Abstract 1. 1. The literature dealing with the effects of anthelmintics on nematode metabolism is summarized. 2. 2. The compounds which are reviewed are: haloxon, metriphonate, crufomate, naphthalophos, phenothiazine, thiabendazole, parbendazole, tetramisole hydrochloride, bephenium hydroxynaphthoate, theium closylate, pyrvinium pamoate, dithiazanine iodide, methylridine, pyrantel tartrate, piperazine, and diethylcarbamazin. 3. 3. Some of the effects of these drugs on nematode metabolism are discussed.