... respond to re-exposurewith clinical manifestations; most of the UK popula-tion has antibodies to penicillins but, fortunately,comparatively few react clinically to penicillinadministration.Whilst ... Adrenal steroid may be useful.DIAGNOSIS OF DRUG ALLERGYThis still depends largely on clinical criteria,history, type of reaction, response to withdrawaland systemic rechallenge ... opacities occur with phenothiazines andchloroquine. Retinal injury occurs with thioridazine(particularly, of the antipsychotics), chloroquine andindomethacin.Nervous system. Tardive...