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- W2054187060 abstract "The vaginal absorption of leuprolide (a potent luteinizing hormone-releasing hormone analogue), which has the potential for producing regression of hormone-dependent tumors as well as high gonadotropin-releasing and ovulation-inducing activities, was evaluated in rats by radioimmunoassay. Gonadotropin (luteinizing hormone and follicle-stimulating hormone) release was concomitantly determined. Although leuprolide disappeared rapidly from the serum after intravenous administration (the biological half-lives were 8.4 min in the alpha-phase and 33.2 min in the beta-phase), long-lasting serum levels were observed when the analogue was administered vaginally. The vaginal absorption was enhanced by adding citric acid to the test solution. The absolute bioavailability, estimated by the AUC of serum leuprolide levels, was 25.8% over 6 h and 38.0% over 12 h in the 5% citric acid solution (pH 3.5). The sustained release of gonadotropin was also obtained after vaginal administration of the analogue. A linear dose absorption correlation of leuprolide was obtained in the range of 10-1000 micrograms/kg in an aqueous solution or methylcellulose jelly. The release of gonadotropin showed a plateau level at greater than 10 micrograms/kg, which corresponds to an effective dose for antitumor activity. The vaginal absorption of leuprolide varied with the estrous cycle, but this effect was eliminated by prior subcutaneous pretreatment with the analogue." @default.
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- W2054187060 date "1984-03-01" @default.
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- W2054187060 title "Vaginal Absorption of a Potent Luteinizing Hormone-Releasing Hormone Analogue (Leuprolide) in Rats IV: Evaluation of the Vaginal Absorption and Gonadotropin Responses by Radioimmunoassay" @default.
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- W2054187060 doi "https://doi.org/10.1002/jps.2600730304" @default.
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