Methadone dose and heroin use during maintenance treatment

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Abstract
A retrospective study examined the association between methadone dose and in-treatment heroin use as measured by fixed-interval urine testing in a cohort of 62 patients admitted to an Australian maintenance program. Urinalysis and methadone dose data were collected on subjects for a maximum two years and were analysed using Zeger & Liang's (1986) method for modelling longitudinal data. While allowing for patient descriptors and the time period in which urine samples were collected, the relative odds of using heroin were reduced by 2% for every 1 mg increase in the maintenance dose of methadone. It is estimated that the odds of patients maintained on 40 nig of methadone using heroin mere 2.2 times those of patients maintained on 80 mg.

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