The side effects of Lore class antihypertensive drugs mainly include bradycardia, inducing asthma, affecting blood sugar and lipid levels, etc. The formal name should be called β-blockers. β-blockers are divided into two types of selective and non-selective β-blockers. Non-selective beta-blockers such as propranolol have more side effects. Non-selective beta-blockers can cause bradycardia and aggravate atrioventricular block, so they are prohibited for patients with a heart rate of less than 50 beats per minute. Non-selective beta-blockers are also prone to bronchospasm and respiratory distress, and are contraindicated in patients with a history of asthma. Non-selective beta-blockers can increase blood glucose and lipid levels, especially triglyceride levels, and are not recommended for patients with diabetes and hyperlipidemia. Since there are many restrictions on the use of beta-blockers, it is recommended to consult a professional physician at a local regular medical institution when choosing a beta-blocker for blood pressure lowering.