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  1. G Y H Lip,
  2. R E Ferner
  1. West Midlands Centre for Adverse Drug Reaction Reporting, Dudley Road Hospital, Birmingham B18 7QH.

    EDITOR, - T A Roper advocates that in cases of poisoning with the calcium antagonist diltiazem the drug's concentration should be measured, even though the assay is available only in specialised centres.1 Roper suggests that there is a correlation between clinical sequelae and the diltiazem concentration after overdose. Concentrations of the calcium antagonists do not, however, usually correlate well with clinical outcome …

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