Dacronin Hydrochloride belongs to a kind of local anesthetics, which is effective for laryngeal anesthesia and lubrication during upper gastrointestinal endoscopy, etc., and needs to comply with the doctor’s prescription. Dacronine hydrochloride and menthol form a fixed combination preparation, which can be used as an adjunctive medicine for bronchoscopy, laryngoscopy, esophagoscopy, and before endotracheal intubation. Adverse reactions to dacronine hydrochloride mainly include allergic reactions such as urticaria, swelling, skin lesions, edema and central nervous system such as neuroticism, vertigo, blurred vision, postictal tremor, loss of consciousness, and somnolence. It is contraindicated for those who are allergic to this product or other components of this product. Dosage should be reduced as appropriate in patients with acute illnesses and in patients with severe damage to the mucous membranes of the digestive tract. Dacronin hydrochloride needs to be used under the guidance of a doctor, do not use it on your own to avoid delays.