M-blockers, also known as anticholinergics, are widely used in clinical practice and include drugs such as atropine and scopolamine. They also have an inhibitory effect on glands and can inhibit the secretion of sweat glands, salivary glands, and respiratory glands, and can be used for preanesthetic administration. M-blockers can also be used for the treatment of chronic arrhythmias, such as sinus bradycardia, conduction block, etc. It can release the conduction block caused by vagal excitation, thus playing a role in accelerating the heart rate. In addition, it can also be used for acute organophosphorus pesticide poisoning.