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Levothyroxine sodium 25 micrograms Tablets
(levothyroxine sodium)

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, pharmacist or
-- 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, pharmacist or
nurse. This includes any possible side effects not listed in this
leaflet. See section 4.
The name of your medicine is Levothryoxine sodium 25 micrograms
tablets. It will be referred to as Levothryoxine Tablets for ease
throughout the leaflet.
What is in this leaflet:
1. What Levothyroxine Tablets are and what they are used for
2. What you need to know before you take Levothyroxine
3. How to take Levothyroxine Tablets
4. Possible side effects
5. How to store Levothyroxine Tablets
6. Contents of the pack and other information


Thyroxine is a hormone which is produced naturally in the body by the
thyroid gland. Levothyroxine is a synthetic version of this hormone.
Thyroxine controls how much energy your body uses. When the
thyroid gland does not produce enough thyroxine (a condition known
as hypothyroidism), many of the body’s functions slow down. Some of
the most common symptoms of hypothyroidism are:
• tiredness
• weight gain
• feeling depressed
Levothyroxine tablets are used to replace the thyroxine that your
thyroid gland cannot produce and prevent the symptoms of
hypothyroidism. Before starting your treatment your doctor will carry
out a blood test to work out how much levothyroxine you need.

Do not take this medicine if you:
• are allergic to levothryoxine or to any of the other ingredients
(see section 6)
• suffer from an overactive thyroid gland that produces too much
thyroid hormone (thyrotoxicosis)
• have any condition that affects your adrenal glands (your doctor
will be able to advise you if you are not sure).
If any of these apply to you, do not take this medicine and go back to
your doctor to discuss your treatment.
Warnings and precautions
Talk to your doctor or pharmacist before taking these tablets
if you:
• have suffered with an under active thyroid gland for a long time
• suffer from heart problems including angina, coronary artery
disease or high blood pressure
• are being treated for diabetes. The dose of your anti-diabetic
medicine may need to be changed as levothyroxine can raise blood
sugar levels
• are over 50 years of age.
Blood tests:
Before you start taking levothyroxine your doctor will do a blood test to
see how much thyroxine your thyroid gland is making and what dose
of the medicine you will need. Once you start taking the medicine your
doctor will want you to have regular blood tests to see how well the
medicine is working.
Other medicines and Levothyroxine Tablets:
Tell your doctor or pharmacist if you are taking, have recently
taken or might take any other medicines. This includes over the
counter medicines, herbal remedies and vitamin supplements. Many
medicines affect the way levothyroxine works.

The effects of other drugs may also be affected by levothyroxine.
The following may affect the way that levothyroxine works:
• medicines for epilepsy such as carbamazepine, phenytoin,
primidone and barbiturates
• sertraline- used to treat depression and anxiety disorders
• antacids- used to treat indigestion
• medicines containing calcium salts
• cimetidine- used to reduce excess stomach acid
• proton pump inhibitors such as omeprazole, lansoprazole and
pantoprazole- used to reduce the amount of acid produced by the
• sucralfate- used to treat and prevent stomach and duodenal
• cholestyramine and colestipol- used to treat high level of fat in
the blood
• polystyrene sulphone resin- used to reduce high levels of
potassium in the blood
• medicines containing iron that are taken by mouth
• rifampicin- used to treat infections
• imatinib- used to treat certain types of cancer
• beta blockers such as atenolol and sotalol- used to treat high
blood pressure and heart problems
• oestrogen containing medicines for hormone replacement
therapy (HRT) and contraception (the ‘pill’)
• androgen containing medicines for male hormone replacement
• corticosteroids such as hydrocortisone and prednisoloneused to treat inflammation
• amiodarone- used to treat an irregular heart beat
• orlistat- used to treat obesity.
The following may be affected by levothyroxine:
• anticoagulant medicines to prevent blood clots such as
• medicines to treat diabetes such as insulin and metformin
• tricyclic antidepressants such as amitriptyline, imipramine
and dosulepin
• medicines that stimulate the sympathetic nervous system such
as adrenaline (used to treat severe allergic reactions) or
phenylephrine (a decongestant found in many cold and flu
• digoxin- used to treat heart problems
• anti-inflammatory medicines such as phenylbutazone or aspirin
• propranolol- used to treat high blood pressure and heart
• ketamine- used as an anaesthetic. If you need to have an
operation, please tell your doctor or anaesthetist that you are
taking levothyroxine.
Pregnancy and breastfeeding:
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. Your doctor will decide if you
should continue treatment with levothyroxine whilst you are pregnant,
particularly in the first three months of your pregnancy.
Driving and using machines
This medicine should not affect your ability to drive and use machines.
Levothyroxine Tablets contain lactose:
This medicine also contains lactose, a sugar. If you have been told by
your doctor that you have an intolerance to some sugars, contact your
doctor before taking this medicine.

Always take levothyroxine tablets exactly as your doctor or pharmacist
has told you. Check with your doctor or pharmacist if you are not sure.
You may be taking this medicine for the rest of your life.
Your dose will be decided by your doctor and will depend on the
results of your blood tests. The dose you should take will be on the
label attached by your pharmacist. Swallow the tablets with plenty of
water. You should usually take your tablets before breakfast or your
first meal of the day.

