Using recreational cannabis to treat insomnia: Evidence from over-the-counter sleep aid sales in Colorado

Recreational Cannabis In Treating Insomnia

Recreational Cannabis In Treating Insomnia

Highlights

Recreational Cannabis In Treating Insomnia.

Nearly 50% of US populations suffers from sleep disturbances; if cannabis can treat insomnia, this is clinically relevant.

Colorado county-level data show OTC sleep aid sales decline with recreational cannabis access, especially for diphenhydramine and doxylamine.

The negative association between cannabis access and sleep aid sales suggests a consumer preference for cannabis.

Abstract

This study seeks to understand whether people substitute between recreational cannabis and conventional over-the-counter (OTC) sleep medications. UPC-level grocery store scanner data in a multivariable panel regression design were used to compare the change in the monthly market share of sleep aids with varying dispensary-based recreational cannabis access (existence, sales, and count) in Colorado counties between 12/2013 and 12/2014.

We measured annually-differenced market shares for sleep aids as a portion of the overall OTC medication market, thus accounting for store-level demand shifts in OTC medication markets and seasonality, and used the monthly changes in stores’ sleep aid market share to control for short-term trends. Relative to the overall OTC medication market, sleep aid market shares were growing prior to recreational cannabis availability.

The trend reverses (a 236% decrease) with dispensary entry (−0.33 percentage points, 95% CI −0.43 to −0.24, p < 0.01) from a mean market share growth of 0.14 ± 0.97. The magnitude of the market share decline increases as more dispensaries enter a county and with higher county-level cannabis sales.

The negative associations are driven by diphenhydramine- and doxylamine-based sleep aids rather than herbal sleep aids and melatonin. These findings support survey evidence that many individuals use cannabis to treat insomnia, although sleep disturbances are not a specific qualifying condition under any U.S. state-level medical cannabis law.

Investigations designed to measure the relative effectiveness and side effect profiles of conventional OTC sleep aids and cannabis-based products are urgently needed to improve treatment of sleep disturbances while minimizing potentially serious negative side effects.

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