Primidone Brand Name– Mysoline
What is Primidone
Primidone is an anticonvulsant drug that is structurally related to phenobarbital.
Primidone is metabolized to phenobarbital and therefore shares its anticonvulsant and sedative properties.
Primidone may be more effective than therapy with phenobarbital alone because primidone and both of its metabolites, phenobarbital and phenylethylmalonamide (PEMA), possess anticonvulsant activity.
Primidone is effective in all types of seizure disorders except absence seizures.
Primidone may be used alone, in sub-hypnotic doses, or in combination with other anticonvulsants.
Primidone was introduced as an anticonvulsant in 1952, and the FDA approved it in 1954. In June 2008, the FDA approved the use of an alternate manufacturer of the Mysoline® brand 250 mg tablet.
The new tablet differs in appearance from the previously approved tablet; therefore, Valeant Pharmaceuticals will be distributing a notification letter to healthcare professionals as well as patient advocacy groups and other relevant organizations.
Indications
- partial seizures
- tonic-clonic seizures
- tremor
Side Effects
- agitation
- agranulocytosis
- anemia
- anorexia
- asthenia
- ataxia
- bullous rash
- coma
- confusion
- depression
- diplopia
- dizziness
- drowsiness
- ecchymosis
- elevated hepatic enzymes
- emotional lability
- exfoliative dermatitis
- fatigue
- folate deficiency
- hepatitis
- hypoprothrombinemia
- impaired cognition
- impotence (erectile dysfunction)
- insomnia
- irritability
- jaundice
- lethargy
- libido decrease
- lupus-like symptoms
- maculopapular rash
- megaloblastic anemia
- miosis
- mydriasis
- nausea
- neonatal abstinence syndrome
- neutropenia
- nightmares
- nystagmus
- osteomalacia
- osteopenia
- photosensitivity
- physiological dependence
- porphyria
- psychological dependence
- ptosis
- purpura
- respiratory depression
- seizures
- serum sickness
- Stevens-Johnson syndrome
- suicidal ideation
- teratogenesis
- thrombocytopenia
- tolerance
- toxic epidermal necrolysis
- urticaria
- vertigo
- vitamin D deficiency
- vomiting
- weakness
- withdrawal
Monitoring Parameters
- CBC
- LFTs
Contraindications
- abrupt discontinuation
- agranulocytosis
- alcoholism
- anticoagulant therapy
- anuria
- barbiturate hypersensitivity
- breast-feeding
- carbamazepine hypersensitivity
- chronic obstructive pulmonary disease (COPD)
- CNS depression
- coadministration with other CNS depressants
- depression
- dialysis
- driving or operating machinery
- ethanol ingestion
- exfoliative dermatitis
- geriatric
- hepatic disease
- hepatic encephalopathy
- hydantoin hypersensitivity
- labor
- neonates
- obstetric delivery
- osteomalacia
- osteoporosis
- porphyria
- pregnancy
- premature neonates
- pulmonary disease
- renal failure
- renal impairment
- respiratory depression
- seizure disorder
- seizures
- sleep apnea
- status epilepticus
- suicidal ideation
Interactions
- Abacavir; Dolutegravir; Lamivudine
- Abemaciclib
- Abiraterone
- Acalabrutinib
- Acetaminophen
- Acetaminophen; Aspirin, ASA; Caffeine
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- Acetaminophen; Butalbital; Caffeine
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- Acetaminophen; Caffeine
- Acetaminophen; Caffeine; Dihydrocodeine
- Acetaminophen; Caffeine; Magnesium Salicylate; Phenyltoloxamine
- Acetaminophen; Caffeine; Phenyltoloxamine; Salicylamide
- Acetaminophen; Chlorpheniramine; Dextromethorphan; Phenylephrine
- Acetaminophen; Chlorpheniramine; Dextromethorphan; Pseudoephedrine
- Acetaminophen; Chlorpheniramine; Phenylephrine; Phenyltoloxamine
- Acetaminophen; Codeine
- Acetaminophen; Dextromethorphan
- Acetaminophen; Dextromethorphan; Doxylamine
- Acetaminophen; Dextromethorphan; Guaifenesin; Phenylephrine
- Acetaminophen; Dextromethorphan; Phenylephrine
- Acetaminophen; Dextromethorphan; Pseudoephedrine
- Acetaminophen; Dichloralphenazone; Isometheptene
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- Acetaminophen; Guaifenesin; Phenylephrine
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