Macitentan (ma-SEE-ten-tan) 10 mg Tablets
Consumer Medicine Information
What is in this leaflet
This leaflet answers some common questions about OPSUMIT.
It does not contain all the available information. It does not take the place of talking
to your doctor or pharmacist.
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 using this medicine, speak to your doctor or pharmacist.
Keep this leaflet with the medicine.
You may need to read it again.
What OPSUMIT is used for
OPSUMIT tablets contain macitentan which belongs to the class of medicines called
"endothelin receptor antagonists".
OPSUMIT is used for the treatment of pulmonary arterial hypertension (PAH), it can
be used on its own or with other drugs to treat PAH. PAH is high blood pressure in
the blood vessels (the pulmonary arteries) that carry blood from the heart to the
lungs. In people with PAH, these arteries get narrower, so the heart has to work harder
to pump blood through them. This causes people to feel tired, dizzy, and short of
OPSUMIT widens the pulmonary arteries, making it easier for the heart to pump blood
through them. This lowers the blood pressure and relieves the symptoms and improves
the course of the disease.
Your doctor however, may prescribe OPSUMIT for another purpose.
Ask your doctor if you have any questions about why it has been prescribed for you.
Before you take OPSUMIT
When you must not take OPSUMIT
Do NOT take OPSUMIT if you are pregnant or if you are planning to become pregnant,
or if you could become pregnant because you are not using reliable birth control (contraception).
Talk to you doctor about what birth control methods are reliable whilst taking OPSUMIT.
Tell your doctor if you are breast-feeding. You are advised to stop breast-feeding
if OPSUMIT is prescribed for you, because it is not known whether this medicine passes
into human breast milk.
Male fertility - the potential risk for humans is unknown. Talk to your doctor if
you have any questions or concerns about this.
Do not take OPSUMIT if you have ever had an allergic reaction to macitentan or any
of the ingredients listed at the end of this leaflet.
Symptoms of an allergic reaction may be mild or severe. They usually include some
or all of the following: wheezing, swelling of the lips/mouth, difficulty in breathing,
hay fever, lumpy rash (hives) or fainting.
OPSUMIT contains small amounts of a sugar called lactose. If you have an intolerance
to lactose or any other sugars tell your doctor.
Do not take OPSUMIT if you have liver disease or if you have very high levels of liver
enzymes in your blood. Talk to you doctor, who will decide if this medicine is suitable
Do not use OPSUMIT after the expiry date [EXP.] printed on the pack.
If you use it after the expiry date has passed, it may not work as well.
Do not use OPSUMIT if the packaging is torn or shows signs of tampering.
If you're not sure whether you should be using OPSUMIT, talk to your doctor. The safety
and efficacy of OPSUMIT has not been proven in patients under 12 years of age.
Before you start to take OPSUMIT
You must tell your doctor if:
you are allergic to foods, dyes, preservatives or any other medicines,
you are pregnant, trying or become pregnant,
you are breast-feeding,
you have liver problems,
you have kidney problems,
you have low blood pressure,
you have anaemia or low red blood cells.
Your doctor will also order some blood tests before you start treatment with OPSUMIT
and also during treatment with OPSUMIT, this is to test:
whether you have anaemia (a reduced number of red blood cells)
whether your liver is working properly.
Signs that your liver may not be working properly include:
nausea (urge to vomit)
fever (high temperature)
pain in your stomach (abdomen)
jaundice (yellowing of your skin or the whites of your eyes)
itching of your skin
lethargy or fatigue (unusual tiredness or exhaustion)
flu-like syndrome (joint and muscle pain with fever)
If you notice any of these signs, tell your doctor immediately.
Pregnancy and Breast-feeding
Don't take OPSUMIT if you or your partner are pregnant or planning to become pregnant
as it may harm unborn babies conceived before, during or soon after treatment.
You must not become pregnant for at least 3 months after stopping OPSUMIT.
If you are a woman who could become pregnant, your doctor will ask you to take a pregnancy
test before you take OPSUMIT.
If you are a male you should avoid exposing your partner to your semen by use of appropriate
If it's possible you could become pregnant, use at least two reliable forms of birth
control (contraception) while you're taking OPSUMIT. You must continue to use contraception
for at least 3 months after stopping OPSUMIT. Talk to your doctor about this.
If you do become pregnant, talk to your doctor immediately.
Don't breast feed while you are taking OPSUMIT.
