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Analgesic compositions containing buprenorphine

a technology of compositions and buprenorphine, which is applied in the field of analgesic compositions, can solve problems such as side effects of buprenorphin

Inactive Publication Date: 2006-03-16
RECKITT BENCKISER HEALTHCARE (UK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent text describes the discovery that small amounts of buprenorphine can be enhanced by small amounts of naloxone, naltrexone, or nalmefene. This enhancement is a synergistic interaction, meaning that the drugs work better together than they do separately."

Problems solved by technology

However, buprenorphine suffers from side effects typical of opiate agonists such as nausea and vomiting, constipation and respiratory depression in some patients, although there is a ceiling to its effects on respiratory depression as a direct consequence of its partial agonist properties.

Method used

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  • Analgesic compositions containing buprenorphine
  • Analgesic compositions containing buprenorphine
  • Analgesic compositions containing buprenorphine

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] The effects of buprenorphine and buprenorphine / naloxone at weight ratios of 20:1 and 15:1 were determined at various doses of buprenorphine expressed as μg / kg of body weight of the drug administered subcutaneously to rats (n=3).

[0046] The results of these tests are given in FIG. 1. The potentiation of sub-clinical doses of buprenorphine by low dose naloxone can be clearly seen from the graph of FIG. 1. Both of the buprenorphine / naloxone combinations showed marked increases in pain withdrawal latencies at both weight ratios where the buprenorphine dose was 1.25 μg and 2.5 μg, compared to buprenorphine alone which had no significant effect at these dosage levels.

example 2

[0047] Buprenorphine was administered to rats (n=6) at a dosage level of 2.5 μg / kg of body weight of the rats. Buprenorphine was co-administered subcutaneously with either naloxone or naltrexone at various weight ratios ranging from 5:1 to 30:1. In order to provide appropriate baseline points naloxone and naltrexone alone were also administered subcutaneously to rats at the same dosage levels as those used in the combined treatments.

[0048] The results are given in FIG. 2 from which the potentiation of the sub-clinical doses of buprenorphine by naloxone or naltrexone can be clearly seen.

example 3

[0049] To investigate the duration of action of several ratios (10:1, 15:1 and 20:1 buprenorphine:naloxone, with a fixed dose of buprenorphine) the effect on PWL was followed over a 26 hour period following subcutaneous injection. The results are given in FIG. 3 from which it can be seen that the effect was already maximal after 40 minutes and then decreased sharply over 6 hours. However at 26 hours a residual effect was still visible, although this was not statistically significant. The maximal effect of each ratio (40 min) was compatible with the results shown in FIG. 2. The effect observed with the 10:1 ratio combination was not statistically significant.

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Abstract

An analgesic composition in parenteral unit dosage form or in a unit dosage form suitable for delivery via the mucosa comprising an amount of buprenorphine which is less than the clinical dose required to achieve pain relief and an amount of naloxone such that the ratio by weight of buprenorphine to naloxone is in the range of from 12.5:1 to 27.5:1, or an amount of naltrexone or nalmefene such that the ratio by weight of buprenorphine to naltrexone or nalmefene is in the range of from 12.5:1 to 22.5:1. The analgesic action of the buprenorphine is potentiated by the low dose of naloxone, naltrexone or nalmefene.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This is a divisional of application Ser. No. 10 / 145,284 filed on 15 May 2002, which is a continuation-in-part of Application No. PCT / GB00 / 04372 filed on 17 Nov. 2000 and published in the English language on 25 May 2001 as WO 01 / 35942 A2. PCT / GB00 / 04372 is a continuation-in-part of U.S. Provisional Application No. 60 / 176,208 filed on 14 Jan. 2000.FIELD OF THE INVENTION [0002] The present invention relates to analgesic compositions, containing buprenorphine and, in particular, to compositions which contain buprenorphine at a sub-clinical analgesic dose level in combination with naloxone, naltrexone or nalmefene. BACKGROUND OF THE INVENTION [0003] Buprenorphine (International Non-proprietary Name for N-cyclopropylmethyl-7α-[1-(S)-hydroxy-1,2,2-trimethylpropyl]6,14-endoethano-6,7,8,14-tetrahydro-nororipavine) has been shown in clinical trials to be a potent opiate partial agonist analgesic lacking the psychotomimetic effects found with other...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/485A61K9/02A61K9/00A61K9/08A61K9/20A61K45/06A61K47/02A61K47/26A61P25/04
CPCA61K9/0019A61K9/0056A61K9/006A61K31/485A61K45/06Y10S514/812A61K47/26A61K47/02Y10S514/811A61K2300/00A61P25/00A61P25/04A61P29/00
Inventor CHAPLEO, CHRISTOPHER BOURNEVAREY, NICHOLAS CALVERTMCCORMACK, KEITH
Owner RECKITT BENCKISER HEALTHCARE (UK) LTD
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