title: Comparison of a new sustained-release theophylline preparation, TheoBeads, with Theo-Dur tablets in children with asthma.
abstract: A new, slow-release theophylline formulation for children, TheoBeads, which has the potential for once-daily dosing, has become available. We report the results of a study of pediatric patients whose medication was changed from Theo-Dur tablets b.i.d. to TheoBeads q.d. Forty-nine children with asthma (aged 6-12 years) were treated with b.i.d. Theo-Dur to produce therapeutic maximum and minimum concentration levels (i.e., 8-20 micrograms/ml). Approximately half the patients were then transferred to TheoBeads given q.d. at the same total daily dose and retitrated; seven patients needed to be changed to b.i.d. dosing due to unacceptable fluctuations. The other half of the patients continued on b.i.d. Theo-Dur. Following at least 5 days of steady-state dosing, serum theophylline levels were assayed over a 24-hour period. It was found that: 1. Children changed to q.d. TheoBeads showed no change in their overall asthma control based on clinical diary entries and peak flow measurements. 2. Lower Cmax and Cmin theophylline levels and a smaller area under the curve were noted for patients taking q.d. TheoBeads compared to those taking b.i.d. Theo-Dur. 3. Administration of TheoBeads q.d. resulted in a significantly larger overall peak-to-trough fluctuation and a higher percentage of patients with subtherapeutic theophylline levels in the second 12-hour period than did b.i.d. Theo-Dur administration. In summary, when children receiving b.i.d. Theo-Dur were transferred to q.d. TheoBeads, they did not maintain even and sustained therapeutic theophylline levels, although asthma control was not adversely affected during the short period of observation.
authors.affiliation: Allergy and Asthma Medical Group and Research Center, San Diego, California.
authors.forename: M J
authors.initials: MJ
authors.lastname: Welch
authors.forename: H A
authors.initials: HA
authors.lastname: Orgel
authors.forename: E O
authors.initials: EO
authors.lastname: Meltzer
authors.forename: J P
authors.initials: JP
authors.lastname: Kemp
authors.forename: S
authors.initials: S
authors.lastname: Gawchik
authors.forename: A R
authors.initials: AR
authors.lastname: Rooklin
authors.forename: D G
authors.initials: DG
authors.lastname: Tinkelman
mesh_terms: D001249:Asthma / Q000188:drug therapy*; D002214:Capsules; D002648:Child; D003692:Delayed-Action Preparations; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008297:Male; D013607:Tablets; D013806:Theophylline / Q000008:administration & dosage* / Q000627:therapeutic use
chemical_list: D002214:Capsules; D003692:Delayed-Action Preparations; D013607:Tablets; D013806:Theophylline