There is no single correct dose of cannabis for pain. Response depends on your body, the product, and how you take it. What clinicians and experienced budtenders agree on is a starting range and a slow climb from there. For oral THC, that start is 2.5 to 5 mg. For inhaled flower or vape, it is one or two puffs. For CBD on its own, 25 to 50 mg per day is a common floor, and some pain research goes far higher.
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Why one number does not exist
Two people can take the same 10 mg edible and have opposite experiences. Liver enzyme activity, tolerance, body composition, and genetics all shift how much THC reaches your bloodstream. Pain type matters too. Nerve pain, inflammatory joint pain, and muscle spasm each respond differently, and some respond poorly to cannabinoids at any dose.
Clinical trials give a rough anchor. In meta-analyses of cannabinoids for chronic pain, the doses that showed modest benefit clustered around 5 to 10 mg of THC equivalent, often with CBD alongside it. That is a reference point, not a prescription.
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Starting points by method
- Inhaled flower or vape: one to two puffs, roughly 2 to 3 mg THC. Effects arrive in 2 to 10 minutes, peak around 15 to 30 minutes, and fade in 2 to 4 hours. Easy to titrate because you feel each step.
- Oral edibles and capsules: 2.5 to 5 mg THC. Onset takes 30 to 120 minutes, peak hits at 2 to 4 hours, and the whole thing can run 6 to 8 hours. Wait a full two hours before adding more.
- Sublingual tinctures: 2.5 to 5 mg THC. Somewhere between inhaled and edible, with onset around 15 to 45 minutes.
- Topicals and patches: dose is not standardized and absorption is local. Useful as an add-on for a specific knee, shoulder, or low back area.
- CBD isolate or broad spectrum: 25 to 50 mg per day, split into two doses, is a reasonable start for inflammation or general ache.
The THC to CBD ratio
A 1:1 ratio is the most common starting blend for pain. CBD can soften the anxious edge of THC without erasing the analgesic effect for many users. Nabiximols, the prescription spray studied in multiple sclerosis and cancer pain trials, delivers about 2.7 mg THC and 2.5 mg CBD per spray, which is close to 1:1.
Some people do better with CBD dominant products during the day and THC dominant at night for sleep. Others find CBD does nothing for their pain and stay with THC alone. There is no rule that says you need both.
How titration works
The method is boring and it works. Pick one product and one delivery route. Keep everything else stable, including your other medications and your sleep. Start at the low end. Hold that dose for three to seven days before changing anything. Then step up by 2.5 mg oral or one puff inhaled.
Score your pain from 0 to 10 before each dose and again two hours later. Note sleep quality and whether you could do things you normally avoid. The right dose is the lowest one that drops your pain by about two points or improves what you can actually do.
When more works against you
Cannabinoids are biphasic. Low doses tend to calm and dull pain. Push too high and you get anxiety, a racing heart, nausea, and a sharper awareness of every ache in your body. Edible overdoses are the classic version of this, and they last hours because there is no way to un-eat it.
High daily THC also builds tolerance fast. The dose that worked in week one may do nothing by week four, which pushes people to escalate. Rotating in CBD, taking days off, or switching methods can slow that down.
Things that change the math
- Age and liver function. Older adults and anyone with liver concerns should start at half the standard low dose.
- Drug interactions. Cannabis affects CYP450 enzymes, which can shift blood levels of warfarin, clobazam, some antidepressants, and opioids. Tell your prescriber.
- Label accuracy. Testing studies have found edible products that contained more or less THC than the package claimed. Buy from licensed shops with batch testing.
- Driving and machinery. Skip it on any dose that makes you feel altered.
If your pain is not improving after a few weeks of careful titration, that is useful information. Cannabis is not the right tool for every kind of pain, and a doctor or a pharmacist who understands cannabinoids can help you decide what comes next.