Short answer

No established dose of cannabis exists for obsessive-compulsive disorder. No randomized clinical trial has tested THC or CBD as an OCD treatment, so no dose range has been defined. Exposure-response data for OCD do not exist. Any milligram figure published online comes from surveys, case reports, or dosing rules borrowed from other conditions.

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What the research shows

A 2022 survey of 87 adults who used cannabis for OCD symptoms reported drops in obsessions and compulsions within hours of use. The same study reported a rebound. Symptoms rose above baseline during the comedown and between sessions. The study had no placebo group and relied on self-report.

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Case reports and small trials of nabilone, a synthetic THC analog, describe fewer compulsive behaviors in a handful of patients. Sample sizes stayed under 20. That literature sets no dose.

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Amounts people report using

Surveys of medical cannabis patients show wide ranges: 1 mg to 10 mg THC per dose for inhaled flower or oil, up to 100 mg or more per day in long-term users. Tolerance, body weight, route, and product potency change the effect of the same milligram count. Inhaled THC reaches peak blood levels in minutes. Edible THC peaks at 1 to 3 hours, which makes repeat dosing hard to judge.

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THC, CBD, and ratios

THC is a partial agonist at CB1 receptors. CBD has low CB1 affinity and acts on other pathways. OCD trials with CBD alone are lacking. High-THC products raise anxiety in some users, and anxiety can trigger compulsions.

Drug interactions

Fluoxetine and paroxetine inhibit CYP2D6. CBD inhibits CYP2D6 and CYP3A4. Fluvoxamine inhibits CYP1A2 and CYP2C19. Mixing these drugs with cannabis can shift blood levels of either substance. A prescriber can adjust.

First-line OCD care

Standard treatment is an SSRI (fluoxetine, fluvoxamine, sertraline, paroxetine) plus exposure and response prevention therapy. NIMH puts OCD at about 2.3% of US adults at some point in life. No cannabis product is FDA-approved for OCD.

Legal status

Cannabis remains a Schedule I drug under US federal law. State rules differ.

Bottom line: no dose is established. Start low, log symptoms and timing, and tell your prescriber what you use.