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Active substance(s): THALLIUM (201TL) CHLORIDE

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Package leaflet: information for the patient
Thallium (201Tl) chloride CIS bio international solution for injection
Reference: TL-201-S-1

Read all of this leaflet carefully before you are given 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 nuclear medicine doctor who will supervise the
If you get any side effects, talk to your nuclear medicine doctor. This includes any possible side
effects not listed in this leaflet. See section 4.

What is in this leaflet:
What Thallium (201Tl) chloride injection is and what it is used for
What you need to know before Thallium (201Tl) chloride injection is used
How Thallium (201Tl) chloride injection is used
Possible side effects
How Thallium (201Tl) chloride injection is stored
Contents of the pack and other information
1. What Thallium (201Tl) chloride is and what it is used for
This medicine is a radiopharmaceutical product for diagnostic use only.
When injected into a vein of your arm, thallium (201Tl) chloride, the radioactive element, temporarily
collects in a specific part of your body like heart, muscles, parathyroid glands, brain or thyroid.
Because of its radioactivity, it can be easily detected from outside your body using a special camera,
and pictures, known as scans, can be taken.These scans give valuable information on either the
structure of the organ or how efficiently processes associated with blood flow through the organ are
being carried out.
In particular, the thallium (201Tl) chloride can be used:

to examine the heart, the leg muscles and the parathyroid gland, or
to show up brain and thyroid tumours.

Your doctor / nuclear medicine specialist will explain to you what kind of examination will be
The use of Thallium (201Tl) chloride does involve exposure to amounts of radioactivity. Your doctor
and the nuclear medicine doctor have considered that the clinical benefit that you will obtain from the
procedure with the radiopharmaceutical outweighs the risk due to radiation.

What you need to know before thallium (201Tl) chloride is used


Thallium (201Tl) chloride must not be used:
• If you are allergic to thallium (201Tl) chloride or any of the other ingredients of this medicine
(listed in section 6).
• If you are pregnant or or believe you may be pregnantIf you are breast-feeding (
• If you are under 18 years old..
Warnings and precautions
Some examinations of heart behaviour involve exercising to make the heart work harder. Your doctor /
nuclear medicine doctor will only consider this type of test if she/he is certain that the exercise will not
be harmful to you.
Before administration of Thallium (201Tl) chloride you should:
- be fasting for at least 4 hours.

drink plenty of water before the start of the examination in order to urinate as often as
possible during the first hours after the study.

Children and adolescents
Talk to your nuclear medicine doctor if you are under 18 years old.
Other medicines and Thallium (201Tl) chloride injection
Tell your nuclear medicine doctor if you are taking, have recently taken or might take any other
medicines, including medicines obtained without a prescription since they may interfere with the
interpretation of the images. Particular examples are:
• Medicines used to treat heart conditions and high blood pressure (dipyridamole, adenosine,
isoprenaline, dobutamine, nitrates, beta-blockers, digitalis analogues,…)
• insulin (medicine used to treat Diabetes Mellitus),
• Medicines used to treat breathing difficulty (methylxanthines (i.e. theophyllin))
Pregnancy and breast-feeding

If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a
baby, ask your nuclear medicine doctor for advice before you are given this medicine.
You must inform the nuclear medicine doctor before the administration of Thallium (201Tl) chloride
if there is a possibility you might be pregnant, if you have missed your period or if you are breastfeeding.
When in doubt, it is important to consult your nuclear medicine doctor who will supervise the
If you are pregnant
You must not be given Thallium (201Tl) chloride if you are pregnant. It must be established that
you are not pregnant before the use of this product.
So you must tell your doctor/ nuclear medicine specialist if you have missed a period or if there is
any chance you may be pregnant.Investigations in nuclear medicine may involve a risk to the unborn.
If you are breast-feeding
Tell your nuclear medicine doctorif you are breast-feeding, as you should completely stop this
before treatment.
Moreover you may need to avoid close contact with your baby for a while depending on the dose
administered. Your nuclear medicine doctor will inform you.
Please ask your nuclear medicine doctor when you can resume breast-feeding.

