Installment Available Dilantin 125mg/5ml Suspension
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Prescription Required
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.
Shelf Life
Use this product before the expiry date stated on the packaging. Do not use the medicine if the expiry date has passed.
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
Frequently Asked Questions
Is Dilantin 125mg/5ml Suspension a prescription medicine?
Yes. Dilantin 125mg/5ml Suspension is a prescription-only medicine (POM). It can only be supplied against a valid prescription written by a registered doctor, and it should be used only by the person named on the prescription label.
What does Dilantin 125mg/5ml Suspension contain?
Dilantin 125mg/5ml Suspension is supplied as an oral suspension and contains Phenytoin 125mg/5ml. The full composition is listed in the Composition section on this page and on the product packaging.
Why is there no information here about what Dilantin 125mg/5ml Suspension is for?
Malaysian rules for prescription medicines limit public product pages to product, safety and handling information. Your doctor decides whether this medicine is appropriate for you and will explain it during your consultation, and your pharmacist can answer further questions when the medicine is dispensed.
How should I take Dilantin 125mg/5ml Suspension?
Take it exactly as written on your prescription label. Do not increase, reduce or skip doses on your own, and do not continue beyond the period your doctor has prescribed. Practical handling steps are set out in the Directions for Use section on this page.
What should I do if I miss a dose?
Take it as soon as you remember, unless your next dose is nearly due. In that case skip the missed dose and carry on with your usual schedule. Never take two doses together to make up for a missed one. If you miss doses often, tell your doctor or pharmacist.
How should I store Dilantin 125mg/5ml Suspension?
Store below 30°C in a dry place, away from direct sunlight and out of reach of children. Keep it in the original pack until use, and do not use it after the expiry date printed on the packaging.
What should I do if I notice side effects?
Tell your doctor or pharmacist about any reaction that concerns you, and seek medical care immediately for signs of a severe reaction such as difficulty breathing, swelling of the face, lips or throat, or a widespread rash. Reported reactions are listed in the Side Effects section on this page.
Can I stop taking Dilantin 125mg/5ml Suspension on my own?
No. Speak to your doctor before stopping, pausing or changing the dose, even if you feel well or think you no longer need the medicine.
How do I get a prescription for Dilantin 125mg/5ml Suspension?
Customers in Malaysia can complete an online consultation with a DoctorOnCall doctor, who decides whether a prescription is appropriate, or upload a valid prescription already issued by their own doctor.
Orders going to Singapore are dispatched from Malaysia as an international delivery, so you need to hold a valid prescription or doctor’s letter for the medicine. Check the consultation and prescription upload options shown at checkout for your delivery address before placing the order.
How long will delivery take?
Within Malaysia, standard delivery takes 3 to 5 working days. Same-day delivery is available in the Klang Valley for orders placed before 12pm; orders placed after 12pm arrive by the end of the next day.
Orders to Singapore are sent as international deliveries and take 5 to 9 working days. A lump-sum shipping and handling fee applies to every overseas delivery and is shown at checkout.
What payment methods can I use?
Customers in Malaysia can pay by FPX online banking, credit or debit card (Visa and Mastercard), and supported e-wallets including Touch ‘n Go eWallet, GrabPay and ShopeePay.
FPX and local e-wallets are tied to Malaysian bank and wallet accounts, so if your delivery address is in Singapore, use the payment options displayed at checkout for that address rather than assuming the same list applies.
Can Dilantin 125mg/5ml Suspension be delivered to Singapore?
Yes. DoctorOnCall ships to Singapore as an international order dispatched from Malaysia, arriving in 5 to 9 working days with a lump-sum shipping and handling fee.
Singapore’s Health Sciences Authority (HSA) allows personal imports of up to three months’ supply of a medicine for your own use or an immediate family member’s, as long as it contains no controlled drugs, psychotropic substances or prohibited items. Keep the product in its original labelled packaging and keep a copy of your prescription or doctor’s letter with it. Quantities above three months’ supply, and medicines containing controlled substances, require prior HSA approval.
Is Dilantin 125mg/5ml Suspension registered with the authorities?
Products listed on DoctorOnCall are registered with Malaysia’s Ministry of Health for supply in Malaysia, and each pack carries its MAL registration number.
An order delivered to Singapore arrives as a personal import of a Malaysia-registered product; HSA product registration is not required for personal-use quantities, but it is also not the same as a product registered for sale in Singapore. If you need a locally registered Singapore product, buy it from a pharmacy in Singapore.
Who do I contact if there is a problem with my order?
DoctorOnCall’s customer care team handles order, delivery and product queries through the contact channels on the site, including WhatsApp and the online help centre.
For deliveries to Singapore, allow more time before chasing an order than you would for a local Malaysian delivery, as the parcel passes through customs clearance and tracking updates can appear later in the journey.
Ingredients / Active Ingredients
- Phenytoin 125mg/5ml
Safety Advice
Pregnancy
Use during pregnancy is generally not recommended unless absolutely necessary.
Breastfeeding
Generally not recommended while breastfeeding.
Kidney
Use cautiously. Dose adjustment or monitoring may be required.
Liver
Use cautiously. Liver function monitoring may be required.
Alcohol
It is not advisable to consume alcohol while taking this medicine.
Driving
Use caution while driving until you know how this medicine affects you.
