It took a lawsuit to prompt its release, but the U.S. Department of Health and Human Services (HHS) has finally made public a lengthy FDA review explaining why it thinks marijuana should be rescheduled as a Schedule III controlled substance. Such a move would make it legal under federal law for marijuana to be used for medically approved purposes, such as pain relief.
The FDA review was completed last August, nearly a year after it was requested by President Biden. But the 252-page review was not released until Friday, after a lawsuit was filed by two pro-cannabis lawyers when HHS didn’t respond to Freedom of Information Act (FOIA) requests.
Medical marijuana is already legal in 38 states, but cannabis remains classified as a Schedule I substance by the Drug Enforcement Administration, making its sale or use illegal under federal law. The DEA is expected to make its decision on rescheduling soon.
The FDA looked at seven potential medical uses of cannabis: pain, anorexia, anxiety, epilepsy, inflammatory bowel disease (IBD), nausea, and post-traumatic stress disorder (PTSD).
After reviewing clinical studies of cannabis, and the views of academic and professional medical societies, the FDA said they found “mixed findings of effectiveness.” The strongest evidence was for pain relief, anorexia and nausea.
“The available data indicate that there is some credible scientific support for the use of marijuana in the treatment of pain.”
— FDA review
“The largest evidence base for effectiveness exists for marijuana use within the pain indication (in particular, neuropathic pain),” the FDA said. “On balance, the available data indicate that there is some credible scientific support for the use of marijuana in the treatment of pain, anorexia related to a medical condition, and nausea and vomiting, with varying degrees of support and consistency of findings.”
Perhaps just as importantly, the FDA found no evidence of “unacceptably high safety risks” when marijuana was used therapeutically. That is a key finding for marijuana to be rescheduled by the DEA. The risk of marijuana being used nonmedically was also low, compared to substances like alcohol, heroin, cocaine, prescription opioids and anti-anxiety drugs.
“The rank order of the comparators in terms of greatest adverse consequences typically places heroin, benzodiazepines and/or cocaine in the first or immediately subsequent positions, with marijuana in a lower place in the ranking, especially when a utilization adjustment is calculated. For overdose deaths, marijuana is always in the lowest ranking among comparator drugs,” FDA said.
“These evaluations demonstrate that there is consistency across databases, across substances, and over time that although abuse of marijuana produces clear evidence of a risk to public health, that risk is relatively lower than that posed by most other comparator drugs.”
The FDA said the “vast majority” of professional medical organizations do not recommend marijuana, but they don’t specifically recommend against it either. The lone exception is the American Psychiatric Association, which warns that long-term use of marijuana can worsen psychiatric conditions, such as paranoia and hallucinations.
Reclassifying marijuana as a Schedule III substance – in the same category as codeine and ketamine – would certainly be historic, but it won’t resolve the many differences between federal and state regulation of cannabis.
Under federal law, legal access to Schedule III substances requires a prescription from a licensed doctor that is dispensed from a licensed pharmacy. Medical marijuana products would also have to go through the FDA’s lengthy and costly clinical trial process to assess their safety and effectiveness. Even if they pass that test, they would only be approved by FDA for certain conditions.
