Pre-anesthetic medication is generally divided into the following points: 1, anticholinergic drugs: can reduce respiratory secretions, keep breathing, and can prevent vagal excitation, so as to avoid bradycardia or arrest, commonly used drugs are atropine 0.5mg and scopolamine 0.3mg, half an hour before anesthesia intramuscular injection, because the drugs can inhibit sweat gland secretion or affect cardiovascular activity, so for hyperthyroidism, hyperthermia, tachycardia patients should not be used, 2, hypnotic drugs: sedative, hypnotic, anticonvulsant effect, and can prevent and treat the poisoning reaction of local anesthetics, commonly used sodium phenobarbital 0.1g, half an hour before anesthesia intramuscular injection; 3, sedative drugs: to make emotional stability, anxiolytic, anticonvulsant, and has a central muscle relaxation effect, there is a certain anti-local anesthetic poisoning effect, commonly used diazepam 5-10mg or haloperidol 5mg, or haloperidol 5mg, and the effect of local anesthetics. 10mg or haloperidol 5mg, half an hour before surgery intramuscular injection; 4, analgesic drugs: improve the pain threshold, strengthen the effect of anesthesia, reduce the amount of anesthetics or reduce visceral pull reaction, commonly used drugs are morphine or pethidine, take morphine 5-1Omg subcutaneous injection, pethidine 50-1OOmg intramuscular injection, such drugs have a suppressive effect on the respiratory center, morphine effect is stronger, children, the elderly, caution, pregnant women Pregnant women are not allowed to use.