Both nimodipine and flunarizine have their own side effects, but it is impossible to directly compare which drug has fewer side effects. Nimodipine belongs to the calcium antagonist, has the effect of improving cerebral vascular spasm and increasing cerebral blood supply, mainly due to the treatment of cerebral vascular spasm after cerebral hemorrhage. Adverse reactions of the drug include nausea, vomiting, headache, decreased blood pressure, accelerated heart rate and so on. Patients with cerebral edema and severe liver insufficiency should not use this drug. Flunarizine also has the effect of improving the blood supply of cerebral vessels, and can be used in the treatment of patients with dizziness and migraine. Adverse reactions to the drug include fatigue, drowsiness, burning sensation in the stomach, extravertebral reactions, etc. It is contraindicated in patients who are allergic to the components of the drug. The drug should not be used in patients with a history of depression, allergy to the product. There are differences in the main components and indications of the two drugs mentioned above, so it is not possible to directly compare which drug has fewer side effects, and the drug should be used under the guidance of a doctor.