Answer: There is no single pediatric medical cannabis dose by weight that applies to all children. Only Epidiolex (cannabidiol), an FDA-approved prescription medicine, uses weight-based mg/kg dosing for specific epilepsy syndromes. All other cannabis products lack pediatric dosing standards, so a qualified clinician must set and adjust any dose.
medical cannabis for children with seizures
Is there a standard pediatric medical cannabis dose per kilogram?
No. Medical cannabis is not one drug, and whole-plant products vary widely in THC, CBD, and other compounds. That variation makes a universal mg/kg chart impossible. The FDA has approved only one cannabis-derived medication, and its label is limited to certain seizure disorders in patients 1 year and older.
How does weight-based dosing work for the FDA-approved option?
Epidiolex is dosed in milligrams per kilogram per day (mg/kg/day), divided into two doses. The label for Lennox-Gastaut syndrome and Dravet syndrome starts at 2.5 mg/kg twice daily and titrates upward under medical supervision. Tuberous sclerosis complex uses a different starting schedule. A prescriber calculates each dose from the child's current weight and the product concentration.
Why isn't there a universal mg/kg chart for THC or CBD oils?
Most state-legal cannabis oils are not FDA-approved and have not been tested in children. Potency labels can be inaccurate, and THC can impair brain development. Federal research limits mean pediatric trials for these products are scarce. Without that data, no safe or effective mg/kg range can be established.
What do clinicians consider when setting a pediatric dose?
- Body weight in kilograms and changes over time
- Diagnosis and seizure or symptom frequency
- Product concentration and ratio of CBD to THC
- Other medications, especially clobazam and valproate
- Liver and kidney function
Doses usually start low and increase slowly, a process called titration. Clinicians watch for side effects such as sleepiness, appetite loss, diarrhea, or liver enzyme changes. Blood tests may be needed after dose changes.
What are the main safety concerns for children?
CBD can interact with prescription drugs and, in rare cases, cause liver injury. THC is linked to problems with memory, attention, and mood in developing brains. The American Academy of Pediatrics advises against non-medical cannabis use in children and teens. Pediatric use should stay within FDA-approved indications or formal research.
What should parents do next?
Talk with a board-certified pediatric specialist, such as a neurologist or oncologist, who is familiar with cannabis-based medicines. Ask whether an FDA-approved product fits the diagnosis before considering other options. Never calculate a child's dose from an adult product or a friend's experience.
Can you scale an adult cannabis dose down by weight for a child?
No. Children process drugs differently, and adult products may contain THC at levels that are unsafe for a developing brain. Weight scaling alone ignores metabolism, interactions, and diagnosis-specific evidence.
Does a higher weight always mean a higher dose?
Not necessarily. Weight is one factor, but clinicians also adjust for response, side effects, and drug levels. Some children reach an effective dose at a lower mg/kg than others.