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Oral aminophylline therapy. Increased dosage requirements in children
Insights
Children require higher oral aminophylline (theophylline ethylenediamine) doses than adults for similar therapeutic serum levels due to faster theophylline clearance. Younger children eliminate theophylline more rapidly than older children.
Area of Science:
- Pharmacology
- Pediatric Medicine
- Clinical Therapeutics
Background:
- Aminophylline (theophylline ethylenediamine) is a bronchodilator used in managing respiratory conditions.
- Therapeutic drug monitoring is crucial for optimizing aminophylline efficacy and minimizing toxicity.
- Age-related differences in drug metabolism can significantly impact dosing requirements.
Purpose of the Study:
- To determine age-specific dosage guidelines for oral aminophylline therapy.
- To compare theophylline clearance rates in children and adults.
- To establish optimal dosing strategies for achieving therapeutic serum levels.
Main Methods:
- Retrospective analysis of serum theophylline levels and patient demographics.
- Calculation of apparent theophylline clearance (ATC) in milliliters per hour per kilogram (ml/hr/kg).
- Comparison of ATC values across different age groups (younger children, older children, adults).
Main Results:
- Mean ATC was significantly higher in children (84.8 ml/hr/kg) than in adults (51.4 ml/hr/kg) (P < .001).
- Younger children (1-9 years) exhibited faster theophylline elimination (93.8 ml/hr/kg) than older children (10-18 years) (77.3 ml/hr/kg).
- Predicted dosage guidelines were established: 28.0 mg/kg/day (younger children), 23.2 mg/kg/day (older children), and 15.6 mg/kg/day (adults).
Conclusions:
- Children, particularly younger ones, require higher oral aminophylline doses than adults due to increased theophylline clearance.
- Age-specific dosage guidelines can aid in initiating effective aminophylline therapy.
- Individualized patient monitoring of serum theophylline levels is recommended for optimal treatment outcomes.
Abstract:
While monitoring oral aminophylline (theophylline ethylenediamine) therapy, larger doses (milligrams per kilogram) were necessary for children than for adults to achieve similar therapeutic serum levels. The mean apparent theophylline clearance (ATC) determined in 59 children was significantly higher (P less than .001) than determined in 114 adults (84.8 versus 51.4 ml/hr/kg). Additionally, the younger children (1 to 9 years) eliminated theophylline more rapidly than the older children (0 to 18 years) (93.8 versus 77.3 ml/hr/kd). When initiating continuous oral aminophylline therapy, dosage guidelines, based on the mean ATC calculated for each group, were predicted, and trough theophylline serum levels of 10mug/ml were obtained. The guidelines for aminophylline were 28.0, 23.2, and 15.6 mg/kg/day administered in four divided doses for the younger children, older children, and adults, respectively. Monitoring of serum levels is suggested to further individualize the patient's aminophyline therapy.