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08 April 2016 : Case report  USA

Metformin-Induced Fixed-Drug Eruption Confirmed by Multiple Exposures

Unusual or unexpected effect of treatment, Unexpected drug reaction, Educational Purpose (only if useful for a systematic review or synthesis)

Carolyn J. SteberABE, Scott L. PerkinsAEF, Kira B. HarrisABE

DOI: 10.12659/AJCR.896424

Am J Case Rep 2016; 17:231-234

Abstract

BACKGROUND: A fixed-drug eruption (FDE) is a reaction characterized by cutaneous lesions that appear due to exposure to a particular drug. Barbiturates, carbamazepine, sulfamethoxazole, and tetracyclines have all been associated with causation of FDEs. Although these drugs are more commonly associated with FDEs, any introduction of a medication has the potential to result in a FDE. Metformin, a commonly used medication to improve glycemic control, has been reported to cause dermatologic reactions in some case reports, but only a single previously documented case report discusses the potential of metformin-associated FDE.

CASE REPORT: We describe a 56-year-old woman who developed a FDE with multiple exposures to metformin. Upon each exposure, small, round, erythematic lesions developed on the palms of the hands and soles of the feet; these lesions resolved each time after discontinuation of metformin. According to the Naranjo scale, there is a definite association between metformin and FDE in this case (score of 8).

CONCLUSIONS: This report contributes to the limited documented literature on metformin-induced FDE. Clinicians should be made aware of possible FDEs associated with this commonly used medication.

Keywords: Diabetes Mellitus, Type 2 - drug therapy, Drug Eruptions - etiology, Hypoglycemic Agents - adverse effects, Metformin - adverse effects

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923