Cannabis Dosage for Muscle Spasms: A Starting Guide

Short answer

There is no standard cannabis dose for muscle spasms. Dose depends on THC tolerance, product form, and the cause of the spasms.

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Multiple sclerosis trials of nabiximols, an oral spray, used 2.7 mg THC plus 2.5 mg CBD per spray, up to 12 sprays per day. That is about 32 mg THC at the top dose. Older oral THC trials used 2.5 mg to 15 mg per day.

cbd for muscle spasms vs thc

US state labels set 5 mg THC in Oregon or 10 mg THC in Colorado as one serving. Health Canada guidance for new users starts at 1 mg THC or less. A common first trial for spasm relief is 1 mg to 2.5 mg THC.

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Starting steps

1. Pick one product. Record the THC and CBD content in mg per unit.
2. Take 1 mg to 2.5 mg THC. For CBD alone, start at 5 mg to 10 mg.
3. Wait. Inhaled effects peak in 10 to 30 minutes. Oral effects peak in 1 to 4 hours.
4. Do not add a second dose inside that window.
5. Increase by 1 mg to 2.5 mg every 2 to 3 days.
6. Stop when spasms ease or side effects start. Do not chase a high.

Dose ranges by product

Oral oil, tincture, capsule

Start at 1 mg to 2.5 mg THC. Onset is 30 to 120 minutes. Peak is 1 to 4 hours. Effect lasts 4 to 8 hours. Food slows absorption and raises peak blood levels.

Inhaled flower or vape

Start with one draw of 2 to 3 seconds. Onset is 1 to 10 minutes. Peak is 10 to 30 minutes. Effect lasts 1 to 3 hours. Effects arrive fast, so titration is easier.

Topical

Topicals do not reach the bloodstream in amounts that affect muscle. Evidence for spasm relief is weak.

CBD alone

Spasticity trials used 2.5 mg to 40 mg CBD per day with THC present. CBD-only doses for spasm relief are not established. Epidiolex uses 5 mg/kg to 20 mg/kg per day for seizures, a different use and a different product.

What the evidence shows

The 2017 National Academies report found substantial evidence that oral cannabinoids reduce spasticity in multiple sclerosis. Cochrane reviews found a small average benefit. Changes in spasticity scores were modest. FDA has not approved any cannabis product for muscle spasms. Dronabinol (Marinol, Syndros) is approved for chemotherapy nausea and AIDS appetite loss, not spasticity.

Track these numbers

• THC mg and CBD mg per dose
• Time of dose
• Spasm count or a 0 to 10 spasm score before and 2 hours after
• Side effects: drowsiness, dry mouth, dizziness, fast heart rate
• Sleep quality and next-morning grogginess

Lower the dose if

• Resting heart rate goes above 100 beats per minute
• You feel faint or the room spins
• Anxiety or panic starts
• You cannot stay awake

Do not drive after THC. Do not mix with alcohol, opioids, or benzodiazepines. Talk to a clinician before use if you take blood thinners, have heart disease, or are pregnant. Cannabis use in pregnancy is not recommended. Heavy use before age 25 is linked to psychosis risk in people with a family history.