The recommended starting dose is 50 - 100 micrograms every day.
Your doctor may increase the dose you take every 3 - 4 weeks by 50
micrograms until your thyroxine levels are correct. Your final daily dose
may be up to 100 - 200 micrograms daily.
Patients over 50 years of age:
The recommended starting dose will be no more than 50 micrograms
every day. The dose may then be increased by 50 micrograms every
3 - 4 weeks until your thyroxine levels are correct. Your final daily dose
will be between 50 - 200 micrograms daily.
Patients over 50 years of age with heart problems:
The recommended starting dose will be 25 micrograms every day or
50 micrograms every other day. The dose may be increased by 25
micrograms every 4 weeks until your thyroxine levels are correct. Your
final daily dose will usually be between 50 - 200 micrograms daily.
Use in children:
For young children, your doctor is likely to prescribe Levothyroxine Oral
Solution instead of tablets.
Congenital hypothyroidism in infants:

This is a condition where your baby has been born with a thyroid gland
that does not produce enough thyroxine. The starting dose is 10 - 15
micrograms/ kg bodyweight per day for the first three months. The
dose will then be adjusted depending on how your baby responds to
the treatment.
Acquired hypothyroidism in children:

This is a condition where your child’s thyroid gland stops working
properly because it has been attacked by their immune system, e.g. in
children with an autoimmune disease or following a viral infection. The
starting dose is 12.5 - 50 micrograms per day. The dose will then be
increased every 2 - 4 weeks depending on how your child responds to
the medicine.
Juvenile myxoedema:

This is a condition where children and adolescents develop severe
hypothyroidism (produce very low levels of thyroid hormones). The

starting dose is 25 micrograms every day. The dose will then be
increased by 25 micrograms every 2 - 4 weeks until your child shows
mild symptoms of hyperthyroidism (a condition where the thyroid
gland produces too much thyroxine). The dose will then be reduced
If you take more Levothyroxine than you should:
If you (or someone else) swallow a lot of the tablets at the same time,
or you think a child may have swallowed some, contact your nearest
hospital casualty department or tell your doctor immediately. Signs of
an overdose may include: fever, chest pain (angina), racing or irregular
heartbeat, muscle cramps, headache, restlessness, flushing, sweating
and diarrhoea. These signs can take up to 5 days to appear. Take any
remaining tablets and this leaflet with you so that the medical staff
knows exactly what you have taken.

very high temperature; fast heart rate; irregular hearbeat; low
blood pressure; heart failure; jaundice; confusion; fits and coma.

Tell your doctor or pharmacist if any of the following side
effects continue, get worse or if you notice any other side
effects not listed.
Most of the side effects are similar to the symptoms of hyperthyroidism
(where the thyroid gland makes too much thyroxine) and are due to
your dose of the medicine being too high. They will usually disappear
after reducing the dose or stopping the tablets. However, you must
not change the dose or stop the tablets without talking to
your doctor first.
Not known (frequency cannot be estimated from the available
• headache
• flushing
• high temperature, sweating
• weight loss
• tremor, restlessness, excitability, difficulty sleeping (insomnia)
• increased pressure around the brain in children that is not caused
by a tumour or other diseases (benign intracranial hypertension)
• chest pain (angina), pounding, irregular or fast heartbeat
• diarrhoea, vomiting
• muscle cramps, muscle weakness
• deformity of the skull in infants caused by the early closure of
joints in the skull bone (craniostenosis)
• growth in children may slow or stop due to changes in bone
• irregular periods
• intolerance to heat
• temporary hair loss in children.
Reporting of side effects:
If you get any side effects, talk to your doctor, pharmacist or nurse.
This includes any possible side effects not listed in this leaflet. You can
also report side effects directly via the Yellow Card Scheme at
By reporting side effects you can help provide more information on the
safety of this medicine.

Keep out of the sight and reach of children.
Do not use Levothyroxine tablets after the expiry date which is stated
on the box. The expiry date refers to the last day of that month.
Do not store above 25oC. Store in the original package in order to
protect from light and moisture.
Medicines should not be disposed of via wastewater or household
waste. Ask your pharmacist how to dispose of medicines no longer
required. These measures will help protect the environment.


If you forget to take Levothyroxine:
If you forget to take a dose take it as soon as you remember unless it
is nearly time for your next dose. Do not take a double dose to make
up for a forgotten dose. If you forget to give your child their dose,
contact your doctor or pharmacist for further advice.

What Levothyroxine Tablets contain:
-The active substance is anhydrous levothyroxine sodium.
Each tablet contains 25 micrograms of anhydrous levothyroxine
-The other ingredients are sodium citrate, lactose monohydrate,
maize starch, acacia powder and magnesium stearate.

If you stop taking Levothyroxine tablets:
These tablets are for long term use. You may need to take them for
the rest of your life. Do not stop taking the tablets unless your doctor
has told you to do so.

What Levothyroxine Tablets look like and contents of the
White, round tablets, scored on one side and engraved on the other
with ‘FW41’. They are packed in blister packs of 28.

If you have any further questions on the use of this medicine, ask your
doctor, pharmacist or nurse.

Custom Pharmaceuticals Ltd., Tecore House, Conway Street, Hove,
East Sussex, BN3 3LW, UK

Like all medicines, this medicine can cause side effects, although not
everbody gets them.
Stop taking the tablets and go to hospital at once if you have:
• A rare allergic reaction such as swelling of the face, tongue, lips
and throat, difficulty breathing, severe itching of your skin with
raised lumps, joint pain, sensitivity to the sun, general feeling of
being unwell. You may need urgent medical attention.
Some patients may experience a severe reaction to high levels
of thyroid hormone. This is called a “thyroid crisis” and you
should contact your doctor immediately if you have any of the
following symptoms:

Procured from within the EU and repackaged by the Product Licence
Holder: Summer Healthcare Ltd., 4 Petre Road, Clayton Business Park,
Clayton-Le-Moors, Accrington BB5 5JB, UK.
PL: 33948/0045
Date of Leaflet: 24th April 2017

Blind or partially sighted? Is this
leaflet hard to see or read? Call
01254 315040 to obtain a leaflet in
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