Abstract
The ocular effects of two beta blocking drugs, carteolol and practolol, were assessed in beagle dogs. Practolol-treated dogs showed a tear flow reduction: histopathological examination showed lymphocytic infiltration in the lacrymal glands and electroretinogram showed a decrease in the amplitudes of the A + B-wave. By contrast, no drug-related abnormal changes were observed in carteolol-treated dogs. These results were thought to indicate that a tear flow measurement and electroretinogram examination should be used in the evaluation of the safety of beta blocking drugs.
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