Contaminated Cocaine: Docs Puzzled Before Realizing Patient's Habit

Although she said she wasn't using drugs, a hair test eventually revealed that she had both cocaine and a drug called levamisole in her system. The skin sores turned out to be due to a condition called vasculitis, which levamisole can cause, according to the report, published Aug. 26 in the journal BMJ Case Reports. Levamisole is veterinary drug used to treat parasite infections in animals, according to the Drug Enforcement Agency (DEA).