Irbesartan and hydrochlorothiazide
Consumer Medicine Information
What is in this leaflet
This leaflet answers some common questions about irbesartan HCTZ. It does not contain
all the available information. It does not take the place of talking to your doctor
All medicines have risks and benefits. Your doctor has weighed the risks of you using
this medicine against the benefits they expect it will have for you.
If you have any concerns about taking this medicine, ask your doctor or pharmacist.
Keep this leaflet with the medicine.
You may want to read it again.
What this medicine is used for
Irbesartan HCTZ is used to treat high blood pressure (hypertension).
Everyone has blood pressure. This pressure helps get your blood all around your body.
Your blood pressure may be different at different times of the day, depending on how
busy or worried you are. You have high blood pressure which means your blood pressure
stays high, even when you are calm and relaxed.
There are usually no symptoms of high blood pressure. The only way of knowing that
you have hypertension is to have your blood pressure checked on a regularly basis.
How it works
This product contains both irbesartan and hydrochlorothiazide (HCTZ). Both medicines
reduce blood pressure in different ways.
Irbesartan belongs to a group of medicines known as angiotensin-II receptor antagonists.
Angiotensin II is a substance produced in the body which causes blood vessels to tighten.
Irbesartan blocks angiotensin-II and therefore relaxes your blood vessels. This helps
to lower your blood pressure.
HCTZ belongs to the class of medicines known as diuretics. Diuretics cause an increase
in the volume of urine. They also help with lowering blood pressure particularly when
combined with other blood pressure reducing medicines.
Ask your doctor if you have any questions about why this medicine has been prescribed
Your doctor may have prescribed this medicine for another reason.
This medicine is available only with a doctor's prescription.
This medicine is not addictive.
There is not enough information to recommend the use of this medicine for children.
Before you take this medicine
When you must not take it
Do not take this medicine if you have an allergy to:
sulfonamide derived medicines,
any of the ingredients listed at the end of this leaflet.
Some of the symptoms of an allergic reaction may include:
shortness of breath
wheezing or difficulty breathing
swelling of the face, lips, tongue, throat or other parts of the body
itching or hives on the skin.
Do not take this medicine if you are pregnant or intend to become pregnant.
Irbesartan HCTZ may affect your developing baby if you take it during pregnancy.
Do not take this medicine if you are not producing urine.
Do not take this medicine if you are taking a medicine containing aliskiren and either
have diabetes or moderate to severe kidney impairment.
Do not take this medicine if you have damage to your kidneys caused by diabetes, called
'diabetic nephropathy', and are on an ACE inhibitors or a group of medicines known
as AIIRAs (medicines also used to treat high blood pressure).
Do not take this medicine after the expiry date printed on the pack or if the packaging
is torn or shows signs of tampering.
Before you start to take it
Tell your doctor if you have allergies to any other medicines, foods, preservatives
Tell your doctor if you have or have had any of the following medical conditions:
psoriasis or a history of psoriasis
kidney problems, kidney transplant or dialysis
high or low levels of potassium or sodium or other electrolytes in your blood or you
are restricting your salt intake
allergies or asthma
recent excessive vomiting or diarrhoea, dehydration
hypersensitivity to, or have had an allergic reaction to, penicillin
you have had skin cancer, or you develop an unexpected skin lesion during the treatment.
Treatment with hydrochlorothiazide, particularly long-term use with high doses, may
increase the risk of some types of skin and lip cancer (non-melanoma skin cancer).
Protect your skin from sun exposure and UV rays while taking irbesartan HCTZ.
Do not take this medicine if you are taking diuretics.
Do not take this medicine if you are breastfeeding until you and your doctor have
discussed the risks and benefits involved.
Do not take this medicine if you are planning to have surgery, dental treatment or
If you have not told your doctor about any of the above, tell them before you start
taking this medicine.
