Non-steroid antirheumatic drugs inhibit the synthesis of prostaglandin, which results in a reduction in the efficacy of the gastric mucosal barrier. The transmural electric potential difference of the stomach wall would appear to be a useful criterion for mucosal barrier function. After 4 weeks of treatment with Indomethacin, Azapropazpone, Diclofenac or Phenylbutazone, a significant reduction in the gastric potential difference as compared with the pre-treatment measurement was observed. Accordingly, non-steroid antirheumatics give rise to a reduction in the functional efficacy of the mucosal barrier.
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