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Active substance(s): ATENOLOL

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Package leaflet: Information for the patient

Tenormin 100 mg Tablets

Read all of this leaflet carefully
before you start taking this medicine
because it contains important
information for you.
• Keep this leaflet. You may need to
read it again.
• If you have any further questions,
ask your doctor or pharmacist.
• This medicine has been prescribed
for you only. Do not pass it on to
others. It may harm them, even if
their signs of illness are the same
as yours.
• If you get any side effects, talk
to your doctor or pharmacist.
This includes any possible side
effects not listed in this leaflet.
See section 4.
What is in this leaflet
1. What Tenormin is and what it is
used for
2. What you need to know before
you take Tenormin
3. How to take Tenormin
4. Possible side effects
5. How to store Tenormin
6. Contents of the pack and other
1. What Tenormin is and what it is
used for
Tenormin contains a medicine called
atenolol. This belongs to a group of
medicines called beta‑blockers.
Tenormin is used to:
• Treat high blood pressure
• Treat uneven heart beats
• Help prevent chest pain (angina).
• Protect the heart in the early
treatment after a heart attack
(myocardial infarction).
It works by making your heart beat
more slowly and with less force.
2. What you need to know before
you take Tenormin
Do not take Tenormin:
• If you are allergic to atenolol or
any of the other ingredients of this
medicine (listed in section 6).
• If you have ever had any of the
following heart problems:
- heart failure which is not under
control (this usually makes you
breathless and causes your
ankles to swell)
- second- or third-degree heart
block (a condition which may
be treated by a pacemaker)
- very slow or very uneven heart
beats, very low blood pressure
or very poor circulation.
• If you have a tumour called
phaeochromocytoma that is not
being treated. This is usually near
your kidney and can cause high
blood pressure. If you are being
treated for phaeochromocytoma,
your doctor will give you another
medicine, called an alpha-blocker,
to take as well as Tenormin.
• If you have been told that you have
higher than normal levels of acid in
your blood (metabolic acidosis).
Do not take Tenormin if any of the
above apply to you. If you are not
sure, talk to your doctor or pharmacist
before taking Tenormin.
Warnings and precautions
Talk to your doctor or pharmacist
before taking Tenormin if:
• You have asthma, wheezing
or any other similar breathing
problems, or you get allergic
reactions, for example to insect
stings. If you have ever had
asthma or wheezing, do not
take this medicine without first
checking with your doctor.
• You have a type of chest pain
(angina) called Prinzmetal’s angina.
• You have poor blood circulation or
controlled heart failure.
• You have first-degree heart block.
• You have diabetes. Your medicine
may change how you respond to
having low blood sugar. You may
feel your heart beating faster.
• You have thyrotoxicosis (a condition
caused by an overactive thyroid
gland). Your medicine may hide
the symptoms of thyrotoxicosis.
• You have problems with your
kidneys. You may need to have
some check-ups during your

If you are not sure if any of the above
apply to you, talk to your doctor or
pharmacist before taking Tenormin.
Other medicines and Tenormin
Tell your doctor or pharmacist if you are
taking, have recently taken or might
take any other medicines. This includes
medicines that you buy without a
prescription and herbal medicines. This
is because Tenormin can affect the way
some other medicines work and some
medicines can have an effect on
In particular, tell your doctor if you are
taking any of the following medicines:
• Clonidine (for high blood pressure
or migraine). If you are taking
clonidine and Tenormin together,
do not stop taking clonidine unless
your doctor tells you to do so. If
you have to stop taking clonidine,
your doctor will give you careful
instructions about how to do it.
• Verapamil, diltiazem and nifedipine
(for high blood pressure or chest
• Disopyramide, quinidine or
amiodarone (for an uneven heart
• Digoxin (for heart problems).
• Adrenaline, also known as
epinephrine (a medicine that
stimulates the heart).
• Ibuprofen or indometacin (for pain
and inflammation).
• Insulin or medicines that you take
by mouth for diabetes.
• Medicines to treat nose or sinus
congestion or other cold remedies
(including those you can buy in the
If you go into hospital to have an
operation, tell the anaesthetist or
medical staff that you are taking
Tenormin. This is because you can
get low blood pressure (hypotension)
if you are given certain anaesthetics
while you are taking Tenormin.
Pregnancy, breast-feeding and
If you are pregnant or breast-feeding,
think you may be pregnant or are
planning to have a baby, ask your
doctor or pharmacist for advice
before taking this medicine.
Driving and using machines
• Your medicine is not likely to affect
you being able to drive or use
any tools or machines. However,
it is best to wait to see how your
medicine affects you before trying
these activities.
• If you feel dizzy or tired when
taking this medicine, do not drive
or use any tools or machines.
3. How to take Tenormin
Always take this medicine exactly as
your doctor or pharmacist has told you.
Check with your doctor or pharmacist
if you are not sure.
• Your doctor will tell you how many
tablets to take each day and when
to take them. Read the label on
the carton to remind you what the
doctor said.
• Swallow your Tenormin tablet whole
with a drink of water.
• Try to take your tablet at the same
time each day.
• High blood pressure (hypertension):
the recommended dose is 50 mg
to 100 mg a day.
• Chest pain (angina): the
recommended dose is 100 mg a
day or 50 mg twice a day.
• Uneven heart beats (arrhythmias):
the recommended dose is 50 mg to
100 mg a day.
• The early treatment of a heart
attack (myocardial infarction):
the recommended dose is 50 mg
to 100 mg a day.
If you are an elderly person, your
doctor may decide to give you a
lower dose, particularly if you have
problems with your kidneys.
People with severe kidney problems
If you have severe kidney problems
your doctor may decide to give you
a lower dose.

