Possible association between ocular chloramphenicol and aplastic anaemia--the absolute risk is very low.

Abstract:

AIMS:To determine whether topical ocular chloramphenicol increases the risk of aplastic anaemia and to estimate the magnitude of this risk, if any. METHODS:Population-based prospective case-control surveillance of aplastic anaemia in a community of 4.2 million inhabitants from 1980 to 1995 (67.2 million person-years) plus case-population estimate of the risk, based on sales figures of ocular chloramphenicol in the study area during the study period. RESULTS:One hundred and forty-five patients with aplastic anaemia and 1,226 controls were included in the analysis. Three cases (2.1%) and 5 controls (0.4%) had been exposed to ocular chloramphenicol during the relevant etiological period. The adjusted odds ratio was 3.77 (95% confidence interval, 0.84-16.90). Two cases had also been exposed to other known causes of aplastic anaemia. The incidence of aplastic anaemia among users of ocular chloramphenicol was 0.36 cases per million weeks of treatment. The incidence among non users was 0.04 cases per million weeks. CONCLUSIONS:An association between ocular chloramphenicol and aplastic anaemia cannot be excluded. However, the risk is less than one per million treatment courses.

journal_name

Br J Clin Pharmacol

authors

Laporte JR,Vidal X,Ballarín E,Ibáñez L

doi

10.1046/j.1365-2125.1998.00773.x

subject

Has Abstract

pub_date

1998-08-01 00:00:00

pages

181-4

issue

2

eissn

0306-5251

issn

1365-2125

journal_volume

46

pub_type

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