primidone, Mysoline

  • Pharmacy Author:
    Omudhome Ogbru, PharmD

    Dr. Ogbru received his Doctorate in Pharmacy from the University of the Pacific School of Pharmacy in 1995. He completed a Pharmacy Practice Residency at the University of Arizona/University Medical Center in 1996. He was a Professor of Pharmacy Practice and a Regional Clerkship Coordinator for the University of the Pacific School of Pharmacy from 1996-99.

  • Medical Editor: Jay W. Marks, MD
    Jay W. Marks, MD

    Jay W. Marks, MD

    Jay W. Marks, MD, is a board-certified internist and gastroenterologist. He graduated from Yale University School of Medicine and trained in internal medicine and gastroenterology at UCLA/Cedars-Sinai Medical Center in Los Angeles.

What is primidone-oral, and how does it work (mechanism of action)?

Primidone is an oral anticonvulsant (anti-seizure) medication used for treating several types of seizures. Its exact mechanism of action is not known. Primidone is converted into phenobarbital and phenylethylmalonamide (PEMA) in the body. Primidone, phenobarbital, and PEMA all have anticonvulsant activity. In addition to its anticonvulsant activity, PEMA increases the anticonvulsant activity of phenobarbital. The FDA approved primidone in March, 1954.

What brand names are available for primidone-oral?

Mysoline

Is primidone-oral available as a generic drug?

GENERIC AVAILABLE: Yes

Do I need a prescription for primidone-oral?

Yes

What are the uses for primidone-oral?

Primidone is used alone or with other medications for treating grand mal, psychomotor, or focal epileptic seizures. It may be effective for grand mal seizures that are not responsive to other anticonvulsants. Primidone should not be used by patients with porphyria and people who are allergic to phenobarbital.

What are the side effects of primidone-oral?

Common side effects of primidone include:

  • Difficulty speaking (dysarthria)
  • Burning, tingling from damaged nerves (paresthesia)
  • Difficulty moving (ataxia)
  • Loss of balance (vertigo)
  • Paradoxical excitement (children)
  • Hyperactivity (children)
  • Excitement
  • Confusion
  • Depression
  • Drowsiness
  • Irritability
  • Headache
  • Restlessness
  • Nystagmus
  • Dizziness

Possible serious side effects of primidone include:

  • Acute psychosis
  • Nausea
  • Vomiting
  • Constipation
  • Diarrhea
  • Folate-deficiency anemia
  • Liver toxicity
  • Low blood calcium
  • Rickets
  • Weakening of bones
  • Rash
  • Serious skin reactions (for example, Stevens-Johnson syndrome)

Seizure medications increase the risk of suicidal thoughts or behavior. Patients treated with seizure medications should be observed for the emergence or worsening of depression, suicidal thoughts or behavior, and unusual changes in mood or behavior.

Suddenly stopping medications for seizures may cause seizures.

Medically Reviewed by a Doctor on 1/21/2016

Quick GuideEpilepsy: Symptoms, Causes and Treatment

Epilepsy: Symptoms, Causes and Treatment
FDA Logo

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

RxList Logo

Need help identifying pills and medications?

Use the pill identifier tool on RxList.

Subscribe to MedicineNet's Newsletters

Get the latest health and medical information delivered direct to your inbox!

By clicking Submit, I agree to the MedicineNet's Terms & Conditions & Privacy Policy and understand that I may opt out of MedicineNet's subscriptions at any time.

Health Solutions From Our Sponsors