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  • Poster presentation
  • Open Access

Multiple drug hypersensitivity associated with severe cutaneous adverse reaction

  • 1,
  • 2 and
  • 1
Clinical and Translational Allergy20144 (Suppl 3) :P135

https://doi.org/10.1186/2045-7022-4-S3-P135

  • Published:

Keywords

  • Public Health
  • Omeprazole
  • Drug Reaction
  • Initial Period
  • Allopurinol

Background

Multiple Drug Hypersensitivity (MDH) was first described by Sullivan et al in 1989 as drug allergies to two or more chemically different drugs proven by in-vivo or in-vitro testing. Pichler et al added to this description by suggesting that there are two subtypes of MDH: one where sensitisation to different drug classes may occur simultaneously; the other, sequentially - sometimes even years apart.

Methods

We describe three patients matching the description of MDH.

Results

We described three patients, aged 47, 68 and 75 with a history of severe cutaneous adverse reaction (SCAR) to non-antibiotic medication (two of the cases were to allopurinol and the other was to omeprazole). All three later developed an exanthem ( 4 to 37 months later) to penicillin-based antibiotics that they were exposed to during the period of 5 to 20 days of their initial SCAR. 1 patient had a positive patch test to the antibiotic.

Conclusion

Our findings support the hypothesis that concomitant sensitisation to medication(s) given at or around the time of a previous severe cutaneous drug reaction results in multiple drug hypersensitivity syndrome. New or unnecessary medication should be avoided in the initial period following SCAR.

Authors’ Affiliations

(1)
Singapore General Hospital, Dermatology Unit and Allergy Clinic, Singapore
(2)
Singapore General Hospital, Dermatology Unit, Singapore

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