Taking other medicines
Tell your doctor and pharmacist if you are taking any other medicines. This includes
vitamins and supplements that are available from your pharmacy, supermarket or health
Some medicines may interact with irbesartan HCTZ. These include:
medicines for the heart or high blood pressure (e.g. digoxin, sotalol, other fluid
tablets or diuretics)
lithium, used for mood disorders
potassium tablets, potassium containing salt substitutes or other medicinal products
that may increase potassium levels in the blood (trimethoprim-containing medicines)
anti-inflammatory medicines such as NSAIDs used to relieve pain. Taking a combination
of irbesartan HCTZ and an anti-inflammatory medicine may damage your kidneys
strong pain killing medicines such as codeine or morphine
medicines for diabetes (oral tablets/capsules or insulins or a medicine containing
calcium supplements, medicines containing calcium or calcium sparing drugs (e.g. Vitamin
medicines for gout
powder or granules used to help reduce cholesterol
corticosteroid medicines such as prednisone, cortisone or ACTH
medicines used to treat cancer (cytotoxic medicines)
medicines used to treat Parkinson's disease (e.g. amantadine) or anticholinergic medicines
to relieve stomach cramps, spasms or used to prevent travel sickness
carbamazepine, used for epilepsy
medicines used during surgery
medicines used in an emergency such as adrenaline.
If you are taking any of these, you may need a different dose, or you may need to
take different medicines.
Other medicines not listed above may also interact with irbesartan HCTZ.
How to take this medicine
Follow carefully all directions given to you by your doctor.
They may differ to the information contained in this leaflet.
How much to take
Your doctor will tell you how much of this medicine you should take, depending on
your condition and if you are taking any other medicines.
The usual dose is one tablet taken once a day.
Depending on how your blood pressure responds, your doctor may change your dose.
How to take it
The tablets should be swallowed whole with a glass of water.
When to take it
Take this medicine at about the same time each day.
Taking it at the same time each day will have the best effect. It will also help you
remember when to take it.
To help you remember to take your tablets each day, Blooms The Chemist Irbesartan
HCTZ tablets are supplied in a Calendar pack with the foil backing marked with the
days of the week. This may help you to remember to take your tablets. All the tablets
in the pack are the same.
When you start a new strip of tablets, take the tablet marked "START". On the next
day, take the tablet marked with the relevant day of the week.
Continue taking your tablets each day until all the tablets are taken. Commence the
next strip at "START" and continue as before.
It does not matter if you take this medicine before or after food.
How long to take it
Continue taking your medicine for as long as your doctor tells you.
Make sure you have enough to last over weekends and holidays.
If you forget to take it
If it is almost time to take your next dose, skip the missed dose and take your next
dose at the usual time.
Otherwise take it as soon as you remember and then go back to taking your medicine
as you would normally.
Do not take a double dose to make up for missed doses.
This may increase the chance of unwanted side effects.
If you have trouble remembering to take your medicine, ask your pharmacist for some
If you take too much (overdose)
Immediately telephone your doctor or the Poisons Information Centre (telephone 13
11 26) for advice or go to the Emergency Department at your nearest hospital if you
think that you or anyone else may have taken too much of this medicine. Do this even
if there are no signs of discomfort or poisoning. You may need urgent medical attention.
While you are using this medicine
Things you must do
If you are about to be started on any new medicine, tell your doctor and pharmacist
that you are taking this medicine.
Tell any other doctors, dentists and pharmacists who are treating you that you take
Tell your doctor immediately if you become pregnant whilst taking this medicine.
Tell your doctor if you are about to have any blood tests, surgery or dental treatment,
especially any treatment that may need anaesthetic.
Get up slowly when getting out of bed or standing up especially during the first few
doses or if your dose is increased.
You may feel light-headed or dizzy while taking this medicine. This may become worse
if you stand up quickly as your blood pressure may fall. Standing up slowly, especially
when you get up from bed or chairs, will help your body get used to the change in
position and blood pressure. If this occurs, talk to your doctor.
Make sure you drink enough water during exercise and hot weather, especially if you
sweat a lot.
If you do not drink enough water, you may faint or feel lightheaded or sick. This
is because your body does not have enough fluid and your blood pressure is low. If
you continue to feel unwell, tell your doctor.
If you have excessive vomiting and/or diarrhoea while taking this medicine, tell your
This can also mean that you are losing too much water and your blood pressure may
become too low.
Tell your doctor if you experience an increased sensitivity of the skin to the sun
with symptoms of sunburn (such as redness, itching, swelling, blistering) occurring
more quickly than normal.
Go to your doctor regularly for a check-up.
Your doctor may occasionally do tests to make sure the medicine is working and to
prevent side effects.
Things you must not do
Do not give this medicine to anyone else, even if they have the same condition as
Do not take your medicine to treat any other complaint unless your doctor tells you
Do not stop taking your medicine, or change the dosage, without first checking with
Things to be careful of
Be careful when driving or operating machinery until you know how this medicine affects
As with many other medicines used to treat high blood pressure, irbesartan HCTZ may
cause dizziness or light-headedness in some people. If you drink alcohol, dizziness
or light-headedness may be worse.
