The Effect of Cannabis Laws on Access to Pain Medications among Commercially Insured Patients in the United States
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The addition of cannabis to prescription drug monitoring programs and medication fills in Medicaid
To date, there is considerable evidence of the medical applications of cannabis, however concerns regarding the safety of cannabis are also mounting. To improve the safety of cannabis, nine states have added medical cannabis to their state PDMPs, helping providers to take patient cannabis use into consideration when making prescribing decisions. Across a variety of models using Medicaid State Drug Utilization claims data, I find statistically significant reductions in severely and moderately contraindicated medication fills across two outcomes. In my main specification, adding cannabis to a state PDMP is associated with a 14.4% (p < 0.01) and 7.74% (p < 0.001) decrease in the units per prescription, for severely and moderately contraindicated medications, respectively, as compared to states with legal medical cannabis dispensaries open. An interesting spillover effect of adding cannabis to PDMPs is an apparent decrease in the prescribing of scheduled narcotics, with Schedule II medications seeing a moderately significant decrease and Schedule IV medications seeing a 11.4% decrease (p < 0.01) in the prescribing rate and a 16.2% decrease (p < 0.001) in the units per prescription. The main analysis was conducted using the Borusyak et al. (2023) Imputation Estimator with a robustness check using the Callaway and Sant’Anna (2021) difference‐in‐difference. This work presents evidence that adding cannabis to a state PDMP impacts provider prescribing decisions involving medications that are contraindicated for use with cannabis as well as controlled substances. This paper demonstrates that adding cannabis to PDMPs influences prescribing and thus has the potential to make medical cannabis use safer. Conversely, this work indicates providers may have bias against patients who use cannabis and deny them life‐improving medications (like controlled ADHD medication or opioids) on the basis of medical cannabis use. This paper also contributes to the literature comparing DD outcomes estimated using Borusyak, Jaravel, and Spiess' (2023) Imputation Estimator and Callaway and Sant’Anna's (2021) DD Estimator.
The addition of cannabis to prescription drug monitoring programs and medication fills in Medicaid
To date, there is considerable evidence of the medical applications of cannabis, however concerns regarding the safety of cannabis are also mounting. To improve the safety of cannabis, nine states have added medical cannabis to their state PDMPs, helping providers to take patient cannabis use into consideration when making prescribing decisions. Across a variety of models using Medicaid State Drug Utilization claims data, I find statistically significant reductions in severely and moderately contraindicated medication fills across two outcomes. In my main specification, adding cannabis to a state PDMP is associated with a 14.4% (p < 0.01) and 7.74% (p < 0.001) decrease in the units per prescription, for severely and moderately contraindicated medications, respectively, as compared to states with legal medical cannabis dispensaries open. An interesting spillover effect of adding cannabis to PDMPs is an apparent decrease in the prescribing of scheduled narcotics, with Schedule II medications seeing a moderately significant decrease and Schedule IV medications seeing a 11.4% decrease (p < 0.01) in the prescribing rate and a 16.2% decrease (p < 0.001) in the units per prescription. The main analysis was conducted using the Borusyak et al. (2023) Imputation Estimator with a robustness check using the Callaway and Sant’Anna (2021) difference‐in‐difference. This work presents evidence that adding cannabis to a state PDMP impacts provider prescribing decisions involving medications that are contraindicated for use with cannabis as well as controlled substances. This paper demonstrates that adding cannabis to PDMPs influences prescribing and thus has the potential to make medical cannabis use safer. Conversely, this work indicates providers may have bias against patients who use cannabis and deny them life‐improving medications (like controlled ADHD medication or opioids) on the basis of medical cannabis use. This paper also contributes to the literature comparing DD outcomes estimated using Borusyak, Jaravel, and Spiess' (2023) Imputation Estimator and Callaway and Sant’Anna's (2021) DD Estimator.
Unrelenting Growth and Diversification: Using the Health and Retirement Study to Illuminate Cannabis Use Among Aging Americans
Background and Objectives Cannabis use among aging Americans continues to increase. We examine correlates of cannabis use including attitudes, state of residence, health status and service use. Research Design and Methods Using the 2018 Health and Retirement Study Cannabis module completed by 1,372 respondents aged 50 and older, we distinguished current cannabis users from those who have never used or have some prior use. We linked 2018 and 2016 core HRS data and used multinomial regressions to identify associations among current use, attitudes, place of residence, as well as current (2018) and past (2016) medical conditions, pain and sleep issues. We also examined associations among cannabis use, hospital stays and outpatient medical visits. Results Past year cannabis use reached 10.3% among aging Americans. Attitudes toward cannabis have changed over time with 4 of 5 survey respondents currently holding a favorable attitude. Attitude and state of residence were associated with current use. Cannabis users reported higher levels of pain, were more likely to use prescription opioids, and report activity limitations in both 2016 and 2018. Associations between cannabis use and sleep issues or concurrent healthcare use were not observed. Discussion and Implications Changing attitudes and state legalization appear important for late middle age and older persons, and as many as 1 of every 5 persons over 50 may be using cannabis by 2030. Cannabis use among aging Americans warrants increased attention from care providers, program administrators and policy makers, especially as a prevention or harm reduction strategy relative to prescription opioids.
Objective: Almost half of U.S. states have passed recreational cannabis laws as of May 2024. While considerable evidence to date indicates cannabis may be a substitute for prescription opioids in the treatment of pain, it remains unclear if patients are treating pain with cannabis alone or concomitantly with other medications. Method: Using data from a national sample of commercially insured adults, we examine the effect of recreational cannabis legalization (through two sequential policies) on prescribing of opioids, NSAIDS, and other pain medications by implementing synthetic control estimations and constructing case-study level counterfactuals for the years 2007-2020. Results: Overall, we find recreational cannabis legalization is associated with a decrease in opioid fills among commercially insured adults in the U.S., and we find evidence of a compositional change in prescriptions of pain medications more broadly. Specifically, we find marginally significant increases in prescribing of non-opioid pain medications after recreational cannabis becomes legal in some states. Once recreational cannabis dispensaries open, we find statistically significant decreases in the rate of opioid prescriptions (13% reduction from baseline, p < .05) and marginally significant decreases in the average daily supply of opioids (6.3% decrease, p < .10) and number of opioid prescriptions per patient (3.5% decrease, p < .10). Conclusions: These results suggest that substitution of cannabis for traditional pain medications increases as the availability of recreational cannabis increases. There appears to be a small shift once recreational cannabis becomes legal, but we see stronger results once users can purchase cannabis at recreational dispensaries. The decrease in opioids and marginal increase in non-opioid pain medication may reflect patients substituting opioids with cannabis and non-opioid pain medications, either separately or concomitantly. Reductions in opioid prescription fills stemming from recreational cannabis legalization may prevent exposure to opioids in patients with pain and lead to decreases in the number of new opioid users, rates of opioid use disorder, and related harms.
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