Cannabis for PTSD Dosage: THC, CBD, and Safe Use Guide

Answer first

There is no standard cannabis dose for PTSD. No federal health agency publishes a fixed milligram target for THC or CBD in PTSD care. Clinicians who talk with patients about cannabis focus on a start-low, go-slow plan, product potency, and close tracking of symptoms. Cannabis is not an approved treatment for PTSD, and it can worsen some symptoms.

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Why a single dose does not exist

Dose depends on factors that differ from person to person. These include the ratio of THC to CBD, the product form (flower, oil, edible, tincture), your tolerance, your body weight, your metabolism, other medicines you take, and the PTSD symptoms you hope to address. A dose that helps one person sleep may cause panic in another. State law also changes what products you can buy and how they are tested.

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PTSD symptoms fall into clusters: re-experiencing, avoidance, negative mood, and hyperarousal. Cannabis may affect each cluster in a different way. Research on cannabis for PTSD is limited, and most studies are small or have mixed results.

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What major health agencies say

The National Center for PTSD states that evidence is not strong enough to recommend cannabis as a PTSD treatment. The U.S. Department of Veterans Affairs does not recommend marijuana or other cannabis products for PTSD. The National Institute on Drug Abuse notes that cannabis can cause or worsen anxiety, paranoia, and memory problems in some people. The Centers for Disease Control and Prevention advises that there is no standard dose of cannabis and that effects vary by person and product.

How clinicians approach THC and CBD

Many clinicians suggest a CBD-dominant product first because CBD has a lower risk of anxiety and impairment. If THC is used, the goal is the smallest amount that helps with a specific symptom, such as sleep or nightmares. Products with a known lab report give you a clear THC and CBD percentage. Without a lab report, you cannot know what you are taking.

Steps to find a dose with medical guidance

1. Speak with your prescriber or a clinician who knows cannabis and PTSD before you start.
2. Review your state law and check whether products require lab testing.
3. Pick one product with a listed THC and CBD content and a current lab report.
4. Begin with a low THC amount, such as 1 to 2.5 mg, or a CBD-only product.
5. Wait two hours before another dose if you inhale, and wait up to four hours if you eat an edible.
6. Write down the product, dose, time, and symptom response in a notebook or phone note.
7. Increase by a small amount no more than every few days.
8. Stop use and contact a doctor if you feel severe anxiety, paranoia, chest pain, or a racing heart.

Safety notes

• Cannabis can interact with antidepressants, anti-anxiety drugs, blood thinners, and other medicines.
• High-THC products may increase anxiety and paranoia.
• Do not drive or operate machines after using THC.
• Keep cannabis away from children and pets.
• Pregnant or breastfeeding people should not use cannabis.

Track and adjust

Keep a log for at least two weeks. Note sleep hours, nightmare frequency, anxiety level, and any side effects. Bring the log to your clinician. If cannabis does not help, or if it makes symptoms worse, stop and ask about other options such as therapy, SSRIs, or prazosin for nightmares.