Harnal Ocas 400mcg Tablet

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Manufacturer Astellas
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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

Harnal Ocas 400mcg Tablet is a prescription-only medicine (POM) that contains Tamsulosin hydrochloride 400mcg (modified-release). It is supplied as a tablet and is dispensed in Malaysia only against a valid prescription issued by a registered doctor.

Under Malaysian rules for prescription medicines, this page carries product, safety and handling information only. Your doctor or pharmacist will explain whether this medicine is suitable for you, the dose you should take, and how long you should take it.

On DoctorOnCall, Harnal Ocas 400mcg Tablet is reviewed by a licensed doctor through an online consultation and dispensed by a registered pharmacist before delivery. Always follow the instructions on your prescription label and the package insert supplied with the product, and do not share this medicine with anyone else.

Directions for Use

Take Harnal Ocas 400mcg Tablet once daily, after breakfast or the first meal of the day, at approximately the same time each day. Swallow the tablet whole with a glass of water – do not crush, chew, or break it, as this is a modified-release formulation designed to release the medicine slowly over the day.

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
  • Runny or stuffy nose
  • Ejaculation problems
  • Headache
  • Weakness or fatigue
  • Upset stomach
  • Back pain

Contraindications

  • Known hypersensitivity to tamsulosin or any ingredient in this product
  • History of orthostatic (postural) hypotension
  • Severe liver impairment
  • Use is not applicable in women or children, as this medicine is indicated only for BPH in men

Drug / Food Interactions

  • Other alpha-blockers may cause additive blood-pressure-lowering effects and should generally not be combined
  • PDE5 inhibitors (e.g. sildenafil, tadalafil) taken together can increase the risk of low blood pressure and dizziness
  • Strong CYP3A4 inhibitors (e.g. ketoconazole, ritonavir) may increase tamsulosin blood levels
  • Warfarin’s effect may require closer monitoring if combined with tamsulosin

Quick Tips

  • Tell your ophthalmologist that you take this medicine before any cataract or other eye surgery, as it can cause intraoperative floppy iris syndrome (IFIS)
  • Rise slowly from sitting or lying down, especially with the first few doses, to reduce dizziness or fainting
  • Take after the same meal each day for consistent absorption
  • Do not crush or chew the tablet – swallow it whole
  • Tell your doctor if you are also taking medicines for erectile dysfunction, as the combination can increase the risk of low blood pressure

Ingredients / Active Ingredients

  • Tamsulosin hydrochloride 400mcg (modified-release)

Safety Advice

Pregnancy

Limited Data

Limited information is available regarding use during pregnancy. Use only if clearly needed.

Breastfeeding

Limited Data

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

Kidney

Use With Care

Use cautiously. Dose adjustment or monitoring may be required.

Liver

Limited Data

Limited data available in liver disease patients.

Alcohol

Use With Care

Caution is advised when consuming alcohol with this medicine.

Driving

Not Advisable

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

Frequently Asked Questions

Product Specifications

BrandAstellas
ManufacturerAstellas
ClassificationPrescription medicine
Ingredients / Active IngredientsTamsulosin
Pack Size30s
DosageThe usual dose of Harnal Ocas 400mcg Tablet is one tablet (400mcg) once daily, taken after the same meal each day. Your doctor will confirm the correct dose and duration of treatment based on your symptoms and response.
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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