[A 70-year-old male exhibiting parkinsonism-hyperpyrexia syndrome during levodopa carbidopa intestinal gel (LCIG) treatment and suspected carbidopa allergy due to positive drug-induced lymphocyte stimulation test (DLST)].

A 70-year-old male who has medical history of Parkinson's disease for 26 years admitted to our hospital for trial of levodopa carbidopa intestinal gel (LCIG) therapy because of severe dyskinesia and frequent wearing-off. He developed deterioration when he was treated with one of the levodopa (LD) decacrboxylase inhibitor compounds in the past. Five days after LD had changed into equivalent dose of LD/carbidopa (CD), high fever with hyperCKemia appeared. He was diagnosed as having Parkinsonism-hyperpyrexia syndrome (PHS). Exchange of LD/CD to LD drugs improved the symptoms quickly. Four days after LCIG administration, PHS reappeared. Simultaneously, the patient developed sepsis and disseminated intravascular coagulation (DIC). Thrombocytopenia did not improve after recovery from infection and DIC. Anti-PA IgG and drug-induced lymphocyte stimulation test (DLST) against LCIG showed positive. Exchange of LCIG to LD drugs and intravenous methylprednisolone administration improved the symptoms and thrombocytopenia. CD induced type II and type IV allergy were suspected. This case offers a caution that physicians should be aware of drug allergy in cases of which unexpected symptoms occurred in altering one LD compound to another.