Dilantin 125mg/5ml Suspension

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Brand Viatris
Manufacturer Viatris
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Dr. Mohd Izzat Amir Bin Awang
Reviewed byDr. Mohd Izzat Amir Bin AwangDoctor of Medicine (MD), University of Mansoura - Manchester
Dr. Adeline Carol Peters
Written byDr. Adeline Carol PetersBachelor of Medicine and Bachelor of Surgery (MBBS) — Manipal Academy of Higher Education (MAHE)

Last updated:

Overview

Dilantin 125mg/5ml Suspension is a prescription-only medicine (POM) presented as an oral suspension, with Phenytoin 125mg/5ml as its active ingredient content.

This page is limited to product, safety and handling information, in line with Malaysian rules on prescription medicine information for the public. Your prescriber or pharmacist is the right source for anything beyond that, together with the leaflet inside the pack.

Through DoctorOnCall, this product is supplied after an online consultation with a licensed doctor and a valid prescription, and it is checked by a registered pharmacist before dispensing. Take it exactly as prescribed, and speak to your doctor before stopping, changing the dose, or starting any other medicine alongside it.

Directions for Use

Shake Dilantin 125mg/5ml Suspension well before every use to ensure the dose is evenly distributed, then measure the dose accurately with the measuring cup or oral syringe provided – do not use a regular household spoon. Take at the same time(s) each day, as consistent timing helps maintain stable blood levels of this narrow therapeutic index medicine.

Dosage

The dose of Dilantin 125mg/5ml Suspension is individualised for each patient and is often guided by blood level monitoring (therapeutic drug monitoring), as phenytoin has a narrow therapeutic index – small dose changes can have a large effect on blood levels and seizure control. Your doctor will determine your starting dose, any adjustments, and the monitoring schedule required.

Storage Instructions

Store below 30°C in a dry place, away from direct sunlight and out of reach of children.

Side Effects

  • Dizziness
  • Drowsiness
  • Nausea or vomiting
  • Constipation
  • Headache
  • Swollen or bleeding gums
  • Skin rash
  • Coordination problems
  • Confusion or slurred speech

Contraindications

  • Known hypersensitivity to phenytoin, other hydantoins, or any ingredient in this product
  • Certain heart rhythm conditions (e.g. sino-atrial block, second- or third-degree heart block) if given by injection
  • Concurrent use with delavirdine (an HIV medicine)

Drug / Food Interactions

  • Many medicines affect phenytoin blood levels or are affected by it, including warfarin, oral contraceptives, and certain other anticonvulsants – review all medicines with your doctor
  • Enteral (tube) feeds can significantly reduce phenytoin absorption if given at the same time – space apart as advised
  • Alcohol may affect phenytoin levels and can increase drowsiness
  • Folic acid, calcium, and vitamin D levels may be affected with long-term use – your doctor may monitor or supplement these

Quick Tips

  • Attend all scheduled blood tests for phenytoin level monitoring, especially after any dose change
  • Maintain good dental hygiene and attend regular dental check-ups to monitor for gum overgrowth
  • Never switch between different brands or formulations without your doctor’s guidance – Switching between suspension and capsule forms, or between different brands, should only be done under your doctor’s guidance, as phenytoin has a narrow therapeutic index and bioavailability can differ meaningfully between formulations.
  • Take your dose consistently at the same time(s) each day
  • Report any new or worsening rash, fever, or unusual bruising to your doctor promptly
  • Do not stop this medicine abruptly, as this can trigger seizures – your doctor will advise on any changes

Ingredients / Active Ingredients

  • Phenytoin 125mg/5ml

Safety Advice

Pregnancy

Not Advisable

Use during pregnancy is generally not recommended unless absolutely necessary.

Breastfeeding

Not Advisable

Generally not recommended while breastfeeding.

Kidney

Use With Care

Use cautiously. Dose adjustment or monitoring may be required.

Liver

Use With Care

Use cautiously. Liver function monitoring may be required.

Alcohol

Not Advisable

It is not advisable to consume alcohol while taking this medicine.

Driving

Use With Care

Use caution while driving until you know how this medicine affects you.

Frequently Asked Questions

Product Specifications

BrandViatris
ManufacturerViatris
ClassificationPrescription medicine
Ingredients / Active IngredientsPhenytoin
Volume237ml
Shelf LifeUse this product before the expiry date stated on the packaging. Do not use the medicine if the expiry date has passed.

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