The International journal on drug policy
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Int. J. Drug Policy · Nov 2017
Polydrug use and its association with drug treatment outcomes among primary heroin, methamphetamine, and cocaine users.
Polydrug use may challenge effective treatment for substance use disorders. We evaluate whether secondary substance use modifies the association between treatment and primary drug use among primary heroin, cocaine and methamphetamine (MA) users. ⋯ This study demonstrates secondary substance use moderates the temporal associations between treatment and primary drug use among primary heroin, MA and cocaine users. Disparate patterns of polydrug use require careful measurement and analysis to inform targeted treatment for polydrug users.