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Pharmacokinetics of a new theophylline liquid in asthmatic children
Insights
This study on pediatric asthma found that a 6 mg/kg theophylline loading dose may be insufficient for acute treatment. Increasing the dose to 7 mg/kg and considering 6-hourly dosing may improve therapeutic outcomes.
Area of Science:
- Pediatric Pharmacology
- Respiratory Medicine
- Clinical Pharmacy
Background:
- Acute asthma attacks in children require effective bronchodilator therapy.
- Theophylline is a commonly used bronchodilator, but optimal dosing for pediatric acute asthma remains a focus of research.
- New theophylline formulations necessitate pharmacokinetic evaluation to ensure safe and effective use.
Purpose of the Study:
- To evaluate the pharmacokinetics of a new theophylline liquid formulation in children with acute asthma.
- To determine the adequacy of a 6 mg/kg loading dose and subsequent maintenance regimen.
- To assess the achievement of therapeutic serum theophylline levels and identify potential dose adjustments.
Main Methods:
- Eleven children with acute asthma received an initial loading dose of 6 mg/kg theophylline liquid.
- A maintenance dose of 6 mg/kg was administered every 8 hours for 3 days.
- Serum theophylline concentrations were measured after the initial dose (day 1) and at steady-state (day 5).
- Time to peak serum concentration and peak-to-trough differences were analyzed.
Main Results:
- The mean peak serum theophylline concentration on day 1 was 58.9 +/- 4.5 mumol/l, suggesting the loading dose might need to be higher (approx. 7 mg/kg).
- Peak serum levels were reached at 96 +/- 7.5 min on day 1 and 71 +/- 5.5 min on day 5.
- While many children maintained therapeutic levels with 8-hourly dosing, significant peak-to-trough fluctuations indicated potential need for 6-hourly administration.
- Minor side effects were observed in five children during steady-state treatment.
Conclusions:
- The initial loading dose of 6 mg/kg theophylline liquid may be suboptimal for acute pediatric asthma treatment.
- Consideration should be given to increasing the loading dose to approximately 7 mg/kg.
- The 8-hourly dosage schedule may require adjustment to 6-hourly intervals to minimize peak-to-trough variations and optimize therapeutic efficacy in children.
Abstract:
Eleven children suffering from an acute asthma attack were treated with 6 mg theophylline/kg given as a single dose of a new theophylline liquid (Nuelin Liquid, Riker) (day 1). After the initial treatment, 6 mg theophylline per kg body weight was given to the children on an 8-hourly dosage schedule for 3 days. Multiple serum theophylline measurements were made after the initial treatment and again during a steady-state, dose interval (day 5). The mean peak serum theophylline concentration of 58.9 +/- 4.5 mumol/1 on day 1 showed that the initial loading dose should be increased to about 7 mg theophylline per kg when the liquid is used in acute treatment. Peak serum levels were achieved in 96 +/- 7.5 min (day 1) and 71 +/- 5.5 min (day 5). Under steady-state conditions, serum theophylline levels could be maintained continuously within the therapeutic range during the 8-hourly dosage interval in many children. However, the observed peak-to-trough differences indicated that it may be necessary to use 6-hourly dosages. On day 1 no side-effects were observed but five children suffered from minor side-effects during the steady-state treatment.