Primidone: Price, Dosage & Where to Buy

Primidone is an anticonvulsant medicine used to help control certain epileptic seizures. It is most commonly prescribed for grand mal, psychomotor, and focal seizures, either on its own or alongside other anticonvulsants. Primidone is available as a generic medicine and requires a prescription in the United Kingdom.

Primidone is used to control several types of epileptic seizure. These include grand mal seizures, which involve widespread seizure activity, psychomotor seizures, and focal seizures, which begin in one area of the brain. It may also help control grand mal seizures that have not responded adequately to other anticonvulsant treatment.

The label states that primidone may be used alone or together with other anticonvulsants. Treatment is intended to reduce seizure activity and maintain control over time. A prescriber decides whether primidone is suitable based on the seizure pattern, previous treatment, and the person’s overall circumstances.

Primidone is an anticonvulsant medicine. Medicines in this group reduce excessive or uncontrolled electrical activity in the brain, helping nerve cells communicate in a more stable way. This lowers the likelihood that abnormal electrical activity will spread and develop into a seizure.

Primidone also produces active anticonvulsant compounds in the body, which contribute to its effect. The overall aim is improved control of seizure activity rather than immediate relief of a symptom. The effect of a dosage regimen may take several weeks to assess, so treatment is normally reviewed over time by a prescriber.

The label lists 50 mg, 125 mg, and 250 mg tablets. The usual starting dose is 100 to 125 mg at bedtime for patients aged 8 years and older who have not received previous treatment. The usual starting dose is 50 mg at bedtime for children under 8 years of age.

The label lists gradual increases during the initial treatment period, followed by divided maintenance doses. The usual maintenance dosage is 250 mg three times a day or four times a day for most adults and children aged 8 years and over. The label lists 125 mg three times daily to 250 mg three times daily for children under 8 years of age.

The label lists 10 to 25 mg/kg/day in divided doses for children under 8 years of age. Dosage is individualised, and blood level testing may sometimes be needed for adjustment.

A missed dose can reduce the level of anticonvulsant protection and may increase the risk of seizure activity. Standard pharmacy advice is to take the missed dose when remembered unless it is nearly time for the next scheduled dose. A double dose should not be used to make up for a missed dose.

Primidone should not be stopped suddenly, because abrupt withdrawal of antiepileptic medication may precipitate status epilepticus. A pharmacist or prescriber can advise if several doses have been missed.

The effects of primidone in human pregnancy and nursing infants are unknown. Reports suggest a possible association between anticonvulsant use and birth defects, although the evidence cannot establish a definite cause-and-effect relationship.

The label states that primidone should not be discontinued suddenly when it is being used to prevent major seizures, because this may precipitate status epilepticus. Pregnant women receiving anticonvulsant therapy should discuss treatment with the prescribing doctor, including vitamin K1 therapy and pregnancy registry information.

Store primidone at 20° to 25°C. Keep the tablets in a tight, light-resistant container with a child-resistant closure to maintain quality. Keep the medicine away from children and moisture, and follow the storage instructions on the label.