Story highlights
- Government requires several layers of approval before researchers can study marijuana
- Nearly half the states allow medical marijuana, but little is known about its long-term impact
(CNN)Dr. Sue Sisley noticed an unexpected trend among her patients. The psychiatrist works with veterans who struggle with post-traumatic stress disorder, also known as PTSD. Many don't like how they feel on all the meds they take to manage their anxiety, sleeplessness, depression and the flashbacks.
"There's
just a few medications on the market that work, and even these can be
inadequate," Sisley said. "They end up getting stuck on eight, 10, 12
different medications, and after taking so many, suddenly they're like zombies."
Some
of these patients though were starting to feel better. They also seemed
much more present. She wanted to know what was making a difference.
They told her they found an alternative to all those medicines.
They were self-medicating with marijuana.
"I
was really stunned and more and more patients were coming out of the
shadows and disclosing to me that they were having some useful
experiences with the marijuana plant," Sisley said.
She
appreciated the progress they said they were making, but like any good
scientist she didn't want to rely on anecdotal evidence. She wanted
documented proof, clinical trials of large patient populations that run
in the gold standard of a peer-reviewed journal that
marijuana was the right approach to treating PTSD, or any other ailment
for that matter. People use it to treat a variety of medical issues,
such as multiple sclerosis, arthritis, epilepsy, glaucoma, HIV, chronic
pain, Alzheimer's, cancer and others.
With
medical marijuana legal in nearly half of the states, more doctors are
wondering what impact this drug really has on people. They ask for
dosage information. They want to know about its long-term impact on
patients.
Sisley looked for answers
to these questions in medical research, but she didn't see much. When
she decided to do the studies herself and applied for federal approval,
she was met with miles of red tape and resistance -- like many other
researchers before her.
That's because marijuana is one of the tightest-controlled substances under federal law. The U.S. government considers it a Schedule I drug, meaning the Drug Enforcement Administration
considers it to have no medical value. It's right up there with heroin
and LSD. To do research on marijuana, scientists need approval from
several federal departments. And that approval is rare.
Most
marijuana studies focus on the harm caused by the plant. The studies on
its medicinal qualities are small, early stage or observational at
best. "Mainstream physicians won't come near the stuff, even if they
hear that it works, because without the research, without it approved in
legitimate practice guidelines, they are going to worry about their
license and their professionalism," Sisley said. "That's why it is key
to have randomized control trials for this to work."
A bipartisan bill -- from Rand Paul, R-Kentucky, Cory Booker, D-New Jersey, and Kirsten Gillibrand, D-New York -- called the Compassionate Access, Research Expansion, and Respect States Act of 2015 was introduced in the Senate in March
that would ease some of those restrictions and make it easier to study
the drug. But the legislation is in committee at the moment. If it does
ever pass, and scientists can begin studying the drug in earnest, there
are several areas they may target in addition to PTSD.
Here
are 10 of them, based on the ailments people commonly use medical
marijuana to treat. Again, because there is such limited research on
this topic, these areas are based on results that CNN would typically
not report on because the work is in a far too early stage to see if it
really works. But that is the point some doctors and medical researchers
are making.
AIDS/HIV
In a human study of 10
HIV-positive marijuana smokers, scientists found people who smoked
marijuana ate better, slept better and experienced a better mood.
Another small study of 50 people found patients that smoked cannabis saw
less neuropathic pain.
Alzheimer's
Medical marijuana and some of the plant's chemicals have been used to help Alzheimer's patients gain weight, and research found that it lessens some of the agitated behavior that patients can exhibit. In one cell study, researchers found it slowed the progress
of protein deposits in the brain. Scientists think these proteins may
be part of what causes Alzheimer's, although no one knows what causes
the disease.
Arthritis
A study of 58 patients using the derivatives of marijuana found they had less arthritis pain and slept better. Another review of studies concluded marijuana may help fight pain-causing inflammation.
Asthma
Studies are contradictory, but some early work suggests it reduced exercise-induced asthma.
Other cell studies showed smoking marijuana could dilate human airways,
but some patients experienced a tight feeling in their chests and
throats. A study in mice found similar results.
Cancer
Animal studies have shown some marijuana extracts may kill certain cancer cells. Other cell studies show it may stop cancer growth, and with mice, THC,
the psychoactive ingredient in marijuana, improved the impact of
radiation on cancer cells. Marijuana can also prevent the nausea that
often accompanies chemotherapy treatment used to treat cancer.
Chronic pain
Some animal and small human studies show that cannabinoids can have a "substantial analgesic effect." People widely used them for pain relief in the 1800s. Some medicines based on cannabis such as Sativex are
being tested on multiple sclerosis patients and used to treat cancer
pain. The drug has been approved in Canada and in some European
countries. In another trial involving 56 human patients, scientists saw a 30% reduction in pain in those who smoked marijuana.
Crohn's disease
In a small pilot study of 13 patients watched over three months, researchers found inhaled cannabis did improve life for people suffering from ulcerative colitis and Crohn's disease. It helped ease people's pain, limited the frequency of diarrhea and helped with weight gain.
Epilepsy
Medical marijuana extract in early trials at the NYU Langone Medical Center showed a 50% reduction in the frequency of certain seizures in children and adults in a study of 213 patients recently.
Glaucoma
Glaucoma is one of the leading causes of blindness. Scientists have looked at
THC's impact on this disease on the optic nerve and found it can lower
eye pressure, but it may also lower blood pressure, which could harm the
optic nerve due to a reduced blood supply. THC can also help preserve
the nerves, a small study found.
Multiple sclerosis
Using marijuana or some of the chemicals in the plant may help prevent muscle spasms, pain, tremors and stiffness, according to early-stage, mostly observational studies involving animals, lab tests and a small number of human patients. The downside -- it may impair memory, according to a small study involving 20 patients.
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