What to watch for

When first starting PRIMAXA ODT, it’s important to know the body may adjust as it gets used to treatment. It’s common to experience mild side effects at first. The most frequent side effects are trouble with coordination or balance and dizziness. These effects are usually temporary and fade over time as the body adjusts to PRIMAXA ODT.

Other serious side effects may include:

Severe sleepiness, especially when first taking PRIMAXA ODT or trouble staying awake

Blood problems, which are rare, include symptoms of:
- fever, swollen glands, or sore throat that does not go away
- tiredness
- shortness of breath

Allergic reactions, which are rare, include symptoms of:
- skin rash
- hives
- mouth sores
- blistering or peeling skin

If you see or suspect any of these side effects, contact your prescribing doctor immediately.

For Caregivers

Always keep a list of your and your child’s medications with you. If you need to contact your doctor about potential side effects or medication adjustments, they will need this information.

What you can do

Pay attention to how your child is feeling physically and emotionally

Tell your child’s doctor right away if something feels off especially in their mood or behavior

Write it down: Even small changes or side effects are worth noting

Don’t Wait: If something feels serious, seek medical help immediately

Did you know?

The specialty pharmacy that supplies PRIMAXA ODT can answer questions about this medication. For more information

INDICATION AND IMPORTANT SAFETY INFORMATION View Full

WARNING: RISK OF SUICIDAL THOUGHTS AND BEHAVIORS; ABRUPT WITHDRAWAL; CNS DEPRESSION; HEMATOLOGIC ABNORMALITIES; USE IN PREGNANCY AND LACTATION; PHENYLKETONURIA; AND MAXIMUM DOSAGE LIMITATIONS

Suicidal Thoughts and Behaviors

Antiepileptic drugs (AEDs), including PrimaxaTM ODT (primidone orally disintegrating tablets), may increase the risk of suicidal thoughts or behavior. This risk is class-wide and applies to all AEDs, regardless of indication. Monitor all patients for new or worsening depression, suicidal ideation, or unusual changes in mood or behavior. Inform patients, caregivers, and families to be alert for these symptoms and to report them immediately.

Abrupt Withdrawal

Abrupt discontinuation of Primaxa ODT may result in increased seizure frequency or status epilepticus. Withdrawal should be done gradually under close medical supervision to minimize risk.

Central Nervous System Depression

Primaxa ODT can cause dose-dependent CNS depression. The most frequently reported side effects include sedation, dizziness, ataxia, vertigo, nausea, and visual disturbances. Caution patients against performing activities requiring mental alertness, such as driving or operating machinery, until they understand how the medication affects them.

Hematologic Abnormalities

Serious blood disorders have been reported with Primaxa ODT, including agranulocytosis, aplastic anemia, and red cell aplasia. Periodic complete blood counts are recommended during prolonged therapy. Megaloblastic anemia may also occur as a rare idiosyncratic reaction and typically responds to folic acid supplementation without discontinuing therapy.

Use in Pregnancy

The effects of primidone in human pregnancy are not well established. Use during pregnancy only if the potential benefit justifies the potential risk to the fetus. AEDs have been associated with an increased incidence of birth defects. Neonatal bleeding resembling vitamin K deficiency has been reported; consider vitamin K1 supplementation during the last month of pregnancy.

Use in Lactation

Primidone and its metabolites are excreted into breast milk in substantial quantities. Monitor nursing infants for signs of sedation or feeding difficulties. Discontinue breastfeeding if adverse effects are observed.

Phenylketonuria Warning

Primaxa ODT contains aspartame, a source of phenylalanine. Use with caution in patients with phenylketonuria.

Maximum Dosage Limitation

The total daily dose of Primaxa ODT should not exceed 2 grams. Therapeutic effects may take several weeks to be fully realized. Patients on long-term treatment should undergo periodic monitoring, including bloodwork and metabolic panels (e.g., SMA-12) every 6 months.

Adverse Reactions

The most common side effects include nausea, anorexia, vomiting, fatigue, hyperirritability, emotional disturbances, sexual dysfunction, diplopia, nystagmus, drowsiness, and morbilliform skin eruptions. Early side effects such as ataxia and vertigo tend to resolve with continued therapy or dose reduction. Rare but serious events include dermatologic reactions and hematologic abnormalities. Most adverse events are dose-related and may subside with dosage adjustment or continued use.

Please see full Prescribing Information for additional safety and dosing information.