The DOI matches its Crossref record, with a small difference in title or year; 11 of the 11 references it cites were found in a registry or an index.
Controlled Release of LHRH Agonist, Leuprolide Acetate, from Microcapsules: Serum Drug Level Profiles and Pharmacological Effects in Animals
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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“Consistent with previous findings (26), we found that leuprolide treatment reduced testosterone levels.”
From Puberty Blocker, Leuprolide, Reduces Sex Differences in Rough-and-Tumble Play and Anxiety-like Behavior in Juvenile Rats (2024) · cites this paper as [26]
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Metadata
- Authors
- Ogawa, Y., Okada, H., Heya, T., & Shimamoto, T.
- Affiliations
- Takeda (Japan) (JP)
- Corresponding author
- Ogawa, Yasuaki
- Venue
- Journal of Pharmacy and Pharmacology
- Publisher
- Oxford University Press (OUP)
- 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
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- 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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