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General Medication Fact Sheet for Primidone
| Field | Information |
|---|---|
| Generic Name | Primidone |
| Brand Name Versions | Mysoline |
| Boxed/Label Warning | Antiepileptic drugs, including Primidone, increase the risk of suicidal thoughts or behavior. Monitor patients for emergence or worsening of depression, suicidal thoughts or behavior, and/or any unusual changes in mood or behavior. |
| Purpose | Anticonvulsant used to control seizures |
| Mechanism of Action | Works by decreasing abnormal electrical activity in the brain |
| Dosage Forms | Oral tablets |
| Available Strengths | 50 mg, 250 mg |
| Dosage Frequency | Typically multiple times daily, as directed by a healthcare provider |
| Common Side Effects | Drowsiness, dizziness, nausea, vomiting, ataxia (loss of coordination) |
| Serious Side Effects | Suicidal thoughts or behavior, severe allergic reactions (rash, swelling, difficulty breathing), blood disorders, liver problems |
| Drug Interactions | Other anticonvulsants (e.g., Phenytoin, Carbamazepine), CNS depressants (e.g., alcohol, benzodiazepines), warfarin |
| Important Notes | Do not stop taking Primidone suddenly without consulting your doctor; may impair thinking or motor skills; avoid alcohol |
| Storage | Store at room temperature away from moisture and light |
| Missed Dose | Take as soon as you remember; skip if it’s almost time for your next dose. Do not double the dose. |
| Alternatives | Phenobarbital, Phenytoin, Carbamazepine, Valproic Acid |
Primidone Alternatives
| Medication | Mechanism of Action | Notes |
|---|---|---|
| Phenobarbital | Increases GABAergic inhibition | A barbiturate with sedative and anticonvulsant properties. |
| Phenytoin (Dilantin) | Blocks voltage-gated sodium channels | One of the older and more established anticonvulsants. |
| Carbamazepine (Tegretol) | Blocks voltage-gated sodium channels | Effective for various types of seizures. |
| Valproic Acid (Depakote) | Increases GABA levels and blocks sodium channels | Broad-spectrum anticonvulsant. |
Primidone Side Effects
| Common Side Effects | Serious Side Effects |
|---|---|
| Drowsiness | Suicidal thoughts or behavior |
| Dizziness | Severe allergic reactions (rash, itching, swelling, difficulty breathing) |
| Nausea | Blood disorders (e.g., agranulocytosis, thrombocytopenia) |
| Vomiting | Liver problems (e.g., hepatitis, jaundice) |
| Ataxia (loss of coordination) | Cognitive impairment |
Primidone Dosage Guide
| Condition | Starting Dose | Maintenance Dose | Administration Notes |
|---|---|---|---|
| Seizures (Adults) | 125 mg daily | 750-1500 mg daily in divided doses | Increase gradually as tolerated. |
| Seizures (Children under 8) | 50 mg daily | 125-250 mg three times daily | Increase gradually as tolerated. |
| Essential Tremor | 62.5 mg at bedtime | Varies based on individual response | Titrate slowly. |
