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Generic Equivalent (Primidone)

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What is the drug primidone used for?

Primidone Medication Chemical Name: LITHIUM (LITH-ee-um)


Primidone is used to treat people with bipolar disorder (extreme mood changes from depression or anger to elation).

You can purchase the Primidone medication online from Canada Pharmacy and have it delivered right to your doorstep.


Primidone 50 mg and 250 mg tablets contain ingredients which hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, sodium lauryl sulfate, sodium starch glycolate, and talc.


Patients, 8 years of age and older who have received no previous treatment may be started on Primidone medication according to the following regimen using either 50 mg or scored 250 mg Primidone tablets:

  • Days 1 to 3: 100 to 125 mg at bedtime.
  • Days 4 to 6: 100 to 125 mg
  • Days 7 to 9: 100 to 125 mg
  • Day 10 to maintenance: 250 mg

For most adults and children 8 years of age and over, the usual maintenance dosage is three to four 250 mg Primidone tablets in divided doses (250 mg t.i.d. or q.i.d.). If required, an increase to five or six 250 mg tablets daily may be made, but daily doses should not exceed 500 mg q.i.d.


Before taking primidone do tell your doctor or pharmacist your medical history or if you are allergic to any of the ingredients. This medication is not recommended for use during pregnancy or when breastfeeding as the medication passes into breast milk and may cause side effects to the fetus. The medication causes dizziness and drowsiness, hence avoid the consumption of alcohol to worsen it. In case you are having surgery, consult your doctor first and let the doctor know of all the medications you are taking.

Side Effects:

Side effects that may occur while taking this medication include drowsiness, upset stomach, loss of appetite, stomach bloating, stomach pain, headache, and weight gain.

The most frequently occurring early side effects are ataxia and vertigo. These tend to disappear with continued therapy, or with reduction of initial dosage. Occasionally, the following have been reported:

  • Nausea
  • Anorexia
  • Vomiting
  • Fatigue
  • Hyperirritability
  • Emotional disturbances
  • Sexual impotence
  • Diplopia, nystagmus
  • Drowsiness
  • Morbilliform skin eruptions.

Rare side effects include:

  • Granulocytopenia
  • Agranulocytosis
  • Red-cell hypoplasia
  • Aplasia

Other persistent or severe side effects may necessitate withdrawal of the drug. Megaloblastic anemia may occur as a rare idiosyncrasy to Primidone.

IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

Product Code: 1608
Product Reviews

What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.

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