EFFECT OF PARACETAMOL ON GASTRIC EROSIONS INDUCED BY INDOMETHACIN IN RATS
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Gastric mucosal injury induced by application of indomethacin, as a nonsteroidal anti - inflammatory drug (NSAID). is a well- documented phenomenon. This study examined the effect of acetaminophen (paracetamol) on indomethacin - induced gastric erosions. One hundred adult albino rats of both sexes, weighing 200 - 250 gm were divided into two main groups, including a group of 10 rats acts as a controL The first group was to study the effect of a single oral dose of indomethacin. paracetamol and both drugs. on the gastric mucosa. and the second group was to study the effect of repeated administration of each drug and both drugs together. The animals were killed and the histopathological changes of the stomach were examined microscopically. Single therapeutic dose of indomethacin was found to induce multiple gastric erosions which these were more marked after repeated administration of the drug. Single dose or prolonged administration of para.-etamot were followed by very minimal changes in the gastric mucosa. Simultaneous administration of both drugs was found to reduce the pathological lesions induced by indomethacin alone, whereas the pretreatment with paracetamol one hour before a single oral dose of indomethacin did not affect its erosive activity. Post - treatment with paracetamol reduces the erosive effect of indomethacin either in a single dose or after repeated administration. The pathogenesis of gastric erosions and ulcers was believed to be due to prostaglandin inhibition. Indomethacin was known as a potent inhibitor of prostaglandin synthesis. whereas paracetamol is a very weak inhibitor of prostaglandin production. It is also found that paracetamol had a protective action against the erosive effect of indomethacin and this appears to be mediated by mucosal regeneration, probably resulting from increased production of mucosal growth factors. So. the use of paractamat as antipyretic and analgesic drug is recommended instead of indomethacirt, or they are administrated siniultaneously with or after irtdomethacin when there is a possibility of gastric mucosa/ injury, especially in prolonged treatment.