View the Comparison Table: Some Oral Antiseizure Medications

When used for the appropriate seizure type, antiseizure medications (ASMs) are roughly equivalent in efficacy. In addition to the seizure type, the choice of drug is usually based on factors such as ease of use, spectrum of activity, adverse effects, interactions with other drugs, presence of comorbid conditions, suitability for elderly persons and those with childbearing potential, and cost. Treatment should begin with a single drug, increasing the dosage gradually until seizures are controlled or adverse effects become unacceptable. If seizures persist, expert clinicians generally try at least one and sometimes a second alternative drug as monotherapy before considering use of two drugs at the same time.

The FDA has approved fenfluramine oral solution (Fintepla – Zogenix) for treatment of seizures in patients ≥2 years old with Dravet syndrome. It is the third drug to be approved for this indication. Stiripentol (Diacomit) and cannabidiol (Epidiolex), a purified product derived from marijuana, were approved earlier.

The FDA now requires boxed warnings in the package inserts of benzodiazepines describing the potential for these drugs to be abused and misused and to cause addiction and physical dependence. Benzodiazepine labels have contained a boxed warning about a risk of serious drug interactions with opioids since 2016.

Cannabis (marijuana) contains more than 60 pharmacologically active cannabinoids; delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD) are the best known. THC is the main psychoactive constituent of cannabis. CBD, unlike THC, does not produce intoxication or euphoria.

The FDA has approved cannabidiol oral solution (Epidiolex – Greenwich Biosciences) for treatment of seizures associated with Dravet syndrome or Lennox-Gastaut syndrome in patients ≥2 years old. Cannabidiol (CBD) is a cannabinoid constituent of the marijuana plant (Cannabis sativa). It is the first natural marijuana product to be approved by the FDA for any indication and the first drug to be approved in the US for treatment of Dravet syndrome. Stiripentol (Diacomit), which is not a marijuana product, was also recently approved by the FDA for treatment of Dravet syndrome in combination with clobazam (Onfi) and will be reviewed in a future issue.

Treatment of epilepsy should begin with a single antiepileptic drug (AED), increasing its dosage gradually until seizures are controlled or adverse effects become intolerable. If seizures persist, specialists generally recommend trying at least one and sometimes a second alternative drug as monotherapy before considering use of two drugs concurrently. When used for the appropriate seizure type, AEDs are roughly equivalent in efficacy. Drug choice is usually based on factors such as ease of use, adverse effects, drug interactions, presence of comorbidities, and cost.

View the Comparison Table: Some Oral Antiepileptic Drugs

Treatment of epilepsy should begin with a single drug, increasing the dosage gradually until seizures are controlled or adverse effects become unacceptable. If seizures persist, expert clinicians generally prescribe at least one and sometimes a second alternative drug as monotherapy before considering use of two drugs at the same time. When used for the appropriate seizure type, antiepileptic drugs are roughly equivalent in efficacy. The choice of drug is usually based on factors such as ease of use, adverse effects, interactions with other drugs, presence of comorbid conditions and cost.

Clobazam (Onfi – Lundbeck), an oral benzodiazepine, has been approved by the FDA for adjunctive treatment of seizures associated with Lennox-Gastaut syndrome (LGS) in patients ≥2 years old. It has been available in Canada (Frisium) and other countries for years for treatment of anxiety and many types of epilepsy.