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The Oregon Medical Marijuana Act (OMMA)

Read the Law

Rulemaking Updates

In 2015 and 2016, the Oregon Legislature passed several bills that make changes to marijuana laws.

Qualifying Medical Conditions

Under the OMMA, medical marijuana can be used for these medical conditions:

  • Cancer
  • Glaucoma
  • A degenerative or pervasive neurological condition
  • Post-traumatic stress disorder (PTSD)

Medical marijuana can also be used for any other medical condition or treatment that produces one or more of the following:

  • Cachexia (a weight-loss disease that can be caused by HIV or cancer)
  • Severe pain
  • Severe nausea
  • Seizures, including but not limited to seizures caused by epilepsy
  • Persistent muscle spasms, including but not limited to spasms caused by multiple sclerosis


On Nov. 3, 1998, Oregon voters approved Ballot Measure 67. The result of the "yes" vote allowed medical use of marijuana in Oregon within specified limits. It also established a state-controlled permit system. In December 1998, the Oregon Legislature passed Measure 67 into law.

The law, known as the Oregon Medical Marijuana Act, provides legal protections for qualified patients; requires a physician-written statement of the patient’s qualifying debilitating medical condition; allows for a caregiver to provide assistance; and mandates an Oregon Health Authority registration system.

In May 1999, the Oregon Medical Marijuana Program (OMMP) was created to administer the registration program under the Oregon Medical Marijuana Act. The Oregon Medical Marijuana Program is totally fee-supported. No state funds are used to support the program.

Legal Protection

  • The Oregon Medical Marijuana Act (OMMA) protects medical marijuana users in the state of Oregon who comply with its requirements from criminal prosecution for production, possession, or delivery of marijuana.
  • The OMMA neither protects marijuana plants from seizure nor individuals from prosecution if the federal government chooses to take action against patients, caregivers or growers under the federal Controlled Substances Act.
  • An Oregon Medical Marijuana card protects cardholders only within the state of Oregon.
  • Oregon cardholders are only protected in another state if that state legally accepts Oregon’s medical marijuana cards. Because medical marijuana programs vary by state, you may want to contact the state to which you are traveling for information on its laws.
  • An Oregon cardholder acts at his or her own risk when possessing, producing or delivering medical marijuana in another state without a medical marijuana card from that state.
  • Nothing in the OMMA specifically addresses whether or not you can be evicted or terminated from employment because you are a cardholder. It is up to you to decide whether or not to tell your landlord or employer that you are a cardholder.
  • If you have questions about these important issues, consult with an attorney.


  • The OMMP will only communicate directly with the patient.
  • All written requests to release information about a patient must be signed and dated by the patient.
  • The OMMP will not accept written or verbal requests for information from a caregiver, grower, or any other person or agency without the patient’s written permission.
  • The names and addresses of OMMP participants are confidential and not subject to public disclosure.
  • Law enforcement personnel may contact the OMMP only to verify whether an individual is a patient, caregiver or grower or that a location is a registered growsite address.
  • The OMMP will verify for law enforcement whether the patient, caregiver, grower, or growsite address in question is registered, or if an application is in process.
  • The OMMP will disclose patient information to others only at the specific written request of the patient.

Growing and Possession

  • An Oregon medical marijuana patient (and their caregiver, if applicable) may possess up to 6 mature plants, which must be grown at a registered growsite address, and up to 24 ounces of usable marijuana. This is different from the possession limits for recreational marijuana.
  • The OMMP cannot supply seeds, starter plants, or give advice on how to grow medical marijuana.
  • A patient may reimburse his or her grower for the cost of supplies and utilities associated with the production of his or her medical marijuana.
  • All usable marijuana, plants, seedlings and starts are the property of the patient and must be returned to the patient upon request.
  • Marijuana may be transferred by a registry identification cardholder to another registry identification cardholder as long as no consideration is paid for the transfer.