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WHILE the inhibitory effect of metyrapone on the biosynthesis of adrenal corticosteroid hormones is well known, the drug has not been tested for central actions. The present study is aimed at finding out the direct central action of metyrapone, if any, employing feeding behaviour as a test parameter. Low doses of metyrapone (10–1000 ng) administered via an i.c.v. route reduced the food intake in a dose dependent manner; the effect was functionally antagonized by concomitant administration of anti-CRF antisera. The results reveal for the first time, that metyrapone might be capable of exerting a direct action on the adrenal cortex.