Medical Cannabis for PTSD vs Antidepressants: Which First?
Antidepressants have the strongest evidence for PTSD. Medical cannabis can help some people who fail SSRIs. Here's how I'd choose.
There is no standard medical cannabis dose for PTSD. Most clinicians recommend starting with 1 to 2.5 mg of THC per dose, or a CBD-dominant product, and increasing slowly over days or weeks. Response varies with genetics, tolerance, method of use, and symptom severity.
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Is there a standard medical cannabis dose for PTSD?
No. PTSD symptoms and cannabis responses differ from person to person. No cannabis product has FDA approval for PTSD, so dosing relies on clinical judgment and patient-reported outcomes rather than a fixed prescription.
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How do you start medical cannabis for PTSD?
Start with the lowest possible dose that produces a mild effect. Take it at a time when you can observe how you feel for several hours. Keep a written log of dose, time, symptom scores, and side effects.
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What is the start low, go slow rule?
Begin with 1 to 2.5 mg THC. Wait at least 2 hours for oral products or 15 minutes for inhaled products before taking more. Increase by the same small amount every 2 to 3 days only if you tolerate the current dose.
THC vs CBD for PTSD: what ratio should you try?
Some people find THC-dominant products helpful for nightmares and sleep. Others prefer CBD-dominant products to avoid intoxication and anxiety. Common starting ratios range from 1:1 THC to CBD up to 1:20, but there is no clear evidence that one ratio works best.
How does the method of use change medical cannabis dosage?
Inhalation delivers THC within minutes and wears off in 2 to 4 hours, which makes it easier to titrate. Oral products like edibles take 30 to 120 minutes to peak and can last 6 to 8 hours, so they carry a higher risk of overdose if you redose too soon.
- Inhalation: 1 to 2.5 mg THC per puff or dose, effects within 15 minutes.
- Oral: 1 to 2.5 mg THC, wait 2 hours before more.
- Sublingual tinctures: 1 to 5 mg THC, onset 15 to 45 minutes.
What dose ranges are reported in research on cannabis for PTSD?
Observational studies report a wide range, often 1 to 5 mg THC per dose and up to 30 mg per day. A systematic review found insufficient evidence to recommend a specific dose. Most studies are small and lack control groups.
What side effects and risks should you watch for?
- Anxiety, paranoia, rapid heart rate, impaired coordination, memory problems, dry mouth, and dizziness.
- Cannabis use disorder, withdrawal, and worsening PTSD symptoms can occur with heavy or daily use.
- THC can interact with antidepressants, benzodiazepines, and blood thinners.
How do you track and adjust your medical cannabis dose?
- Record the product name, THC and CBD content, dose, time, and symptoms before and after.
- Rate nightmares, hyperarousal, and avoidance on a 0 to 10 scale.
- Adjust only one variable at a time and review your log with a clinician every 2 to 4 weeks.
When should you talk to a clinician about medical cannabis for PTSD?
Talk to a clinician before starting cannabis, especially if you take other medications or have a history of psychosis or substance use disorder. A clinician can help you set a dose range, monitor side effects, and combine cannabis with evidence-based PTSD therapies like trauma-focused CBT or EMDR.