Conjunctival leucoplakia was induced by the local beta-blocker metipranolol in one case. Withdrawal of the drug and application of all-trans retinoic acid ointment resulted in resolving of the keratinisation. A striking pharmacological resemblance is discovered between metipranolol and practolol. Metipranolol seems to be a less toxic phenol derivative of practolol. Nevertheless, it seems able to act as antigen.
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Derous et al. (1989) studied this question.
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