitis. Side effects mainly include neurological symptoms, gastrointestinal symptoms, and urinary symptoms. 1. Neurological symptoms: mainly reflected in the sense of excitement than the daily increase, which leads to insomnia, dreamy, easily agitated, poor concentration, panic, etc., but also some patients manifested sleepiness, usually not very heavy, if difficult to tolerate the drug is recommended to stop immediately to seek medical help. 2. Gastrointestinal symptoms: manifested as dry mouth, gastrointestinal irritation symptoms such as abdominal cramps under the pain, a little bit of cold food is easy to diarrhea. If the symptoms are obvious, it is recommended to stop the medication and administer glutamine capsules to regulate the state of intestinal irritation. 3. Urinary symptoms: taking the drug may be difficult to urinate, the appearance of urine divergence and so on. It is recommended to exclude other prostate and other urinary tract obstructive diseases after symptomatic treatment. Compound Guaiacol Sulfonic Acid Potassium Oral Solution side effects are still other aspects, the drug contraindications include: ① allergic to any component of the product is prohibited; ② megaloblastic anemia patients are prohibited; ③ pregnant women 1 ~ 2 weeks before delivery is prohibited; ④ severe hepatic and renal insufficiency is prohibited; ⑤ newborns, infants are prohibited. It is recommended that the patient under the guidance of a physician to standardize the application, to avoid blind use of medication to avoid misunderstanding.