Do I need a prescription to buy Sedilix-Rx Linctus?

No. Sedilix-Rx Linctus is a non-prescription product and can be ordered without a prescription. It is still dispensed by a registered pharmacist on DoctorOnCall.

What does Sedilix-Rx Linctus contain?

Sedilix-Rx Linctus is a healthcare product containing Promethazine – the sedating antihistamine and cough-suppressant component of this combination linctus. The full ingredient list is shown in the Composition or Ingredients section on this page and on the product packaging.

What pack sizes does Sedilix-Rx Linctus come in?

It is supplied in a pack size of 120ml. Choose the pack size you need from the options shown on this page before adding the item to your cart.

Why is there no information here about what Sedilix-Rx Linctus is for?

This page is limited to product, safety and handling information in line with Malaysian rules on medicine information. If you want advice on whether this product suits you, book an online consultation with a doctor or pharmacist on DoctorOnCall.

How should I use Sedilix-Rx Linctus?

Use it exactly as stated on the pack label, without changing the amount or how often you use it. If anything on the label is unclear, check with a pharmacist before the first use, and read the Directions for Use section on this page.

Can I speak to a doctor or pharmacist about Sedilix-Rx Linctus before I buy it?

Yes. DoctorOnCall offers online consultations with licensed doctors and registered pharmacists, so you can ask about this product, your existing medicines, or anything on the label before you place an order.

What should I do if I notice side effects after using Sedilix-Rx Linctus?

Stop using the product and speak to a doctor or pharmacist about any reaction that concerns you. 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.

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 Sedilix-Rx Linctus 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 Sedilix-Rx Linctus 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.

Sedilix-Rx Linctus cough suppressant antihistamine sedating | DoctorOnCall Malaysia

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Reviewed byDr. Mohd Izzat Amir Bin AwangDoctor of Medicine (MD), University of Mansoura - Manchester

Written byDr. Chong Zhan PongDoctor of Medicine (MD), International Medical University (IMU)

Last updated: October 15, 2026

Overview

Sedilix-Rx Linctus is supplied as a healthcare product, with Promethazine – the sedating antihistamine and cough-suppressant component of this combination linctus. It is supplied in a pack size of 120ml.

No prescription is required for this product, as it is a non-prescription medicine. This page is limited to product, safety and handling information.

If you would like guidance before buying, you can speak to a doctor or pharmacist through an online consultation on DoctorOnCall. Orders are dispensed by a registered pharmacist and delivered to your address.

Directions for Use

Take Sedilix-Rx Linctus exactly as prescribed by your doctor, using the measuring cup or spoon provided rather than a regular household spoon, to ensure an accurate dose. Because it commonly causes drowsiness, your doctor may advise taking it in the evening or at bedtime.

Dosage

Your doctor will determine the appropriate dose and frequency based on your age, symptoms, and medical history; this should be followed exactly as prescribed and never exceeded. Do not give this medicine to children unless specifically prescribed for them, as sedating antihistamine-based linctus preparations require particular caution in younger age groups.

Shelf Life

Sedilix-Rx Linctus is generally stable until the expiry date printed on the bottle and carton when unopened and stored correctly. Once opened, check the label or ask your pharmacist for the recommended in-use period, and do not use the linctus past its expiry date.

Storage Instructions

Store below 25°C in a cool, dry place away from direct sunlight, and keep the bottle tightly closed between doses. Keep out of the sight and reach of children at all times, given the sedative nature of this medicine.

Side Effects

Drowsiness or dizziness
Nausea or vomiting
Stomach discomfort
Mild confusion (especially at high doses)
Dry mouth

Contraindications

Known hypersensitivity to promethazine or other antihistamines
Young children, in whom promethazine-based linctus preparations require particular caution due to the risk of sedation and breathing-related effects
Narrow-angle glaucoma
Severe liver disease
Use during pregnancy or breastfeeding without a doctor’s specific advice

Drug / Food Interactions

Alcohol — increases sedation and should be avoided
Other sedating medicines such as sleeping tablets, other antihistamines, or opioid painkillers — additive drowsiness
Monoamine oxidase inhibitors (MAOIs) — may prolong or intensify antihistamine effects
Other medicines with anticholinergic effects — may increase dry mouth, constipation, or urinary retention
Central nervous system depressants generally should be used with caution alongside this medicine

Quick Tips

Avoid alcohol while taking this medicine, as it increases drowsiness
Do not drive or operate machinery until you know how the medicine affects you
Take it exactly as prescribed and do not adjust the dose without speaking to your doctor
Report excessive drowsiness, confusion, or breathing difficulty to your doctor promptly
Keep your follow-up appointment if your doctor advises one, especially if symptoms persist beyond a week

Ingredients / Active Ingredients

Dextromethorphan

Promethazine – the sedating antihistamine and cough-suppressant component of this combination linctus
Other supporting cough/cold linctus ingredients and excipients as formulated by the manufacturer (refer to the product packaging or your pharmacist for the complete ingredient list)

Safety Advice

Pregnancy

Safe If Prescribed

This medicine should only be used during pregnancy if prescribed by a doctor after careful evaluation.

Breastfeeding

Limited Data

Limited data on excretion in breast milk. Consult a doctor before use.

Kidney

Generally Safe

Generally safe, but caution may be required in some patients.

Liver

No Data

No adequate data available. Consult a doctor before use.

Alcohol

Not Advisable

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

Driving

Not Advisable

It is not advisable to drive if you experience side effects from this medicine.

Relevant Information

Because Sedilix-Rx Linctus is prescription-only, ongoing use should be guided by your doctor, particularly in children, the elderly, and anyone with existing medical conditions, as these groups are more sensitive to the sedative and anticholinergic effects of promethazine. If your cough persists beyond the period advised by your doctor or is accompanied by fever, breathlessness, or chest pain, seek medical review rather than continuing the linctus alone.