Pharmacological profile of a new pyrrolizine derivative inhibiting the enzymes cyclo-oxygenase and 5-lipoxygenase.

2,2-Dimethyl-6-(4-chlorophenyl)-7-phenyl, 2,3-dihydro-1H-pyrrolizine-5-yl)-acetic acid (ML 3000) is a dual inhibitor of the enzymes cyclo-oxygenase and 5-lipoxygenase in bovine and human thrombocytes and granulocytes. In animal experiments the compound has antiphlogistic, analgesic, antipyretic, antiasthmatic and antiaggregative activity at a dosage that causes no gastrointestinal damage.