Scientists from Cornell found that the legalization of recreational marijuana reduces the demand for costly prescription drugs through state Medicaid programs.
They found when states legalize marijuana, the volume of prescriptions within the drug classes that align with the medical indications for pain, depression, anxiety, sleep, psychosis, and seizures strongly declines.
The research is published in the journal Health Economics and was conducted by Shyam Raman et al.
Most cannabis research has focused on the impact of medical marijuana on-demand for prescription drugs or the impact of recreational use legalization on opioid demand.
This is among the first studies to focus on the impact of legal personal-use cannabis on a broad range of prescription drugs.
In the study, the team used data from the Centers for Medicare and Medicaid Services in all 50 states from 2011 to 2019, a period that saw growth in the number of states permitting personal use of marijuana.
About 40 states have legalized medical marijuana that must be prescribed by a doctor. So far, about 20 states have legalized personal-use cannabis for all adults, but that number is likely to rise.
In those states, the team found a meaningful change in the demand for drugs used to treat sleep and anxiety disorders but no real impact on drugs used to treat nausea.
They say that the reductions in drug utilization could lead to big cost savings for state Medicaid programs.
The results also indicate an opportunity to reduce the harm that can come with the dangerous side effects associated with some prescription drugs.
But they also caution that cannabis use is not itself without harm, noting the many studies that associate it with a potential triggering of anxiety and psychoses such as schizophrenia.
Also, patients who use marijuana to treat their medical conditions may be shifting away from visiting their doctor and therein creating discontinuities in primary care.
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