The short answer
Most adults starting medical cannabis capsules for pain begin at 2.5 mg to 5 mg of THC, taken once in the evening. If you have never used cannabis, or you know you are sensitive, start at 1 mg to 2.5 mg. Hold that dose for at least three days before changing anything. Capsules take 30 to 120 minutes to take effect and can last six to eight hours, so the single most common mistake is swallowing a second capsule an hour in because nothing has happened yet. That second capsule lands on top of the first and turns a mild evening into a rough one.
medical cannabis capsule for pain dosage
There is no universal dose. Body weight, liver enzyme activity, prior cannabis use, and the specific oil in the capsule all shift the number. What follows is a starting framework, not a prescription.
Why capsules hit differently than vaping or a tincture
Inhaled cannabis reaches the bloodstream in minutes. Swallowed cannabis has to survive stomach acid, absorb through the gut, and then pass through the liver before it reaches circulation. That liver pass converts a large share of THC into 11-hydroxy-THC, a metabolite that is more potent and longer lasting than the parent compound. Only about 6 to 20 percent of the THC in an edible or capsule ends up bioavailable, and that range is wide from person to person.
how many mg of medical cannabis capsule per day
Three practical consequences follow. Onset is slow and unpredictable. Duration is long. And a milligram of THC in a capsule does not feel like a milligram inhaled, so you cannot translate your vape dose into a capsule dose by matching numbers.
pharmaceutical cannabis capsule dosing
A step-by-step titration plan
- Pick a starting dose. 2.5 mg THC for most beginners, 1 mg to 2.5 mg if you are cannabis-naive or sensitive, 5 mg if you already use cannabis regularly.
- Pick a consistent time. Evening works well for pain because sedation is easier to sleep through than to work through.
- Take it with a meal that contains some fat. Oil-based capsules absorb better with food, though this also makes the effect stronger.
- Wait a full two hours before judging the dose. Four hours gives a clearer picture.
- Hold that dose for three days in a row. One good night or one bad night is not enough data.
- If pain relief is partial and side effects are manageable, raise by 2.5 mg. If you feel anxious, dizzy, or foggy, drop back down instead.
- Cap your increase at roughly 10 mg per step once you are past 20 mg, and stop climbing when relief arrives.
Some people land at 2.5 mg. Others need 30 mg or more. Both are normal. The goal is the lowest dose that reduces your pain without making you feel impaired during hours you need to function.
Reading the label before you dose
- Milligrams of THC per capsule, not per bottle
- Milligrams of CBD per capsule
- Total cannabinoids, which can differ from THC plus CBD
- Carrier oil, usually MCT, olive, or sunflower
- Whether the product is nano-emulsified, which speeds onset to roughly 30 to 60 minutes
- Batch date and a current certificate of analysis
CBD, THC, and ratios
CBD does not produce a high and appears to blunt some of THC's edge, which is why 1:1 and higher-CBD capsules are popular for daytime pain. Evidence for CBD alone in chronic pain is mixed and modest. Many clinicians suggest 10 mg to 50 mg of CBD per dose, sometimes more, and note that CBD can raise blood levels of THC by competing for the same liver enzymes. If you want daytime relief without impairment, a 5:1 or 10:1 CBD-to-THC capsule is a reasonable place to start.
Timing, food, and side effects to expect
Take capsules at least two hours before you need to drive, and skip driving entirely on days you raise your dose. Expect possible dry mouth, drowsiness, dizziness, slower reaction time, and occasional anxiety or a racing heartbeat. These usually fade as tolerance settles. Alcohol multiplies all of them, so keep the two apart.
Safety and drug interactions
Cannabinoids are processed by the same cytochrome P450 enzymes as many prescriptions. Blood thinners such as warfarin, the antiplatelet clopidogrel, benzodiazepines, opioids, SSRIs, and some antifungals and HIV medications can all interact. Tell your prescriber and your pharmacist exactly what you are taking, including over-the-counter products. Skip cannabis if you are pregnant or breastfeeding, and be cautious with a history of psychosis or heart conditions.
Keep a dose log
Write down date, product, THC and CBD milligrams, time taken, time of onset, peak effect, hours of relief, pain score before and after, and any side effects. Two weeks of notes will tell you more about your dose than any general guideline, and it gives your clinician something concrete to work with.