Cannabis Dosage for Severe Pain: How to Start

Quick answer

For severe pain, begin with 2.5 to 5 mg of THC by mouth, or one to two puffs of inhaled flower. Wait the full onset window, then add 2.5 mg every 2 to 3 days until pain falls by at least 30 percent. Inhaled doses work for flares; oral doses cover the day. Do not pass 10 mg of THC in a single oral dose without a clinician who knows your history.

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Before you begin

• A written pain score for today, on a 0 to 10 scale.
• A notebook or phone note for dose, time, and effect.
• Products with THC and CBD milligrams printed on the label.
• Clearance from your prescriber if you take opioids, benzodiazepines, blood thinners, or seizure drugs.
• A person who can check on you during your first few sessions.

Step-by-step dosing plan

1. Pick one route for the first week: inhaled for breakthrough pain, oral for steady coverage.
2. Set a starting dose. Inhaled: one to two puffs of a 15 to 20 percent THC flower. Oral: 2.5 mg THC.
3. Write down the time and your pain score right after the dose.
4. Wait the full onset window before any second dose. That is 15 minutes for inhaled and 90 minutes for oral.
5. Score the pain again. If it has not moved, hold the same dose for 2 to 3 days.
6. Raise the oral dose by 2.5 mg only after those 2 to 3 days pass with no relief.
7. Stop at the lowest dose that drops your pain by 30 percent or more.
8. Keep that dose for one week and track side effects such as dry mouth, fog, or fast heartbeat.

Inhaled versus oral for severe pain

Inhaled cannabis reaches the blood in 5 to 15 minutes, peaks near 30 minutes, and fades in 2 to 3 hours. Oral cannabis can take 30 to 120 minutes to start and 6 to 8 hours to clear. That gap matters with severe pain. A common plan pairs a low oral dose in the morning with one or two inhaled puffs when pain spikes. Never stack a second oral dose on top of the first before the first has peaked, because the effects multiply and panic or heavy sedation can follow.

cannabis dosage for severe pain

CBD and THC ratios

Severe pain often responds to a 1:1 ratio of THC to CBD. CBD can soften the anxiety and rapid heart rate that high THC brings, and some trials use 200 to 600 mg of CBD by mouth for nerve pain. If you try a 1:1 edible, count only the THC milligrams when you titrate. CBD does not blunt impairment from THC.

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Signs to stop and call a clinician

• Chest pain, fainting, or a pulse above 120 at rest.
• Repeated vomiting or stomach pain that eases with hot showers.
• Confusion, hallucinations, or a panic attack that will not settle.
• Pain that worsens after each dose instead of easing.

Tolerance builds within a few weeks of daily use. If your relief dose keeps climbing, take two days off, switch to a 1:1 product, or add a non-cannabis treatment your clinician suggests.