Pretenol C 100mg Tablet

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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

Pretenol C 100mg Tablet is a prescription-only medicine (POM) presented as a tablet, with Atenolol 100mg and Chlorthalidone 25mg 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

Take Pretenol C 100mg Tablet at the same time each day, with or without food, and swallow the tablet whole with a glass of water. Do not stop taking this medicine suddenly, even if you feel well, as abruptly stopping a beta-blocker can cause a rebound rise in blood pressure or worsen chest pain – your doctor will advise on gradually reducing the dose if it needs to be stopped.

Dosage

Pretenol C 100mg Tablet is usually taken once daily as directed by your doctor, who will decide whether this strength is appropriate for you based on your blood pressure response and tolerability. Do not adjust your dose or switch between the 50mg and 100mg strengths without your doctor’s advice.

Storage Instructions

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

Side Effects

  • Dizziness or lightheadedness
  • Tiredness or fatigue
  • Cold hands and feet
  • Slower heart rate
  • Nausea
  • Shortness of breath in some cases

Contraindications

  • Known hypersensitivity to atenolol, chlorthalidone, other sulfonamide-derived medicines, or any ingredient in this product
  • Severe bradycardia (very slow heart rate) or certain heart conduction disorders
  • Uncontrolled heart failure
  • Severe asthma or bronchospasm
  • Severe kidney impairment or anuria (inability to pass urine)

Drug / Food Interactions

  • NSAIDs (e.g. ibuprofen) may reduce the blood-pressure-lowering effect and affect kidney function
  • Other antihypertensive medicines may increase the risk of low blood pressure
  • Digoxin combined with the low potassium levels chlorthalidone can cause increases the risk of heart rhythm disturbances
  • Lithium levels may rise when combined with chlorthalidone, requiring closer monitoring

Quick Tips

  • Never stop this medicine suddenly – your doctor will taper the dose if it needs to be discontinued
  • Monitor your blood pressure regularly as advised by your doctor
  • Attend scheduled blood tests to check your potassium and kidney function
  • Report muscle cramps, unusual tiredness, or an irregular heartbeat to your doctor
  • Limit alcohol intake, as it can worsen dizziness and blood pressure control

Ingredients / Active Ingredients

  • Atenolol 100mg
  • Chlorthalidone 25mg

Safety Advice

Pregnancy

Use With Care

This medicine should be used cautiously during pregnancy. Monitoring may be required.

Breastfeeding

Use With Care

Use with caution. Monitor infant for potential adverse reactions.

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

Use With Care

Caution is advised when consuming alcohol with this medicine.

Driving

Use With Care

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

Frequently Asked Questions

Product Specifications

BrandDuopharma
ClassificationPrescription medicine
Ingredients / Active IngredientsAtenolol
Pack Size30s
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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