Halidol injection is generically known as haloperidol decanoate injection, and the efficacy of a single injection can be maintained for about 4 weeks, depending on the sensitivity and metabolizing ability of the patient to the drug. Haloperidol Decanoate Injection is indicated for the maintenance treatment of psychosis. The drug is an extended-release dosage form, and a single dose of the drug can achieve stable efficacy for up to 4 weeks, with individual variations depending on the patient’s sensitivity and metabolism of the drug. Adverse effects include extrapyramidal reactions, somnolence, respiratory depression, etc. It is contraindicated in neurological disorders with pyramidal or extrapyramidal symptoms. The use of this drug in patients with hyperthyroidism may cause serious neurotoxic reactions, and special care must be taken when using this drug in patients on lithium. It is recommended that patients should consult a doctor when they have any discomfort, and standardize the use of medication under the guidance of a physician.