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Effects of Grapefruit and Pomegranate Juices on the Pharmacokinetic Properties of Dapoxetine and Midazolam in Healthy Subjects

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Abstract

Background

The package leaflet for dapoxetine, an effective treatment for premature ejaculation, includes a strict warning against coadministration with drugs or herbal remedies that strongly induce or inhibit the activity of Cytochrome P450 (CYP) 3A4 enzyme.

Objective

To assess the effects of multiple daily consumption of grapefruit juice (GFJ) and pomegranate juice (PJ) on the pharmacokinetics of dapoxetine, we conducted an open-label, three-way crossover study in 12 healthy subjects using midazolam as a probe substrate for CYP3A4.

Methods

Participants received a single oral dose of dapoxetine (60 mg) and midazolam (7.5 mg) after pretreatment with 250 ml of either water, undiluted GFJ, or PJ for three consecutive days. All subjects were monitored for adverse effects during the study period.

Results

Compared to pretreatment with water, GFJ increased the area under the plasma concentration–time curve from time zero to infinity (AUC0–∞) and peak plasma concentration (C max) of dapoxetine by 60 and 80 %, respectively, and prolonged its elimination half-life (t 1/2) by 43 %. Similar effects of GFJ on the pharmacokinetics of midazolam were observed with a significant increase in AUC0–∞ (75 %), C max (40 %), and t 1/2 (92 %). Slight but not statistically significant changes were observed in the pharmacokinetics of dapoxetine and midazolam after pretreatment with PJ. Time to reach C max (T max) did not differ among the three phases.

Conclusion

These results suggest that GFJ increases the extent of absorption and reduces clearance of dapoxetine possibly by inhibition of both intestinal and hepatic CYP3A4, whereas PJ has little effect on dapoxetine pharmacokinetics. Although the impact of GFJ on the pharmacokinetics of dapoxetine was mild, a great caution should be considered when they are concomitantly administered.

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Acknowledgments

We thank the pharmaceutical research center in Tanta University Faculty of Pharmacy for their assistance in clinical study and HPLC analysis. We thank Dr. Marina Suzuki and Dr. Ryan Gibbard for the editorial review of the manuscript.

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Authors and Affiliations

  1. Faculty of Pharmacy, Kafrelsheikh University, Kafr el-Sheikh, Egypt

    Khaled S. Abdlekawy

  2. Faculty of Pharmacy, Tanta University, Tanta, Egypt

    Ahmed M. Donia

  3. School of Pharmacy, Pacific University, 222 SE 8th Ave., Hillsboro, OR, 97123, USA

    Fawzy Elbarbry

Authors
  1. Khaled S. Abdlekawy
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  2. Ahmed M. Donia
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  3. Fawzy Elbarbry
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Correspondence to Fawzy Elbarbry.

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Funding

This work was supported in part by the Faculty Development Grant from Pacific University, and Research Incentive Grant from Pacific University School of Pharmacy (F. E.).

Conflict of interest

KSA, AMD and FE declare no conflict of interest.

Ethical approval

The study protocol was approved by the ethics committee of Tanta University in accordance with the Declaration of Helsinki and its amendments.

Informed consent

All subjects provided written informed consent before participation.

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Abdlekawy, K.S., Donia, A.M. & Elbarbry, F. Effects of Grapefruit and Pomegranate Juices on the Pharmacokinetic Properties of Dapoxetine and Midazolam in Healthy Subjects. Eur J Drug Metab Pharmacokinet 42, 397–405 (2017). https://doi.org/10.1007/s13318-016-0352-3

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