Driving and using machines
It is considered unlikely that Thallium (201Tl) chloride will affect your ability to drive or to use
Thallium (201Tl) chloride contains less than 1 mmol of sodium (23 mg) per vial, i.e. essentially
‘sodium- free’


How thallium (201Tl) chloride is used

There are strict laws on the use, handling and disposal of radiopharmaceutical products. Thallium
(201Tl) chloride will only be used in special controlled areas. This product will only be handled and
given to you by people who are trained and qualified to use it safely. These persons will take special
care for the safe use of this product and will keep you informed of their actions.
The nuclear medicine doctor supervising the procedure will decide on the quantity of Thallium (201Tl)
chloride to be used in your case. It will be the smallest quantity necessary to get the desired
The quantity to be administered usually recommended is about 1 MBq per kg (MBq: megabecquerel,
the unit used to express radioactivity).
Administration of Thallium (201Tl) chloride and conduct of the procedure
Thallium (201Tl) chloride i will be injected into a vein of your arm.
Usually one injection is sufficient to provide your doctor with the information needed although
sometimes a second injection may be required.
The injection may be given either at rest or during the course of a stress test in which either
exercise or the administration of another medicinal product is used to make your heart work harder.
Scans may be taken at any time from the beginning of the injection, depending on which images are
required. Additional scans, possibly involving a second injection may be performed between 3 and 24
hours after the first injection.
Duration of the procedure
Your nuclear medicine doctor will inform you about the usual duration of the procedure.
After administration of Thallium (201Tl) chloride , you should urinate frequently in order to

eliminate the product from your body.
The nuclear medicine doctor will inform you if you need to take any special precautions after
receiving this medicine. Contact your nuclear medicine doctor if you have any questions.
If you have been given more Thallium (201Tl) chloride than you should
An overdose is unlikely, since Thallium (201Tl) chloride is administered by a doctor under strictly
controlled conditions. However, in the case of an overdose, you will receive the appropriate treatment.
You will be asked to drink plenty of water and to take laxatives to increase the elimination of the
product from your body.
Should you have any further question on the use of Thallium (201Tl) chloride , please ask the nuclear
medicine doctor who supervises the procedure.


Possible side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them.
Possible side effects
Rare (frequency lower than one out of 1,000 patients and higher than one out of 10,000 patients)
• Allergy (rash, itching)
• Fainting (Vasovagal syncope).
Frequency not known:
• Local skin damage (necrosis) has been reported when the injection was not in the vein.
• Any radioactive material may cause cancer or hereditary defects, but the frequency of these
adverse reactions is not known.
Reporting of side effects
If you get any side effects, talk to your nuclear medicine doctor. 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.


How thallium (201Tl) chloride is stored

You will not have to store this medicine. This medicine is stored under the responsibility of the
specialist in appropriate premises. Storage of radiopharmaceuticals will be in accordance with national
regulation on radioactive materials.


Contents of the pack and other further information

What Thallium (201Tl) chloride injection contains
• The active substance is Thallium (201Tl) chloride.
• The other ingredients are sodium chloride, nitric acid and water for injections.
What Thallium (201Tl) chloride injection looks like and contents of the pack
You will not have to get or to manipulate this medicine, what follows is only for your information
Thallium (201Tl) chloride i is a sterile, clear and colourless solution for injection.
Packsize: A multidose vial can contain from 1 to 10 ml of solution for injection, corresponding to
37 up to 370 MBq per vial at calibration date.

Marketing Authorisation Holder and Manufacturer
CIS bio international
B.P. 32
91192 Gif-sur-Yvette Cedex

This leaflet was last revised in 11/2013

Detailed information on this medicine is available on the web site of the MHRA.

The following information is intended for medical or healthcare professionals only:
The complete SmPC of Thallium (201Tl) chloride is provided as a separate document in the product
package, with the objective to provide healthcare professionals with other additional scientific and
practical information about the administration and use of this radiopharmaceutical.
Please refer to the SmPC.

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