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As the FDA have only approved the use of CBD for specific forms of epilepsy, doctors know little about what dosage people should take when they use it for other reasons. As with any drug, the appropriate dosage is one that provides a therapeutic effect and is well-tolerated.
In clinical studies, researchers have used various oral dosages of CBD, ranging from 100–800 mg per day.
Some studies use even higher dosages. According to a review, an individual reported an improvement in psychosis after taking 1,200 mg per day for a few weeks. In another study, people with schizophrenia reported benefits after taking increasing dosages of 40–1,280 mg per day for 4 weeks.
In a study into the effects of CBD in people with Parkinson’s disease and psychosis, six participants showed significant improvement in symptoms with a dosage of 150 mg per day of CBD.
The following table lists the method of administration and dosage of CBD that researchers have used to study its therapeutic effects on different medical conditions.
Medical condition |
Dose of CBD |
Form |
anxiety |
300–600 mg |
oral |
bowel disease |
5 mg twice daily |
sublingual (olive oil drops) |
type 2 diabetes |
100 mg twice daily |
oral |
pain due to cancer |
50–600 mg per day |
oral |
Parkinson’s disease |
75–300 mg per day |
oral |
Huntington’s disease |
Up to 12 sprays per day |
Sativex nasal spray (contains CBD and THC in 1:1 concentration) |
To find out whether a CBD product is safe and to determine the effective dosage, people should consult a doctor. *