Her father, her mother said on the phone, had fallen into a coma after his kidneys failed in response to a sulfa drug.
sulfa drug n.
Any of a group of synthetic organic compounds, derived chiefly from sulfanilamide, chemically similar to PABA and capable of inhibiting bacterial growth and activity by interfering with the metabolic processes in bacteria that require PABA. Also called sulfonamide.
See under sulfonamide.