Short answer
The FDA has approved no THC product for arthritis. No standard dose exists. Clinicians who recommend THC start low, raise the dose in small steps, and stop if pain does not drop within 2 weeks. Trial doses sit in a narrow band: 2.5 mg to 10 mg THC per dose, 1 to 3 times a day.
Why no fixed number exists
THC binds CB1 receptors in the brain and CB2 receptors on immune cells. Response varies with body weight, liver enzyme activity (CYP2C9 and CYP3A4), tolerance, and prior use. A dose that cuts pain in one person does nothing in another.
Does Cannabis Rebuild Cartilage in Joints? What the Evidence Shows
A common titration sequence
- Day 1: 2.5 mg THC. Take it at home, in the evening. No driving.
- Days 2 to 4: hold at 2.5 mg if pain drops 2 or more points on a 0 to 10 scale.
- Days 5 to 7: if relief is partial, add 2.5 mg. Cap the dose at 5 mg.
- Week 2 onward: raise by 2.5 mg every 3 to 5 days. Most trial protocols stop at 10 mg per dose.
- Stop if there is no relief at 10 mg, or if side effects appear.
Form and timing
- Inhaled: onset in 5 to 10 minutes, peak at 15 to 30 minutes, effect lasts 2 to 4 hours.
- Oral: onset in 30 to 90 minutes, peak at 2 to 4 hours, effect lasts 6 to 8 hours.
- Oromucosal spray (nabiximols): 2.7 mg THC per spray. Trials allowed up to 12 sprays a day, and some up to 24.
Oral THC gives a weaker, longer effect. Half-life runs 25 to 36 hours. Effects stack across doses.
arthritis pain cannabis patch review
What trials found
A 2006 trial in Rheumatology gave nabiximols to 58 people with rheumatoid arthritis. Pain on movement fell. Morning pain fell. A 2005 study reported a similar result. Reviews in 2018 and 2020 called the total evidence weak: small samples, short follow-up, unclear blinding. Osteoarthritis data are thinner than rheumatoid arthritis data.
Dose ceiling and side effects
THC follows a biphasic curve. Low doses cut pain. High doses can raise pain and anxiety. Side effects include dizziness, dry mouth, fast heart rate, memory problems, and sedation. Vomiting that eases with hot showers points to cannabinoid hyperemesis syndrome. Stop and get care.
Interactions to check
- Warfarin, clopidogrel, and other drugs cleared through CYP2C9 or CYP3A4.
- Opioids, benzodiazepines, and alcohol: added sedation and fall risk.
- Age 65 and over: lower start dose, higher fall risk.
Tracking
Log the dose, the time, the pain score before and 2 hours after, and any side effects. Bring the log to a clinician. Cannabis use disorder affects about 3 in 10 users, per NIDA.
Legal status
THC remains Schedule I under federal law. State medical cannabis programs set their own rules. Insurance does not cover it.