Marijuana is made from the dried leaves and buds of the Cannabis sativa plant. While the Food and Drug Administration (FDA) hasn't recognized or approved the use of the marijuana plant as medicine, many states have legalized marijuana for medical use.

The FDA has approved two drugs, dronabinol (Marinol, Syndros) and nabilone (Cesamet), made from synthetic forms of ingredients found in marijuana. They can be legally prescribed for the treatment of nausea and vomiting caused by chemotherapy when other treatments have failed. Dronabinol might also be used for the treatment of anorexia associated with weight loss in people with AIDS.

Medical marijuana is available as an oil, pill, vaporized liquid and nasal spray, as dried leaves and buds, and as the plant itself. The herb is typically used to treat chronic pain, nausea and vomiting associated with cancer treatment and muscle spasms.


Research on the use of marijuana for specific conditions shows:

  • Glaucoma. Marijuana might reduce the pressure in the eye caused by this eye condition. However, the effect appears to last only a few hours.
  • Nausea and vomiting associated with cancer treatment. Research has shown that an active ingredient in marijuana, tetrahydrocannabinol (THC), effectively reduces nausea and vomiting in people undergoing chemotherapy.
  • Pain. Marijuana use might reduce the intensity of shooting or burning pain often due to nerve damage (neuropathic pain) caused by HIV and other conditions.
  • Seizures. It's not clear if marijuana effectively treats seizures.
  • Spasticity. Marijuana use might reduce muscle stiffness or spasms caused by multiple sclerosis.

Our take

Yellow light: Caution


Evidence has shown that marijuana can effectively treat chemotherapy-induced nausea. It might also reduce spasticity related to multiple sclerosis and reduce the intensity of neuropathic pain.

However, marijuana use can cause cognitive impairment and should be used with caution if you have a mental health condition. In many places marijuana use is considered illegal for any purpose.

Oct. 24, 2017