What Is Epidiolex? Uses, Dosage, and What You Need to Know in 2026

You may have heard of Epidiolex as the first FDA-approved cannabis-derived medication. But what exactly is it, who is it for, and how is it different from the CBD products you see in stores? This guide covers everything patients, caregivers, and curious readers need to know about Epidiolex in 2026.

What Is Epidiolex?

Epidiolex is a prescription medication containing cannabidiol (CBD) as its active ingredient. It is manufactured by Jazz Pharmaceuticals (formerly GW Pharmaceuticals) and was FDA-approved on June 25, 2018 — making it the first plant-derived, FDA-approved pharmaceutical-grade CBD medication in the United States.

Epidiolex comes as a 100 mg/mL oral solution (liquid) with a strawberry flavor. It is supplied in 105 mL amber glass bottles and includes calibrated dosing syringes. The medication is greenhouse-grown from non-GMO cannabis plants, and the CBD is highly purified — it contains no THC, so it will not cause a "high."

What Is Epidiolex Approved to Treat?

Epidiolex is FDA-approved to treat seizures associated with three rare and severe forms of epilepsy in patients 1 year of age and older:

1. Lennox-Gastaut Syndrome (LGS)

LGS is a severe childhood-onset epilepsy characterized by multiple seizure types, cognitive impairment, and characteristic EEG patterns. It typically begins before age 8. In clinical trials, Epidiolex reduced drop seizures (atonic and tonic seizures, which cause sudden falls) by approximately 44% compared to 22% with placebo over 14 weeks.

2. Dravet Syndrome

Dravet syndrome is a rare, severe epilepsy that begins in the first year of life. It is often caused by mutations in the SCN1A gene and is characterized by prolonged febrile seizures and treatment resistance. In a 14-week clinical trial, children and teenagers with Dravet syndrome who took Epidiolex had significantly fewer convulsive seizures than those taking placebo. More than 55,000 families have started on Epidiolex since its approval.

3. Tuberous Sclerosis Complex (TSC)

TSC is a genetic disorder that causes benign tumors to grow in the brain and other organs. Seizures typically begin in early childhood and are often difficult to control. Epidiolex's indication for TSC was approved later than the LGS/Dravet indication, based on a 16-week clinical trial showing significant reduction in TSC-associated seizures versus placebo.

Is Epidiolex the Same as CBD Oil from the Store?

No. Epidiolex and over-the-counter CBD products are fundamentally different. Epidiolex is:

FDA-approved through rigorous clinical trials proving safety and efficacy

Nearly 100% pure CBD with guaranteed, consistent concentration bottle-to-bottle

Manufactured to FDA's Good Manufacturing Practices (cGMP) standards

Requires a prescription from a licensed healthcare provider

OTC CBD products are not FDA-approved, not regulated for purity or potency, and have not been proven effective for treating seizures. Research published in JAMA found wildly inaccurate labeling in many OTC CBD products. Never substitute OTC CBD for Epidiolex without medical guidance.

Is Epidiolex a Controlled Substance?

No. Epidiolex was originally placed in DEA Schedule V when it was approved in 2018. However, in April 2020, the DEA descheduled Epidiolex entirely — removing it from the Controlled Substances Act. Epidiolex is now a non-controlled prescription medication. Prescriptions are valid for one year and can be transferred between pharmacies — though the specialty pharmacy requirement still applies.

How Is Epidiolex Dosed?

Epidiolex dosing is weight-based, which means the right dose for your child or for you depends on body weight. For LGS and Dravet syndrome:

Starting dose: 2.5 mg/kg twice daily (5 mg/kg/day)

Maintenance dose: Increased after one week to 5 mg/kg twice daily (10 mg/kg/day)

Maximum dose: 10 mg/kg twice daily (20 mg/kg/day) for patients who need more seizure control and can tolerate higher doses

The dose is taken twice daily by mouth using the calibrated syringes provided with each bottle. It can be taken with or without food, but should be taken consistently the same way each day, since food can affect absorption. Doses should not be changed without consulting your neurologist.

How to Get Epidiolex

Epidiolex is only available through specialty pharmacies — not regular retail pharmacies. Your neurologist or epileptologist prescribes it and routes the prescription to a specialty pharmacy. Insurance prior authorization is typically required, which can take 2-4 weeks. The JazzCares program (1-833-426-4243) provides insurance support and can bridge initial delays with free medication through the Quick Start Program.

If you need help locating a pharmacy that can fill your Epidiolex prescription, use medfinder to search near you. For a deeper explanation of how Epidiolex works in the brain, read our article on Epidiolex's mechanism of action.