Zarontin (Ethosuximide) Medicare Coverage

Chemical name: Ethosuximide

Brand name: Zarontin

Typical dosage: 250mg

Typical type: Capsule1

Zarontin is a medication used to treat absence seizures. Zarontin is available in its generic form as Ethosuximide and comes as an oral capsule or oral liquid.

Zarontin is a medication that contains the active ingredient Ethosuximide.

Zarontin is a medication used to treat absence, or petit mal, seizures. It is typically taken one or multiple times daily. Zarontin is an anticonvulsant that raises the threshold your body needs to reach in order to trigger a seizure.

Some side effects of Zarontin include sleepiness, headache, dizziness, hiccups, upset stomach, diarrhea, weight loss and loss of appetite.

Does Medicare cover Zarontin or Ethosuximide?

Yes! 100% of Medicare Advantage plans and Medicare Part D plans cover Ethosuximide, the generic form of Zarontin.1

  • Medicare Advantage plans that offer prescription drug coverage are called Medicare Advantage Prescription Drug Plans (MA-PD). Most Medicare Advantage beneficiaries (88 percent) are enrolled in MA-PDs.2

  • Medicare prescription drugs plans each have their own formulary, or drug list, that details what prescription drugs are covered by the plan and how they are covered.

Drug coverage may vary based on plan availability. You may be able to find Medicare Advantage plan options in your area that cover Ethosuximide.

Find Medicare Advantage plans with drug coverage

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Or call TTY Users: 711 24/7 to speak with a licensed insurance agent.


You can also compare Part D prescription drug plans available where you live and enroll in a Medicare prescription drug plan online when you visit

Average costs for Ethosuximide (generic Zarontin) with Medicare drug coverage1

Your copay and deductible costs for any prescription drug can vary depending on what coverage stage you’re in.

Deductible stage Typical copay stage
Your deductible is the amount of money you must spend on covered drugs before your Medicare drug coverage starts paying its share of costs.

In the deductible stage, you’re responsible for the full cost of your prescription drugs.

Some Medicare prescription drug plans have a $0 deductible. Medicare drug plans cannot have a deductible more than $415 in 2019.
After you meet your Part D deductible, you enter the initial coverage period.

During this phase (the typical copay stage), you pay a copayment (flat fee) or coinsurance (percentage) for your covered medications.
$15 – $131 $5 – $131

Additional information

Take Zarontin every day to help prevent seizures. It is important that you do not stop taking this medication suddenly without talking to your doctor, as you can have a higher risk of seizures.

Zarontin may increase your risk for thoughts of suicide. Talk to your doctor if you experience panic attacks or changes in mood or actions while taking Zarontin.

Let your doctor know if you experience signs of infection or signs of lupus while taking Zarontin.

Signs of infection include fever, chills, sore throat, ear or sinus pain, cough, pain while urinating or a wound that won’t heal.

Signs of lupus include a rash on the cheeks or other body parts, increased frequency of sun burn, muscle or joint pain, chest pain, shortness of breath and swelling in the arms or legs.



This article is for informational purposes only. It is not healthcare advice, treatment, or diagnosis. It is not an endorsement of or recommendation for this medication. Speak to your doctor or healthcare provider about your specific healthcare needs, including your prescription medications. Only take medication as directed by your doctor.

Coverage and costs of prescription medications will vary by Medicare plan. Not all plans are available in all areas.


Written by Hayden Gharibyar, Pharm.D.