Ambroxol is mainly used for the treatment of cough and phlegm caused by lung diseases. Contraindications include pregnant and lactating women, patients with glaucoma, patients with hepatic and renal insufficiency and patients with allergies and lactose intolerance, and patients with gastric ulcers. 1. Pregnant women and lactating women: the drug should be used with caution during pregnancy, especially in the first trimester. Pregnant women and lactating women are a special group of people, and the use of medication is not only related to themselves, but also to the baby, so the drug should be used with caution. 2. Glaucoma patients: Ambroxol can increase intraocular pressure, so it should be used with caution in patients with glaucoma. 3. Patients with hepatic or renal insufficiency: Ambroxol may cause a slight decrease in hepatic or renal function, so it should be used with caution in patients with hepatic or renal function. 4. Allergic patients: patients who are allergic to the ingredients in Ambroxol Hydrochloride Oral Solution are prohibited from using it. 5. Lactose intolerant patients, gastric ulcer patients: gastric ulcer patients will worsen nausea, stomach pain symptoms after taking, lactose intolerant patients will also increase the symptoms of diarrhea. Ambroxol and some drugs can interact with each other, so if you are using other drugs, you should inform your doctor before using Ambroxol to avoid causing adverse reactions.