PMID- 36237763 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20221015 IS - 2168-8184 (Print) IS - 2168-8184 (Electronic) IS - 2168-8184 (Linking) VI - 14 IP - 9 DP - 2022 Sep TI - An Unusual Association Between Metformin and Nightmares: A Case Report. PG - e28974 LID - 10.7759/cureus.28974 [doi] LID - e28974 AB - Metformin remains the oral drug of choice for patients with type 2 diabetes mellitus (T2DM). It is an ideal anti-diabetic drug for maintaining good glycemic control in diabetics. However, the side effect profile of metformin varies from minor or no effects to substantial impact on the GI tract. In addition, metformin is rarely known for its association with nightmares. Here we present the case of a newly diagnosed 40-year-old diabetic who developed recurrent nightmares within a week of starting metformin treatment. The patient had no previous history of psychiatric or sleep disorders. However, it was the first time he had experienced such recurrent nightmares, especially after the start of 500 mg metformin thrice a day. Based on the Naranjo Adverse Drug Reaction (ADR) Probability Scale, and sudden onset and disappearance of nightmares after metformin initiation and discontinuation made metformin the primary cause of his nightmares. CI - Copyright (c) 2022, Voloshyna et al. FAU - Voloshyna, Diana AU - Voloshyna D AD - School of Medicine, University of Michigan, Ann Arbor, USA. FAU - Sandhu, Qudsia I AU - Sandhu QI AD - Medicine, Ghazi Khan Medical College, Dera Ghazi Khan, PAK. FAU - Khan, Saima AU - Khan S AD - Internal Medicine, Sir Syed College of Medical Sciences for Girls, Clifton, PAK. FAU - Bseiso, Anan AU - Bseiso A AD - College of Medicine, Al-Quds University, Jerusalem, PSE. FAU - Mengar, Jaina AU - Mengar J AD - Medicine and Surgery, Government Medical College and New Civil Hospital, Surat, IND. FAU - Nayudu, Nirupama AU - Nayudu N AD - Internal Medicine, Zhengzhou University, Zhengzhou, CHN. FAU - Kumar, Rajesh AU - Kumar R AD - Medicine and Surgery, Jinnah Sindh Medical University, Karachi, PAK. FAU - Khemani, Deepa AU - Khemani D AD - Medicine and Surgery, Jinnah Sindh Medical University, Karachi, PAK. FAU - Usama, Muhammad AU - Usama M AD - Neurology, Sheikh Zayed Medical College, Rahim Yar Khan, Rahim Yar Khan, PAK. LA - eng PT - Case Reports DEP - 20220909 PL - United States TA - Cureus JT - Cureus JID - 101596737 PMC - PMC9548325 OTO - NOTNLM OT - abnormal dreams OT - bizzare and vivid dreams OT - diabetes OT - metformin OT - metformin side effects OT - nightmares COIS- The authors have declared that no competing interests exist. EDAT- 2022/10/15 06:00 MHDA- 2022/10/15 06:01 PMCR- 2022/09/09 CRDT- 2022/10/14 02:55 PHST- 2022/09/09 00:00 [accepted] PHST- 2022/10/14 02:55 [entrez] PHST- 2022/10/15 06:00 [pubmed] PHST- 2022/10/15 06:01 [medline] PHST- 2022/09/09 00:00 [pmc-release] AID - 10.7759/cureus.28974 [doi] PST - epublish SO - Cureus. 2022 Sep 9;14(9):e28974. doi: 10.7759/cureus.28974. eCollection 2022 Sep.