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A delayed injection-site reaction in a patient receiving extended-release naltrexone.

  • Author(s): Ahamad, Keith;
  • Korthuis, P Todd;
  • Lum, Paula J;
  • Johnson, Cheyenne;
  • Wood, Evan
  • et al.
Abstract

Background

Pharmacotherapy, such as oral naltrexone, has proven effective in treating alcohol use disorder, although medication adherence has presented challenges. Although a formulation of extended-release naltrexone for intramuscular injection has been developed to counter daily adherence issues, injection-site reactions can occur within days of depot injection.

Case

The authors report a case of an individual with alcohol use disorder who had a previously undescribed delayed injection-site reaction that occurred 11 days after injection. Subsequent challenge with the medication resulted in recurrence of the reaction.

Discussion

Although extended-release naltrexone is generally well tolerated, injection-site reactions can complicate treatment and can appear more than 10 days after medication administration.

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