#189 What Cannabis Really Treats: Conditions Supported by Research
#189 What Cannabis Really Treats: Conditions Supported by Research
Most claims about medical cannabis fall apart the moment you look for the study behind them. A handful don't. Below are the conditions where the evidence is strong enough that regulators approved a cannabis drug, or the biggest research reviews called the effect real.
When pain won't quit
Cannabis eases nerve pain, the burning, shooting kind that ordinary painkillers often can't touch. The effect is modest, not a cure, but a Cochrane review of 16 trials found a real edge over placebo, and the 2017 National Academies report rated chronic pain among cannabis's strongest evidence.
• 39% got at least 30% pain relief, versus 33% on placebo
• 21% got at least 50% relief, versus 17% on placeb
Supporting cancer care
This is the oldest proven use. Two THC pills, dronabinol and nabilone, have treated chemo nausea since the 1980s, and a BMJ review pooling 30 trials found they held up well against the standard drugs.
• About 38% more likely to give full relief than standard anti-nausea drugs
• Patients who had tried both preferred them two to one for their next round of chem
A proven option for MS
MS can lock muscles into painful stiffness and spasm. A mouth spray called nabiximols (sold as Sativex, about equal parts THC and CBD) is approved in Canada and most of Europe when the usual muscle relaxants aren't enough, and an analysis of randomized trials found it clearly beats placebo.
• 2.4 times more likely to respond than placebo
• About 63% had at least a 20% drop in spasticity
Proven seizure reduction
A CBD drug called Epidiolex became the first cannabis medicine the FDA fully approved, in 2018. That came after trials in two severe childhood epilepsies, Dravet and Lennox-Gastaut, where seizures had resisted everything else.
• Dravet: monthly seizures roughly halved on CBD, from about 12 to 6, while placebo barely changed
• 43% of children had their seizures cut at least in half
• Lennox-Gastaut: sudden drop seizures fell about 44% on CBD, versus 22% on placeb
Fighting appetite loss
Before CBD or nabiximols, there was dronabinol. The FDA approved it in 1992 for the appetite loss and wasting of advanced HIV, one of the first times a cannabis drug got official medical approval, on the strength of a six-week placebo-controlled trial.
• Appetite improved on dronabinol, but kept sliding on placebo
• Weight held steady instead of dropping
Signs of potential
The conditions above have the strongest evidence. These next ones have real signals behind them, just not the settled proof yet, and they're where a lot of today's research is pointed. For now, they run mostly on patient reports and small studies, so treat the numbers as early rather than final.
PTSD: Trauma survivors have used cannabis for years to dull nightmares and hypervigilance, and the data lines up with what they describe. Over a year, cannabis users were 2.57 times more likely to no longer meet the criteria for PTSD than non-users.
Sleep and insomnia: Cannabinoid blends made for sleep have posted some of the best results in this tier, though the research trials are still small. A nightly cannabis oil cut insomnia scores by about 5 points versus placebo, and added roughly an hour of sleep.
Anxiety: CBD was most studied here, and early research looks encouraging. Anxiety scores dropped in about 79% of 72 patients within the first month of taking CBD
Inflammatory bowel disease (emerging). For Crohn's, a small placebo-controlled trial found cannabis eased symptoms without healing the gut itself, which makes it more of a comfort tool than a cure. 90% of Crohn's patients found improvement with cannabis versus 40% on placebo.
The future of medical cannabis
Cannabis was hard to study for most of the last century, and now that it isn't, the distance between what patients report and what trials can prove keeps closing. So use the strong evidence where it exists and treat the rest as promising. A few years from now, the list of what cannabis treats will likely be longer, and the evidence will be stronger.
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