The hydrochlorothiazide contained in this medicine could produce a positive analytical
result in an anti-doping test.
Tell your doctor and pharmacist as soon as possible if you do not feel well while
you are taking irbesartan HCTZ.
All medicines can have side effects. Sometimes they are serious but most of the time
they are not.
Do not be alarmed by the following lists of side effects. You may not experience any
Tell your doctor if you notice any of the following:
dizziness or light-headedness
unusual tiredness or weakness, fatigue
pain in the stomach or gut; nausea and/or vomiting
Tell your doctor as soon as possible if you notice any of the following:
skin rash or itchiness
aching muscles or aching joints, not caused by exercise
muscle pain, weakness or paralysis of muscles
buzzing, ringing or other persistent noise in the ears
blurred vision, eye pain
changes in heart rhythm
you are not urinating (passing water) as much as normal
numbness or tingling in fingers or toes
painful, swollen joints which may be symptoms of gout
excessive thirst, passing greatly increased amounts of urine, increased appetite with
weight loss, feeling tired, drowsy, weak, depressed, irritable and generally unwell
(signs of diabetes)
passing little or no urine, drowsiness, nausea, vomiting, breathlessness, loss of
appetite and weakness (signs of kidney disease)
nausea, diarrhoea, muscle weakness and changes in heart rhythm (signs of high potassium
levels in the blood)
nausea, vomiting, loss of appetite, feeling generally unwell, fever, itching, yellowing
of the skin and eyes (jaundice) and dark coloured urine (signs of liver disease)
exacerbation of psoriasis
disturbances in your vision (such as blurred vision and seeing haloes around lights)
and eye pain
The above list includes serious side effects that may need medical attention:
If any of the following occur, tell your doctor immediately or go to the Emergency
department at your nearest hospital:
cough, shortness of breath, wheezing or difficulty breathing; swelling of the face,
lips, tongue, or other parts of the body; rash, itching or hives on the skin; fainting,
hay fever-like symptoms (signs of an allergic reaction)
Tell your doctor or pharmacist if you notice anything that is making you feel unwell.
Other side effects not listed above may occur in some patients.
Storage and Disposal
Keep your medicine in its original packaging until it is time to take it.
If you take your medicine out of its original packaging it may not keep well.
Keep your medicine in a cool dry place where the temperature will stay below 25°C.
Do not store your medicine, or any other medicine, in the bathroom or near a sink.
Do not leave it on a windowsill or in the car.
Heat and dampness can destroy some medicines.
Keep this medicine where children cannot reach it.
A locked cupboard at least one-and-a-half metres above the ground is a good place
to store medicines.
If your doctor tells you to stop taking this medicine or they have passed their expiry
date, your pharmacist can dispose of the remaining medicine safely.
What it looks like
150/12.5 mg tablets
Peach, oval, biconvex film-coated tablet debossed with "L183" on one side and plain
on the other side. AUST R 259572.
300/12.5 mg tablets
Peach, oval, biconvex film-coated tablet debossed with "L184" on one side and plain
on the other side. AUST R 259592
300/25 mg tablets
Pinkish brown, oval, biconvex film-coated tablet debossed with "L185" on one side
and plain on the other side.
AUST R 259612
Available in blister packs of 30 tablets.
* Not all strengths may be available.
Each tablet contains either 150 mg or 300 mg of irbesartan and 12.5 mg or 25 mg of
hydrochlorothiazide as the active ingredients.
It also contains the following inactive ingredients:
pigment blend PB-24899 (ARPING 107861 consisting of iron oxide red, iron oxide yellow
150/12.5 and 300/12.5 tablets also contain Opadry II complete film coating system
30F84418 pink (ARPING 107862 consisting of iron oxide yellow, iron oxide red, hypromellose,
lactose, macrogol 4000 and titanium dioxide)
300/25 tablets also contain Opadry II complete film coating system 30F86974 brown
(ARPING 107863 consisting of iron oxide yellow, iron oxide red, iron oxide black,
hypromellose, lactose, macrogol 4000 and titanium dioxide).
This medicine does not contain gluten, tartrazine or any other azo dyes.
Apotex Pty Ltd
16 Giffnock Avenue
Macquarie Park NSW 2113
This leaflet was last updated in June 2020.