Transient alteration of theophylline half-life: possible association with Herpes simplex infection

Transient alteration of theophylline half-life resulting in theophylline neurotoxicity is reported in a nine-year-old child. The alteration in theophylline elimination half-life was associated with Herpes simplex gingivostomatitis. This association has not previously been demonstrated. The report is contrasted with a study of theophylline clearance variability in children.