Taking Other medicines
You must tell you doctor if you are taking:
rifampicin, clarithromycin, (used to treat infections)
phenytoin (a medicine used to treat seizures)
carbamazepine (a medicine used to treat depression and epilepsy)
St John's Wort (a herbal preparation used to treat depression)
ritonavir, saquinavir (used to treat HIV infections)
ketoconazole (except shampoo), itraconazole, voriconazole (medicines used to treat
You are taking any other medicines, including medicines you buy without a prescription
from a pharmacy, supermarket or health food shop.
Some medicines may affect the way other medicines work. Your doctor or pharmacist
will be able to tell you what to do when using OPSUMIT with other medicines.
How to take OPSUMIT
Always take this medicine exactly as your doctor has told you. Check with your doctor
if you are not sure.
How much to take
The recommended dose of OPSUMIT for adults and children over 12 years of age and weighing
more than 40 kg is one 10 mg tablet, once a day. Swallow the whole tablet, with a
glass of water, do not chew or break the tablet.
You can take OPSUMIT with or without food.
How long to take it
Use OPSUMIT for as long as your doctor advises you to. OPSUMIT is generally used over
a prolonged period of time, possibly years. It should not be stopped suddenly.
If you use too much (overdose)
If you have taken more tablets than you have been told to take, ask your doctor for
If you forget to take it
If you forget to take OPSUMIT, take a dose as soon as you remember, then continue
to take your tablets at the usual times. Do not take a double dose to make up for
a forgotten tablet.
While you are using OPSUMIT
Things you must do
Tell your doctor or pharmacist that you are taking OPSUMIT if you are about to start
on any new medicines.
Tell your doctor if you become pregnant or are trying to become pregnant.
Tell your doctor if, for any reason, you have not used your medicine exactly as prescribed.
Things you must not do
OPSUMIT is a treatment that you will need to keep on taking to control your PAH. Do
not stop taking OPSUMIT unless you have agreed this with your doctor.
If you have any further questions on the use of OPSUMIT, ask your doctor or pharmacist.
Do not give this medicine to anyone else, even if their symptoms seem similar to yours.
Do not use OPSUMIT to treat any other complaints unless your doctor says to.
Things to be careful of
As with many other medicines, OPSUMIT may cause headaches in some people.
Be careful driving or operating machinery until you know how OPSUMIT affects you.
If you are affected, do not drive or operate machinery.
Check with your doctor as soon as possible if you have any problems while taking OPSUMIT,
even if you do not think the problems are connected with the medicine or are not listed
in this leaflet.
Like all medicines, OPSUMIT can cause side effects in some people.
Tell your doctor at once if you experience any of the following while you are receiving
Very common side effects
anaemia (low number of red blood cells) or haemoglobin decreases
bronchitis (inflammation of the airways)
nasopharyngitis (inflammation of the throat & nasal passages)
oedema/fluid retention (swelling)
Common side effects
pharyngitis (inflammation of the throat)
urinary tract infection (bladder infection)
hypotension (low blood pressure)
pruritus (severe itching of the skin)
If you get any side effects, talk to your doctor or pharmacist. This includes any
possible side effects not listed in this leaflet.
Do not be alarmed by this list of possible side effects.
You may not experience any of them.
This is not a complete list of all possible side-effects. Others may occur in some
people and there may be some side-effects not yet known.
Tell your doctor if you notice anything else that is making you feel unwell, even
if it is not on this list.
Ask your doctor if you don't understand anything in this list.
Keep this medicine where young children cannot reach it.
A locked cupboard at least one-and-a half metres above the ground is a good place
to store medicines.
Do not leave them in the car or on window sills.
Do not use this medicine after the expiry date which is stated on the carton after
EXP. The expiry date refers to the last day of that month.
Do not store above 30°C.
Medicines should not be disposed of in wastewater or household waste.
Ask your pharmacist how to dispose of medicines you no longer require. These measures
will help to protect the environment.
What it looks like
OPSUMIT 10 mg tablets are white to off white, biconvex, round, film-coated tablets
with "10" on two sides.
OPSUMIT is supplied as 10 mg film-coated tablets in blister packs of, 9 or 30 tablets.
Each tablet of OPSUMIT contains 10 mg of macitentan.
sodium starch glycollate type A
OPSUMIT® is supplied in Australia by Actelion Pharmaceuticals Australia Pty Limited.
13b Narabang Way
Belrose NSW 2085
OPSUMIT is distributed in NZ by
Pharmacy Retailing (NZ) Ltd t/a Healthcare Logistics
58 Richard Pearse Drive
Airport Oaks, Auckland NZ.
This leaflet was prepared in February 2018.
OPSUMIT 10 mg tablets packs:
blister packs of 9 tablets AUST R 205624
blister packs of 30 tablets AUST R 205624