Nitrenolol is not a long-acting drug. Nitrenolol is a combination of two drugs, nitrendipine and atenolol, with two drugs in the same dosage, and is used clinically for the treatment of mild to moderate high blood pressure. Nitrendipine and Atenolol are not in a long-acting preparation and need to be taken twice a day. Nitrendipine belongs to the calcium antagonist, which has the effect of dilating peripheral blood vessels, and atenolol belongs to the beta-blocker, which also has the effect of lowering blood pressure, and the combination of the two drugs at the same time, the effect of lowering blood pressure will be increased, and the side effects will be partially offset. Adverse effects of the drug include dizziness, headache, palpitations, constipation, ankle edema, etc. It is contraindicated in patients who are allergic to the components of the drug, severe aortic stenosis, second and third degree atrioventricular block, sick sinus node syndrome, and severe bradycardia. Patients with hypertension should take Nitroxol under the supervision of a physician, master the characteristics of the drug and take the drug according to the physician’s instructions.