There is no single dose of cannabis that works for everyone with multiple sclerosis (MS) pain. Most clinical guidance says to start with a small amount of THC, often 1 to 2 mg, or one spray of a nabiximols-type product, then increase over days or weeks. CBD doses often start around 10 to 25 mg. The right amount depends on your pain type, your other medications, and how you react.
Medical Cannabis MS Dosage: Starting Doses and Titration
What the research actually shows
The strongest evidence for cannabis and MS pain comes from nabiximols, an oromucosal spray with roughly equal parts THC and CBD. In trials, people titrated up to a maximum of 12 sprays per day, which delivers about 32 mg THC and 30 mg CBD. The American Academy of Neurology says oral cannabis extract and THC may help MS spasticity and central pain, but evidence for smoked cannabis is insufficient. A Cochrane review found moderate-quality evidence for nabiximols in MS spasticity and neuropathic pain. Nabiximols is not FDA approved in the United States, so most people here use flower, oils, or edibles instead.
Cannabis for Multiple Sclerosis Research: What Studies Show
Starting doses by method
- Inhalation (flower or vape): one or two puffs of a low-THC product, then wait 10 to 15 minutes. Many people find 1 to 3 mg THC per session is enough for pain relief.
- Oromucosal spray (nabiximols-type): one spray at night, increase by one spray per day as tolerated. Trials capped at 12 sprays daily.
- Edibles: 2.5 to 5 mg THC, wait 1 to 2 hours before taking more. Edibles can last 6 to 8 hours.
- Oil or tincture: 1 to 2 mg THC under the tongue, or 10 to 25 mg CBD. Hold for 60 to 90 seconds.
How to titrate without overshooting
- Start with the lowest dose you can measure. For THC, that means 1 to 2 mg.
- Wait the full onset time for your method before redosing. Inhaled: 10 to 15 minutes. Oral: 1 to 2 hours.
- Increase by the same small amount every 2 to 3 days, not every dose.
- Keep a log of dose, time, pain score, and side effects. A 30 to 50 percent pain reduction is a realistic goal.
- Stop increasing when side effects appear or pain relief is steady.
THC, CBD, or both?
THC is the compound most linked to MS spasticity and central pain relief. CBD may help with inflammation and anxiety, but it has less direct evidence for MS pain. Some people do better with a balanced ratio, such as 1:1 THC to CBD. Others prefer mostly CBD during the day and a small amount of THC at night. There is no rule that fits all. Try one variable at a time so you know what is helping.
Safety and side effects to watch
Common side effects include dizziness, dry mouth, drowsiness, and mental fog. These are more likely with higher THC doses or when cannabis is combined with baclofen, clonazepam, opioids, or alcohol. Cannabis can raise heart rate and lower blood pressure, so stand up slowly. Do not drive or operate machinery after use. Avoid cannabis during pregnancy. Some people with MS also have bladder or balance issues that cannabis can worsen.
Talk to your neurologist first
This is general information, not medical advice. Your neurologist knows your MS type, your spasticity pattern, and your current prescriptions. Ask about drug interactions and whether a legal cannabis product is right for you. If you do try it, start lower than you think you need and go from there.