To the Editor.— The recent review of theophylline intoxication by Sahney et al,1 was of interest to us because of our experience with patients with high theophylline blood levels but without symptoms. Five patients were seen; one patient [Figure, A(1), A(2)] had a second ingestion. Theophylline blood levels ranged from 55 µg/mL (14 hours after ingestion) to 140 µ/mL. We followed standard emergency procedures including the use of oral removal, absorption, and catharsis. We then placed the patients under close scrutiny to watch for further symptoms.