Cannabis in Paediatric Medicine, and the Accidental Poisoning Problem

Paediatric cannabis divides cleanly into two topics that get confused with each other. One is a legitimate, narrow, prescription-supervised use with trial evidence. The other is an accidental poisoning trend that has grown alongside legalisation.

Both deserve straight treatment, and neither supports giving children THC.

The Legitimate Use: Severe Epilepsy

Epidiolex, a purified plant-derived CBD oral solution, is approved for seizures associated with Lennox-Gastaut syndrome, Dravet syndrome and tuberous sclerosis complex. These are rare, severe, childhood-onset epilepsies that often resist multiple conventional medications.

Key points for parents:

It is CBD, not cannabis, and contains no meaningful THC.

Dosing is weight based, typically starting near 5 mg per kilogram per day and titrating to around 10 to 20 mg/kg/day. For a 20 kg child that is 100 to 400 mg daily, far above retail CBD products.

Interactions require monitoring. CBD raises levels of clobazam's active metabolite, and combined with valproate is associated with raised liver enzymes. Liver enzyme testing is part of the protocol.

Adverse effects seen in trials included somnolence, decreased appetite, diarrhoea and elevated transaminases.

This is real paediatric medicine with real supervision. It is not an argument for artisanal CBD oil, which has repeatedly been found mislabelled in both directions, sometimes containing THC. For a child with a seizure disorder, inconsistent dosing between bottles undermines treatment.

Other Contexts Where Cannabinoids Appear

Chemotherapy nausea. Dronabinol and nabilone have been used in paediatric oncology when standard antiemetics are insufficient, under specialist supervision.

Paediatric palliative care. Cannabinoids are sometimes used for symptom control in children with life-limiting illness, where the balance of benefit and risk differs from routine care.

Autism and behavioural conditions. This is where demand runs furthest ahead of evidence. Some small studies of CBD-rich preparations have reported reductions in behavioural difficulties, with methodological limitations and inconsistent results. It is not established treatment, and desperation is not a reason to skip the evidence question.

Why THC Is a Different Matter in Children

The developing brain is the core issue. Neural development continues into the mid-twenties, and the endocannabinoid system participates in that process, including synaptic pruning and prefrontal maturation.

Introducing a CB1 agonist into that process carries risks that do not apply the same way in adults. Heavy adolescent cannabis use is associated with poorer verbal learning and memory, reduced educational attainment, higher rates of cannabis use disorder and increased psychosis risk, with risk scaling with earlier onset and higher potency.

Delaying first use is the single most protective factor available. That is why paediatric cannabinoid medicine is built around non-intoxicating CBD rather than THC.

The Poisoning Problem

Accidental paediatric cannabis ingestion has risen substantially in jurisdictions with legal adult markets, and the pattern is consistent enough to be predictable.

Why it happens:

Edibles look like ordinary food. Gummies, chocolate, cookies and drinks are the products involved, and a toddler cannot distinguish them.

Dose per body weight is the problem. A 10 mg edible in a 12 kg toddler is an enormous exposure relative to an adult taking the same product.

A package is often multiple doses. A child does not eat one square.

Onset is delayed, so a child can consume more before anything appears wrong.

What it looks like: lethargy and unusual sleepiness, ataxia and unsteadiness, dilated pupils, rapid heart rate, vomiting, and in more serious cases respiratory depression or seizures. Presentations severe enough for intensive care admission occur, and children have been intubated. Unlike adult overconsumption, paediatric ingestion can be genuinely dangerous.

What to do: contact emergency services or poison control immediately, and say what was eaten. Concealing it delays correct treatment and can lead to invasive investigation for other causes of altered consciousness. Nobody is served by embarrassment here.

Prevention that works: store cannabis in a locked container, keep it out of reach and out of sight rather than only out of reach, keep products in original child-resistant packaging, never decant edibles into ordinary food containers, and treat it exactly as you would prescription medication.

Bottom Line

There is one well-established paediatric cannabinoid use: purified CBD for three severe epilepsy syndromes, weight-dosed and monitored. THC is a different question because it acts on a developing brain, and delaying exposure is protective. Meanwhile the most common paediatric cannabis event in legal markets is a toddler eating an edible, which is a storage problem with a straightforward fix.

Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before making any health-related decisions.