Metoclopramide-Induced Neuroleptic Malignant Syndrome: A Review Study

Context: Neuroleptic malignant syndrome (NMS) has been introduced as a rare but lethal and idiosyncratic reaction to neuroleptics/antipsychotics. The most obvious risk of this syndrome is the use of neuroleptics, especially high-potency ones. Metoclopramide is also known as an anti-nausea medication administered before surgery to manage digestive problems. Evidence Acquisition: Formerly, it had been assumed that metoclopramide was a type of chlorobenzamide that was not in the phenothiazine group but free of extrapyramidal side effects (EPSs). The sequential reports of complications indicate that metoclopramide can cause EPSs and drug-induced motor side effects. A total number of 5044 articles were obtained after the initial search. Then, two researchers independently screened out their titles, and abstracts and 20 articles were finally selected based on the inclusion criteria. Results: Of the 20 articles reporting metoclopramide-induced NMS, treatments had been successful in 16 (80%) cases, but it had led to death in four (20%) patients. There were 11 and 8 male and female patients, respectively, and gender was not mentioned for a patient in one article. The age range of the patients was from six months to 84 years, and the mean age was 50.92 years. Conclusions: Although NMS following metoclopramide intake is reported very rarely, it should be considered for any psychiatric symptoms with unexpected mental changes, muscle rigidity, and fever after being treated with metoclopramide. The neuroleptic malignant syndrome can occur following multiple doses or just one dose of metoclopramide. Also, metoclopramide use in patients affected with kidney failure is accompanied by a higher risk of NMS. A previous history of NMS, a recent episode of catatonia, and severe agitation are all taken into account as risk factors in this domain.