By Bertha Madras April 29 2016
Each week, In Theory takes on a big idea in the news and explores it from a range of perspectives. This week, we’re talking about drug scheduling. Need a primer? Catch up here.
Bertha Madras is a professor of psychobiology at McLean Hospital and Harvard Medical School, with a research focus on how drugs affect the brain. She is former deputy director for demand reduction in the White House Office of National Drug Control Policy.
Data from 2015 indicate that 30 percent of current cannabis users harbor a use disorder — more Americans are dependent on cannabis than on any other illicit drug. Yet marijuana advocates have relentlessly pressured the federal government to shift marijuana from Schedule I — the most restrictive category of drug — to another schedule or to de-schedule it completely. Their rationale? “States have already approved medical marijuana”; “rescheduling will open the floodgates for research”; and “many people claim that marijuana alone alleviates their symptoms.”
Yet unlike drugs approved by the Food and Drug Administration, “dispensary marijuana” has no quality control, no standardized composition or dosage for specific medical conditions. It has no prescribing information or no high-quality studies of effectiveness or long-term safety. While the FDA is not averse to approving cannabinoids as medicines and has approved two cannabinoid medications, the decision to keep marijuana in Schedule I was reaffirmed in a 2015 federal court ruling. That ruling was correct.
To reside in Schedules II-V and be approved for diagnosing, mitigating, treating or curing a specific medical condition, a substance or botanical must proceed through a rigorous FDA scientific process proving safety and efficacy. Not one form of “dispensary marijuana” with a wide range of THC levels — butane hash oil, smokables, vapors, edibles, liquids — has gone through this rigorous process for a single medical condition (let alone 20 to 40 conditions).
To approve a medicine, the FDA requires five criteria to be fulfilled:
- The drug’s chemistry must be known and reproducible.Evidence of a standardized product, consistency, ultra-high purity, fixed dose and a measured shelf life are required by the FDA. The chemistry of “dispensary marijuana” is not standardized. Smoked, vaporized or ingested marijuana may deliver inconsistent amounts of active chemicals. Levels of the main psychoactive constituent, THC, can vary from 1 to 80 percent. Cannabidiol (known as CBD) produces effects opposite to THC, yet THC-to-CBD ratios are unregulated.
- There must be adequate safety studies. “Dispensary marijuana” cannot be studied or used safely under medical supervision if the substance is not standardized. And while clinical research on long-term side effects has not been reported, drawing from recreational users we know that marijuana impairs or degrades brain function, and intoxicating levels interfere with learning, memory, cognition and driving. Long-term use is associated with addiction to marijuana or other drugs, loss of motivation, reduced IQ, psychosis, anxiety, excessive vomiting, sleep problems and reduced lifespan. Without a standardized product and long-term studies, the safety of indefinite use of marijuana remains unknown.
- There must be adequate and well-controlled studies proving efficacy. Twelve meta-analyses of clinical trials scrutinizing smoked marijuana and cannabinoids conclude that there is no or insufficient evidence for the use of smoked marijuana for specific medical conditions. There are no studies of raw marijuana that include high-quality, unbiased, blinded, randomized, placebo-controlled or long-duration trials.
- The drug must be accepted by well-qualified experts. Medical associations generally call for more cannabinoid research but do not endorse smoked marijuana as a medicine. The American Medical Association: “Cannabis is a dangerous drug and as such is a public health concern”; the American Academy of Child and Adolescent Psychiatry: “Medicalization” of smoked marijuana has distorted the perception of the known risks and purposed benefits of this drug;” the American Psychiatric Association: “No current scientific evidence that marijuana is in any way beneficial for treatment of any psychiatric disorder … the approval process should go through the FDA.”
- Scientific evidence must be widely available. The evidence for approval of medical conditions in state ballot and legislative initiatives did not conform to rigorous, objective clinical trials nor was it widely available for scrutiny.