Verapamil is available in tablets, injections, extended-release capsules and other dosage forms, each of which has its own corresponding methods of use and precautions, the use of which includes oral intake, intravenous injection and so on. Verapamil Hydrochloride Extended-Release Tablets: Oral, the recommended dose for adults is 1~2 tablets/day, divided into 1~2 times, and the dosage is gradually adjusted according to the therapeutic effect. Verapamil Hydrochloride Injection: the starting dose is 5~10mg, diluted and slowly pushed intravenously for at least 2 minutes; drip administration of 5~10mg/h, the total amount of a day does not exceed 50~100mg, and need to be used under cardiac monitoring. Verapamil hydrochloride extended-release capsules: oral, 0.12g or 0.18g/dose/day, gradually adjust the dosage according to the therapeutic effect, the total amount of a day does not exceed 0.48g. Adverse reactions such as dizziness, headache, bradycardia, heart failure, hypotension, constipation, nausea, erythematous limb pain, and peripheral edema may occur in some patients using the drug; the drug is contraindicated in patients with allergy to the drug, cardiogenic shock, severe conduction block, sick sinus syndrome, heart failure, atrial fibrillation, and atrial flutter. As the drug has different dosage forms, the specific use of which dosage form and dosage need to be selected by clinicians according to the patient’s condition, should avoid blind use resulting in the occurrence of adverse events.