[Severe neurological toxicity (coma, convulsions, distal motor neuropathy) secondary to the association of accidental poisoning by isoniazid and a protocol containing high doses of vincristine].

Authors report the case of a 19 year old metastatic Ewing's sarcoma, prophylactically treated for suspected tuberculosis by Rifampicin and INH. Hepatic failure was induced by accidental overdose of INH. A high dose containing VCR protocol associated, lead to a coma with convulsions and severe motor peripheral neuropathy partially regressive. Neurological incidents of VCR, INH and their association are reviewed.