<prompt> All are true about levamisole EXCEPT:Act as an immunostimulatorAct as an immunodepressor in high dosesSingle dose is sufficient for the treatment of psoriasisActs antihelminthic by causing depolarization  <response>: Levamisole- Active against many nematodes, but use is restricted to ascariasis and ancylostomiasis because the action on other worms is poor. The ganglia in worms are stimulated causing tonic paralysis and expulsion of live worms. Interference with carbohydrate metabolism inhibition of fumarate reductasemay also contribute. It is an immunostimulant, used for slow spreading vitiligo to be used for at least 6 weeks ESSENTIALs of MEDICAL PHARMACOLOGY SIXTH EDITION -KD TRIPATHI Page 812 