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Interaction between grapefruit juice and praziquantel in humans
Nelly Castro1, Helgi Jung, Roberto Medina
1Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico. nnct@hotmail.com
Antimicrobial Agents and Chemotherapy
|April 18, 2002
Summary
Grapefruit juice significantly increases praziquantel plasma concentrations after a single oral dose. This interaction may affect praziquantel efficacy and safety, highlighting the importance of patient counseling regarding concurrent medication use.
Area of Science:
- Pharmacology
- Drug Interactions
- Clinical Pharmacy
Background:
- Praziquantel is a crucial anthelmintic drug.
- Understanding drug interactions is vital for optimizing praziquantel therapy.
- Grapefruit juice is known to inhibit cytochrome P450 enzymes, potentially affecting drug metabolism.
Purpose of the Study:
- To investigate the effect of grapefruit juice on the pharmacokinetics of praziquantel.
- To determine if co-administration with grapefruit juice alters praziquantel absorption or elimination.
Main Methods:
- A single oral dose of praziquantel was administered to participants.
- Participants received either water or 250 ml of grapefruit juice with praziquantel.
- Plasma concentrations of praziquantel were measured over time to determine pharmacokinetic parameters.
Main Results:
- Grapefruit juice significantly increased the area under the concentration-time curve (AUC) of praziquantel.
- The maximum concentration in plasma (Cmax) of praziquantel was significantly higher when taken with grapefruit juice compared to water.
- No significant differences were observed in the time to maximum concentration or elimination half-life.
Conclusions:
- Grapefruit juice enhances the absorption of praziquantel.
- This pharmacokinetic interaction could potentially alter praziquantel's therapeutic effect and safety profile.
- Clinicians should consider this interaction when prescribing praziquantel, especially in patients consuming grapefruit products.