Dulcolax generally refers to pethidine hydrochloride, how many times a day to use is not clearly defined, mainly divided into injections, and oral tablets. There are some differences in the dosage, which must be used in strict accordance with the instructions. The use of injectable liquid 1. Labor analgesia: If it is used for labor analgesia, it is usually repeated every 4 to 6 hours as needed, and the common dosage is 25mg to 50mg. 2. Pre-anesthesia medication: If the medication is used before anesthesia, basically, the dosage is calculated according to the patient’s weight 30 minutes to 60 minutes before the operation, and the standard is 1.0 to 2.0mg/kg. 3. Paroxysm after surgery: For paroxysm after surgery, the total dosage for 24 hours should be limited to 2.1 to 2.5mg/kg according to the patient’s body weight. Oral tablets 1. Adult usual dosage: The usual dosage for adults is usually 50～100mg at one time and 200～400mg in one day. 2. Children: Children according to each kilogram of body weight is about 1.1 ~ 1.76mg at one time. 3. Cancer patients: In case of severe cancer patients, the first dose may exceed the regular dose appropriately according to the actual condition of the patient. Mild dizziness, nausea and vomiting, tachycardia, and upright hypotension may occur with the use of this drug. There are also some contraindications, such as bronchial asthma and severe pulmonary insufficiency should not be used. The medication must be used strictly according to the doctor’s instructions.