Prescription Drug Coverage

Phenobarbital (Luminal) Medicare Coverage

You may be able to find Medicare plan options in your area that cover Phenobarbital (generic Luminal). Learn more about Phenobarbital and find Medicare Advantage plans in your area that cover other prescription drugs.
Chemical name: Phenobarbital

Brand name: Luminal

Typical dosage: 15mg

Typical type: Tablet1

Phenadoz is a medication used to treat allergies, nausea and vomiting. Phenadoz is available as a brand name or a generic and comes as a rectal suppository.

Phenobarbital is used as a sedative and to treat generalized, tonic-clonic, status epilepticus and partial seizures. It is a barbiturate that has sedative and anticonvulsant properties.

Phenobarbital is typically taken once or multiple times daily. The brand name equivalent of Phenobarbital is called Luminal.

Common side effects of Phenobarbital include drowsiness, headache and upset stomach.

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Does Medicare cover Phenobarbital or Luminal?

Some Medicare Advantage plans and Medicare Part D plans in your area may cover Phenobarbital.

  • 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.1

  • 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 Phenobarbital.

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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 Phenobarbital with Medicare drug coverage

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

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 $480 in 2022.
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.

Additional information

You may build a tolerance to the effects of Phenobarbital over time if you have been taking it for a long time or if you have taken high doses. This can make the drug not work as effectively.

Do not increase your dose without talking to your doctor. Do not stop taking Phenobarbital suddenly or without talking to your doctor.

Make sure you know how the sedative side effects of Phenobarbital impact you before driving or doing other activities that require your full attention. It is recommended to avoid alcohol while taking Phenobarbital.

Birth control effectiveness can be impacted by Phenobarbital. Use a second type of contraception while using this medication.

Phenobarbital is a C-IV controlled substance due to its low potential for abuse and misuse.



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.