Cited by 139Advanced Drug Delivery SystemsHypothalamic control of reproductive hormonesHormonal and reproductive studies

Controlled release of LHRH agonist, leuprolide acetate, from microcapsules: serum drug level profiles and pharmacological effects in animals

Ogawa, Yasuaki, Okada, Hiroaki, Heya, Toshiro, Shimamoto, Tsugio·1989·Journal of Pharmacy and Pharmacology

Abstract

The pharmacokinetic behaviour of leuprolide acetate from a controlled release parenteral dosage form has been studied in rats and dogs. The release of the drug in rats after a single subcutaneous injection exhibited pseudo-zero-order kinetics for one month in doses ranging from 0.0135 to 1.35 mg/rat; the release rate at a dose of 1.35 mg/rat was 2.8% of dose/day; after intramuscular injection the response was similar. In rats, the serum leuprolide acetate levels increased sharply immediately after injection by either route as a consequence of the initial release of the drug; subsequently, the levels attained a plateau for two weeks. The serum level profiles in dogs showed essentially the same pattern as those in rats. When the dosage form was injected into rats, the serum testosterone level (a pharmacological index) sharply peaked, abruptly decreased to below the normal level, and then was sustained at a suppressed level for over six weeks at a dose of 1.35 mg/rat (equivalent to 3 mg kg-1) and higher, while the serum testosterone level after an injection of 0.0135 and 0.135 mg/rat was not sufficiently suppressed. The profiles in dogs showed essentially the same pattern as those in rats. With multiple administrations (once every 4 weeks), serum testosterone levels in dogs did not show any sharp rise after the second and third injections. Changes in rat reproductive organ weights agreed well with the serum testosterone profile in the suppression. The results demonstrate that th…

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Crossref · 10.1111/j.2042-7158.1989.tb06497.x

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Authors
Ogawa, Y., Okada, H., Heya, T., & Shimamoto, T.
Affiliations
Takeda (Japan) (JP)
Corresponding author
Ogawa, Yasuaki
Venue
Journal of Pharmacy and Pharmacology
Published
1989-07-01
Volume
41
Issue
7
Pages
439-444
ISSN
  • 0022-3573 (ISSN-L)
  • 2042-7158
OpenAlex
W2019022309
Cited by
139
References
11
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 2 · 2019: 2 · 2018: 1 · 2016: 3 · 2015: 4 · 2014: 2 · 2013: 5 · 2012: 2
FWCI
13.36
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacy and Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advanced Drug Delivery Systems
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
Keywords
leuprolide, GnRH agonist, controlled release, microcapsules, parenteral dosage forms, pharmacokinetics, serum drug concentration, testosterone suppression, gonadotropin-releasing hormone, reproductive organ weight
MeSH terms
Animals, Antineoplastic Agents, Body Weight, Capsules, Chemistry, Pharmaceutical, Delayed-Action Preparations, Dogs, Drug Compounding, Genitalia, Male, Injections, Intramuscular, Injections, Subcutaneous, Gonadotropin-Releasing Hormone, Male, Organ Size, Rats, Inbred Strains, Species Specificity, Testosterone, Time Factors, Leuprolide, Rats

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