Impact of Medicare prescription drug (Part D) coverage expansion on utilisation and financial burden of benzodiazepines among older adults: an interrupted time series analysis.

Conclusions After Medicare Part D coverage expansion, there was a sudden increase in the utilisation of benzodiazepines and a decreasing trend in the long-term.

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When assessing the annual rate of non-benzodiazepines, there was an increasing trend during the pre-expansion period.

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