ZEN Retard 400 Tablet ER

ZEN Retard 400 Tablet ER is a prescription extended-release tablet that contains carbamazepine 400 mg in each tablet. It belongs to the anticonvulsant class and is used to help control certain seizure disorders. ZEN Retard 400 Tablet ER may also be prescribed for trigeminal neuralgia and other nerve-related pain when a doctor decides this strength is appropriate. Because it is an ER tablet, the medicine is released gradually over time rather than all at once.

How it works: Carbamazepine helps calm overactive nerve signals in the brain, which lowers the chance of seizures. In this extended-release tablet form, the 400 mg dose is released gradually to help keep medicine levels steadier through the day.

ZEN Retard 400 Tablet ER is a higher-strength option compared with ZEN 200 Tablet, so it is not the usual starting choice for everyone. Doctors may choose this 400 mg extended-release tablet for people who already need a stronger maintenance dose or who benefit from steadier blood levels with fewer doses per day. The exact strength and schedule depend on the condition being treated and how well the person tolerates carbamazepine.

• Partial seizures
• Generalized tonic-clonic seizures
• Trigeminal neuralgia
• Other nerve pain as prescribed by a doctor

• Swallow ZEN Retard 400 Tablet ER whole with water; do not crush, chew, or split it unless your doctor or pharmacist specifically says it is safe to do so.
• Take it at the same times each day to keep carbamazepine levels steady.
• You may take it with food if it upsets your stomach.
• Do not stop taking the tablet suddenly, because that can worsen seizures or symptoms.
• If you miss a dose, take it when you remember unless it is almost time for the next dose; do not double up.
• Follow the exact schedule on your prescription, since extended-release carbamazepine is often taken once or twice daily depending on the patient.

Each ZEN Retard 400 Tablet ER provides carbamazepine 400 mg per tablet. The number of tablets per day varies a lot; this strength is generally used for maintenance dosing, and some patients take it once daily while others need divided doses as directed by their doctor. There is no single maximum that fits everyone, so the prescriber decides the dose based on the condition, response, blood tests, and side effects.

Do not change your dose or stop the medicine without speaking to your doctor.

Common side effects of Carbamazepine may include:

• Drowsiness, which may be more noticeable with the 400 mg strength
• Dizziness
• Unsteadiness or poor coordination
• Nausea
• Vomiting
• Blurred or double vision
• Tiredness

• This is a higher-strength carbamazepine tablet, so it should be used only when a doctor has assessed that 400 mg is appropriate.
• Do not drink alcohol unless your prescriber says it is safe, because alcohol can worsen drowsiness and dizziness.
• Be careful driving or using machinery until you know how ZEN Retard 400 Tablet ER affects you.
• Tell your doctor if you have a history of liver disease, blood disorders, heart conduction problems, or glaucoma.
• Carbamazepine can lower sodium levels and may cause more dizziness or confusion in some people.
• Pregnancy and breastfeeding require medical advice before using this medicine.
• Do not use it with an MAOI and do not start or stop interacting medicines without checking first.

• MAO inhibitors
• Warfarin and other blood thinners
• Hormonal birth control pills, patches, or rings
• Macrolide antibiotics such as erythromycin or clarithromycin
• Other seizure medicines or sedatives that can add to drowsiness

Store ZEN Retard 400 Tablet ER in its original strip at room temperature, away from moisture, heat, and out of reach of children.