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Disposition of four drugs in malnourished children
Insights
Protein-energy malnutrition (PEM) in children alters drug metabolism, slowing the elimination of drugs like antipyrine and acetaminophen. Nutritional rehabilitation improves these pharmacokinetic changes within weeks.
Area of Science:
- Pharmacology
- Pediatrics
- Nutritional Science
Background:
- Protein-energy malnutrition (PEM) significantly impacts physiological processes in infants and children.
- Altered drug metabolism and disposition are known complications of malnutrition.
- Understanding these pharmacokinetic changes is crucial for effective therapeutic management.
Purpose of the Study:
- To investigate the pharmacokinetic profiles of antipyrine, chloramphenicol, acetaminophen, and sulphadiazine in pediatric patients with PEM.
- To assess the impact of PEM on drug absorption, elimination, and bioavailability.
- To evaluate the effects of nutritional rehabilitation on drug pharmacokinetics.
Main Methods:
- Pharmacokinetic analysis of antipyrine, chloramphenicol, acetaminophen, and sulphadiazine in children with PEM.
- Comparison of drug half-life, absorption rate (ka), and elimination rate constant (ke) between malnourished and control groups.
- Monitoring pharmacokinetic parameters before and after a 6-8 week period of nutritional rehabilitation.
Main Results:
- Increased antipyrine plasma half-life in PEM suggests altered hepatic microsomal enzyme activity.
- Slower absorption (ka) and elimination (ke) rates for chloramphenicol and sulphadiazine in PEM, leading to higher bioavailability.
- Acetaminophen showed unaffected absorption but slower elimination and prolonged half-life in PEM.
- Significant improvements in chloramphenicol, antipyrine, and acetaminophen pharmacokinetics were observed after nutritional rehabilitation.
Conclusions:
- PEM markedly alters the pharmacokinetics of several common drugs in pediatric patients.
- Nutritional status plays a critical role in drug disposition and requires consideration in therapeutic dosing.
- Nutritional rehabilitation can effectively reverse or improve these drug metabolism abnormalities.
Abstract:
Pharmacokinetic studies on antipyrine, chloramphenicol, acetaminophen, and sulphadiazine have been carried out in infants and children suffering from protein-energy malnutrition (PEM). Increased antipyrine plasma half-life in PEM indicated altered mixed oxidative microsomal enzyme activity in hepatocytes. Chloramphenicol was absorbed (ka) as well as eliminated (ke) at slower rates in PEM. The net result was that the comparative bioavailability of the drug was higher in PEM as compared to the control. Observations were similar in the case of sulphadiazine. The rate of absorption (ka) of acetaminophen was not affected in children with PEM, but the elimination rate constant was slower and plasma half-life prolonged. Noticeable improvement was observed within 6-8 weeks of nutritional rehabilitation with respect to chloramphenicol, antipyrine, and acetaminophen pharmacokinetics.