Drug-induced aseptic meningitis attributable to trimethoprim alone has only rarely been documented in the literature. A previously healthy adolescent male presented to our hospital with recurrent headaches, photophobia, and meningismus after serially starting and stopping trimethoprim. Cerebrospinal fluid studies revealed elevated white blood cell counts with a polymorphonuclear predominance. This case is the second documented report of trimethoprim-induced aseptic meningitis in a pediatric patient.
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