Cilnidipine is an antihypertensive drug belonging to the class of calcium channel blockers, but it has a general antihypertensive effect and obvious side effects (e.g., palpitations, hyperuricemia, etc.), so it is rarely used in clinical practice nowadays. 1. Cilnidipine is used in the treatment of hypertension. However, cilnidipine is less used in clinical antihypertensive treatment at present, because of its general antihypertensive effect, the same kind of antihypertensive drugs are nifedipine, amlodipine, etc., which have good antihypertensive effect and are widely used in clinical application. 2. Side effects of Cilnidipine are more, involving circulatory, urinary, gastrointestinal, blood and other systems, such as palpitation, hyperuricemia, urinary frequency, positive urine protein, constipation, abdominal distension, reduction of white blood cell and platelet counts and so on. 3. Note that it is contraindicated for those who are allergic to the ingredients of the drug. If you suffer from hypertension, you should use the medicine correctly under the guidance of a doctor, do not use the medicine on your own to avoid related adverse reactions.