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Short-term effects of Garcinia cambogia extract on the pharmacokinetics of lamotrigine given as a single-dose in Wistar rats

Sandra Ventura, Márcio Rodrigues, Amílcar Falcão, Gilberto Alves
Food and Chemical Toxicology 2019 March 30
30940594
Garcinia cambogia supplements are widely used for weight loss. Knowing that epilepsy patients are at greater risk of developing overweight/obesity, the investigation of herb-drug interactions involving antiepileptic drugs of narrow therapeutic index is fully justified. This work was planned to assess potential pharmacokinetic-based interactions between G. cambogia extract and lamotrigine (LTG) through two independent pharmacokinetic studies. In the first study (co-administration study), rats were orally co-administered with a single-dose of G. cambogia extract (821 mg/kg) and LTG (10 mg/kg). In the second study (pre-treatment study), rats were orally pre-treated for 14 days with G. cambogia extract (821 mg/kg/day), being LTG administered (10 mg/kg) on the 15th day. Rats of the control groups received water instead of the extract. Following LTG administration, blood samples were collected until 96 h post-dose, and plasma LTG concentrations were determined and submitted to a non-compartmental analysis. Globally, no statistically significant effects were identified in the co-administration study of G. cambogia extract and LTG. In the 14-day pre-treatment study, a statistically significant decrease in the rate of systemic exposure to LTG and an increase of apparent volume of distribution were found. Even so, a minor or no clinical impact is expected from the administration of G. cambogia dietary supplements and LTG.

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