Short answer
Two FDA-approved THC medicines, dronabinol and nabilone, are prescribed for chemotherapy-induced nausea and vomiting and for appetite loss in AIDS-related wasting. Whole-plant medical cannabis is used off-label for the same symptoms. The evidence is strongest for nausea and vomiting and weaker for appetite and weight gain. Cannabis does not treat the cause of nausea or weight loss. Seek medical care if nausea lasts more than a few days, you vomit blood, you cannot keep fluids down, or you lose weight without trying.
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Prerequisites
- A qualifying diagnosis under your state medical cannabis program
- A clinician who has your full medication list
- A state-issued medical cannabis card or written certification
- A notebook or app for symptom and dose records
- A scale and a fluid intake log if weight loss is a concern
How to use medical cannabis for nausea and appetite loss
- Get a qualifying evaluation. Ask your clinician to document the symptom you are treating, its cause, and how often it occurs. A vague reason makes later dose adjustments guesswork.
- Review drug interactions before your first dose. THC and CBD affect liver enzymes in the CYP450 family, which can change blood levels of warfarin, some chemotherapy agents, anti-seizure drugs, opioids, benzodiazepines, and certain antidepressants. Bring your full list to the appointment.
- Choose one target symptom. Nausea relief and appetite stimulation respond to different doses and timing. Track them as separate scores so you can tell which one is improving.
- Pick a delivery route. Inhaled or vaporized cannabis starts in 5 to 15 minutes and lasts 2 to 3 hours, which makes titration easier. Oral oils, capsules, and edibles start in 30 to 120 minutes and last longer, so overdosing is more common with them.
- Start low. For oral products, begin at 2.5 mg THC or less and wait a full 2 hours before adding more. For inhaled products, take one small puff and wait 15 minutes.
- Time the dose around meals. Take oral cannabis 30 to 60 minutes before eating, or inhale 10 to 15 minutes before eating, so peak effect lands when food is in front of you.
- Balance THC with CBD. THC activates CB1 receptors and drives hunger. CBD is not an appetite stimulant, though it may soften THC-related anxiety. High CBD doses can also raise THC blood levels, so change one product at a time.
- Record each session. Note product name, THC and CBD milligrams, route, time, nausea score, appetite score, and side effects. Keep the log for at least two weeks before judging results.
- Watch for cannabinoid hyperemesis syndrome. Repeated vomiting, cramping belly pain, and relief from hot showers point to this condition. Stop cannabis and get medical care.
- Reassess with your clinician in 2 to 4 weeks. Bring the log. Adjust the dose, switch the route, or stop the trial based on what the record shows.
What to expect
Common side effects include dry mouth, dizziness, drowsiness, and short-term memory trouble. Tolerance to appetite effects can build with daily use, and stopping suddenly after heavy use may cause irritability, poor sleep, and reduced appetite for several days. Cannabis can also impair driving and balance, so avoid driving after a dose until you know how it affects you.
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Safety notes
Do not use cannabis to mask nausea from a condition that needs treatment, such as bowel obstruction, pancreatitis, or a medication reaction. People with a history of psychosis, severe heart disease, or cannabis use disorder should discuss risks with a clinician first. Keep all products locked away from children and pets, and store oral products where they cannot be mistaken for regular food.