Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment

Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levo...
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Autor*in:	Gutwinski, Stefan [verfasserIn] Schoofs, Nikola Stuke, Heiner Riemer, Thomas G. Wiers, Corinde E. Bermpohl, Felix

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2016

Schlagwörter:	Opioid Tolerance Long-term Maintenance treatment

Anmerkung:	© Gutwinski et al. 2016

Übergeordnetes Werk:	Enthalten in: Harm reduction journal - London : BioMed Central, 2004, 13(2016), 1 vom: 16. Feb.
Übergeordnetes Werk:	volume:13 ; year:2016 ; number:1 ; day:16 ; month:02

Links:	Volltext

DOI / URN:	10.1186/s12954-016-0095-0

Katalog-ID:	SPR028775465

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520			\|a Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances.
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allfields	10.1186/s12954-016-0095-0 doi (DE-627)SPR028775465 (SPR)s12954-016-0095-0-e DE-627 ger DE-627 rakwb eng Gutwinski, Stefan verfasserin aut Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Gutwinski et al. 2016 Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. Opioid (dpeaa)DE-He213 Tolerance (dpeaa)DE-He213 Long-term (dpeaa)DE-He213 Maintenance treatment (dpeaa)DE-He213 Schoofs, Nikola aut Stuke, Heiner aut Riemer, Thomas G. aut Wiers, Corinde E. aut Bermpohl, Felix aut Enthalten in Harm reduction journal London : BioMed Central, 2004 13(2016), 1 vom: 16. Feb. (DE-627)388089350 (DE-600)2146691-9 1477-7517 nnns volume:13 year:2016 number:1 day:16 month:02 https://dx.doi.org/10.1186/s12954-016-0095-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2016 1 16 02
spelling	10.1186/s12954-016-0095-0 doi (DE-627)SPR028775465 (SPR)s12954-016-0095-0-e DE-627 ger DE-627 rakwb eng Gutwinski, Stefan verfasserin aut Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Gutwinski et al. 2016 Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. Opioid (dpeaa)DE-He213 Tolerance (dpeaa)DE-He213 Long-term (dpeaa)DE-He213 Maintenance treatment (dpeaa)DE-He213 Schoofs, Nikola aut Stuke, Heiner aut Riemer, Thomas G. aut Wiers, Corinde E. aut Bermpohl, Felix aut Enthalten in Harm reduction journal London : BioMed Central, 2004 13(2016), 1 vom: 16. Feb. (DE-627)388089350 (DE-600)2146691-9 1477-7517 nnns volume:13 year:2016 number:1 day:16 month:02 https://dx.doi.org/10.1186/s12954-016-0095-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2016 1 16 02
allfields_unstemmed	10.1186/s12954-016-0095-0 doi (DE-627)SPR028775465 (SPR)s12954-016-0095-0-e DE-627 ger DE-627 rakwb eng Gutwinski, Stefan verfasserin aut Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Gutwinski et al. 2016 Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. Opioid (dpeaa)DE-He213 Tolerance (dpeaa)DE-He213 Long-term (dpeaa)DE-He213 Maintenance treatment (dpeaa)DE-He213 Schoofs, Nikola aut Stuke, Heiner aut Riemer, Thomas G. aut Wiers, Corinde E. aut Bermpohl, Felix aut Enthalten in Harm reduction journal London : BioMed Central, 2004 13(2016), 1 vom: 16. Feb. (DE-627)388089350 (DE-600)2146691-9 1477-7517 nnns volume:13 year:2016 number:1 day:16 month:02 https://dx.doi.org/10.1186/s12954-016-0095-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2016 1 16 02
allfieldsGer	10.1186/s12954-016-0095-0 doi (DE-627)SPR028775465 (SPR)s12954-016-0095-0-e DE-627 ger DE-627 rakwb eng Gutwinski, Stefan verfasserin aut Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Gutwinski et al. 2016 Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. Opioid (dpeaa)DE-He213 Tolerance (dpeaa)DE-He213 Long-term (dpeaa)DE-He213 Maintenance treatment (dpeaa)DE-He213 Schoofs, Nikola aut Stuke, Heiner aut Riemer, Thomas G. aut Wiers, Corinde E. aut Bermpohl, Felix aut Enthalten in Harm reduction journal London : BioMed Central, 2004 13(2016), 1 vom: 16. Feb. (DE-627)388089350 (DE-600)2146691-9 1477-7517 nnns volume:13 year:2016 number:1 day:16 month:02 https://dx.doi.org/10.1186/s12954-016-0095-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2016 1 16 02
allfieldsSound	10.1186/s12954-016-0095-0 doi (DE-627)SPR028775465 (SPR)s12954-016-0095-0-e DE-627 ger DE-627 rakwb eng Gutwinski, Stefan verfasserin aut Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment 2016 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Gutwinski et al. 2016 Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. Opioid (dpeaa)DE-He213 Tolerance (dpeaa)DE-He213 Long-term (dpeaa)DE-He213 Maintenance treatment (dpeaa)DE-He213 Schoofs, Nikola aut Stuke, Heiner aut Riemer, Thomas G. aut Wiers, Corinde E. aut Bermpohl, Felix aut Enthalten in Harm reduction journal London : BioMed Central, 2004 13(2016), 1 vom: 16. Feb. (DE-627)388089350 (DE-600)2146691-9 1477-7517 nnns volume:13 year:2016 number:1 day:16 month:02 https://dx.doi.org/10.1186/s12954-016-0095-0 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2016 1 16 02
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Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. 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author	Gutwinski, Stefan
spellingShingle	Gutwinski, Stefan misc Opioid misc Tolerance misc Long-term misc Maintenance treatment Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment
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topic_title	Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment Opioid (dpeaa)DE-He213 Tolerance (dpeaa)DE-He213 Long-term (dpeaa)DE-He213 Maintenance treatment (dpeaa)DE-He213
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title	Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment
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title_full	Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment
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title_sort	opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment
title_auth	Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment
abstract	Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. © Gutwinski et al. 2016
abstractGer	Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. © Gutwinski et al. 2016
abstract_unstemmed	Background This study aimed to investigate the development of opioid tolerance in patients receiving long-term methadone maintenance treatment (MMT). Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. Tolerance development did not differ significantly between the two substances. © Gutwinski et al. 2016
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title_short	Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment
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author2	Schoofs, Nikola Stuke, Heiner Riemer, Thomas G. Wiers, Corinde E. Bermpohl, Felix
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Methods A region-wide cross-sectional study was performed focusing on dosage and duration of treatment. Differences between racemic methadone and levomethadone were examined. All 20 psychiatric hospitals and all 110 outpatient clinics in Berlin licensed to offer MMT were approached in order to reach patients under MMT fulfilling the DSM IV criteria of opiate dependence. In the study, 720 patients treated with racemic methadone or levomethadone gave information on the dosage of treatment. Out of these, 679 patients indicated the duration of MMT. Results Treatment with racemic methadone was reported for 370 patients (54.5 %), with levomethadone for 309 patients (45.5 %). Mean duration of MMT was 7.5 years. We found a significant correlation between dosage and duration of treatment, both in a conjoint analysis for the two substances racemic methadone and levomethadone and for each substance separately. These effects remained significant when only patients receiving MMT for 1 year or longer were considered, indicating proceeding tolerance development in long-term treatment. When correlations were compared between racemic methadone and levomethadone, no significant difference was found. Conclusions Our data show a tolerance development under long-term treatment with both racemic methadone and levomethadone. 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Opioid tolerance in methadone maintenance treatment: comparison of methadone and levomethadone in long-term treatment

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