Letters

Data in drug advertisements

BMJ 1994; 308 doi: https://doi.org/10.1136/bmj.308.6926.474a (Published 12 February 1994) Cite this as: BMJ 1994;308:474
  1. E Healing
  1. Janseen Pharmaceutical, Grove, Oxfordshire OX12 0DQ

    EDITOR, - After Harrington's criticism of the use of unpublished data in drug advertisements1 and Humphreys's response2 I surveyed advertisements in the BMJ during 1993 to discover more about where drug studies are published. I analysed 48 advertisements, which contained 175 references. Fifteen advertisements (9%) referred to “data on file.” This figure is in line with results of an earlier study, which found that 11% of references …

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