Use in Children
This medicine must not be given to
If you take more Tenormin than
you should
If you take more Tenormin than
prescribed by your doctor, talk to a
doctor or go to a hospital straight
away. Take the medicine pack with you
so that the tablets can be identified.
If you forget to take Tenormin
If you forget to take a dose, take it
as soon as you remember. However,
if it is almost time for the next dose,
skip the missed dose. Do not take
a double dose to make up for a
forgotten dose.
If you stop taking Tenormin
Do not stop taking Tenormin without
talking to your doctor. In some cases,
you may need to stop taking it
4. Possible side effects
Like all medicines, this medicine can
cause side effects, although not
everybody gets them.
Allergic reactions:
If you have an allergic reaction, see a
doctor straight away. The signs may
include raised lumps on your skin
(weals), or swelling of your face, lips,
mouth, tongue or throat.

5. How to store Tenormin
• Keep this medicine out of the sight
and reach of children.
• Do not use this medicine after the
expiry date which is stated on the
blister strip. The expiry date refers
to the last day of that month.
• Do not store above 25°C. Store
your tablets in the original package.
Keep the blister strip in the carton.
This will protect your medicine from
light and moisture.
• Do not throw away any medicines
via wastewater or household
waste. Ask your pharmacist how
to throw away medicines you no
longer use. These measures will
help protect the environment.
6. Contents of the pack and other
What Tenormin contains
The active substance is atenolol. Each
tablet contains 100 mg (milligrams)
of atenolol.
The other ingredients are gelatin,
heavy magnesium carbonate,
magnesium stearate, hypromellose,
sodium lauryl sulfate, maize starch,
titanium dioxide (E171), glycerol and
purified water.

What Tenormin looks like and
contents of the pack
Other possible side effects:
Tenormin 100 mg Tablets are white
Common (may affect up to 1 in
and round with 100 embossed on
10 people)
one side and bisected on the other
• You may notice that your pulse rate
side. They come in packs (blister strips)
becomes slower while you are
containing 28 tablets or 504 tablets.
taking the tablets. This is normal,
Marketing Authorisation Holder
but if you are concerned please
and Manufacturer
tell your doctor about it.
The Marketing Authorisation for
• Cold hands and feet.
• Diarrhoea.
Tenormin 100 mg Tablets is held
• Feeling sick (nausea).
by AstraZeneca UK Limited,
• Feeling tired.
600 Capability Green, Luton,
LU1 3LU, UK.
Uncommon (may affect up to 1 in
100 people)
Tenormin 100 mg Tablets
• Disturbed sleep.
are manufactured by
AstraZeneca UK Limited,
Rare (may affect up to 1 in
Silk Road Business Park,
1,000 people)
Macclesfield, Cheshire,
• Heart block (which can cause
dizziness, abnormal heart beat,
SK10 2NA, UK.
tiredness or fainting).
To listen to or request
• Numbness and spasm in your
fingers which is followed by warmth
a copy of this leaflet
and pain (Raynaud’s disease).
• Mood changes.
in Braille, large print or
• Nightmares.
audio please call, free of
• Feeling confused.
• Changes in personality (psychoses) charge:
or hallucinations.
0800 198 5000 (UK only)
• Headache.
• Dizziness (particularly when
Please be ready to give
standing up).
• Tingling of your hands.
the following information:
• Being unable to get an erection
Product name
• Dry mouth.
Tenormin 100 mg Tablets
• Dry eyes.
• Disturbances of vision.
Reference number
• Thinning of your hair.
• Skin rash.
• Reduced numbers of platelets in
This is a service provided
your blood (this may make you
bruise more easily).
by the Royal National
• Purplish marks on your skin.
Institute of Blind People.
• Jaundice (causing yellowing of your
This leaflet was revised in
skin or the whites of your eyes).
December 2016.
Very rare (may affect up to 1 in
© AstraZeneca 2016.
10,000 people)
Tenormin is a trade mark of the
• Changes to some of the cells or
AstraZeneca group of companies.
other parts of your blood. Your
doctor may take blood samples
every so often to check whether
Tenormin has had any effect on
your blood.

CV 16 0097

Not known (frequency cannot be
estimated from the available data)
• Lupus-like syndrome (a disease
where the immune system
produces antibodies that attacks
mainly skin and joints).
Conditions that may get worse
If you have any of the following
conditions, they may get worse when
you start to take your medicine. This
happens rarely affecting less than 1 in
1,000 people.
• Psoriasis (a skin condition).
• Being short of breath or having
swollen ankles (if you have heart
• Asthma or breathing problems.
• Poor circulation.
Reporting of side effects
If you get any side effects, talk to your
doctor or pharmacist. This includes any
possible side effects not listed in this
leaflet. You can also report side effects
directly via the Yellow Card Scheme.
By reporting side effects you can help
provide more information on the safety
of this medicine.

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