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Cimetidine-methylprednisolone-theophylline metabolic interaction
The American Journal of Medicine
|December 1, 1984
Summary
Cimetidine significantly impacts theophylline metabolism in asthma patients, reducing its clearance. However, it does not affect methylprednisolone pharmacokinetics, showing selective drug interaction effects.
Area of Science:
- Pharmacology
- Drug Metabolism
- Clinical Pharmacy
Background:
- Asthma management often involves long-term use of medications like theophylline and methylprednisolone.
- Understanding drug interactions is crucial for optimizing therapeutic outcomes and patient safety.
Observation:
- A single asthmatic patient receiving long-term theophylline and methylprednisolone was studied before and during cimetidine treatment.
- Pharmacokinetic parameters and urinary metabolites were analyzed for both drugs.
Findings:
- Cimetidine reduced theophylline plasma clearance by 30%, primarily by inhibiting 3-methylxanthine formation.
- Methylprednisolone bioavailability and plasma clearance remained unaffected by cimetidine co-administration.
Implications:
- Cimetidine demonstrates selective inhibition of drug metabolism, impacting theophylline but not methylprednisolone.
- These findings highlight the variable effects of cimetidine on key asthma medications, necessitating careful consideration in clinical practice.