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COSOPT® 20 mg/ml + 5 mg/ml eye drops, solution

For Position Only

Package leaflet: information for the user
(dorzolamide / timolol)
Read all of this leaflet carefully before you start using 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 side effects not listed in this
leaflet. See section 4.
What is in this leaflet
1. What COSOPT is and what it is used for
2. What you need to know before you use COSOPT
3. How to use COSOPT
4. Possible side effects
5. How to store COSOPT
6. Contents of the pack and other information
1. What COSOPT is and what it is used for
COSOPT contains two medicines: dorzolamide and timolol.
• Dorzolamide belongs to a group of medicines called “carbonic anhydrase inhibitors”.
• Timolol belongs to a group of medicines called “beta blockers”.
These medicines lower the pressure in the eye in different ways.
COSOPT is prescribed to lower raised pressure in the eye in the treatment of glaucoma when beta-blocker eyedrop
medicine used alone is not adequate.
2. What you need to know before you use COSOPT
Do not use COSOPT
• if you are allergic to dorzolamide hydrochloride, timolol maleate or any of the other ingredients of this medicine
(listed in section 6).
• if you have now or had in the past respiratory problems, such as asthma or severe chronic obstructive bronchitis
(severe lung disease which may cause wheeziness, difficulty in breathing and/or long-standing cough).
• if you have a slow heart beat, heart failure or disorders of heart rhythm (irregular heart beats).
• if you have severe kidney disease or problems, or a prior history of kidney stones.
• if you have excess acidity of the blood caused by a build up of chloride in the blood (hyperchloraemic acidosis).
If you are not sure whether you should use this medicine, contact your doctor or pharmacist.
Warnings and precautions
Talk to your doctor before using COSOPT.
Tell your doctor about any medical or eye problems you have now or have had in the past:
• coronary heart disease (symptoms can include chest pain or tightness, breathlessness, or choking), heart
failure, low blood pressure.
• disturbances of heart rate such as slow heart beat.
• breathing problems, asthma or chronic obstructive pulmonary disease.
• poor blood circulation disease (such as Raynaud’s disease or Raynaud’s syndrome).
• diabetes as timolol may mask signs and symptoms of low blood sugar.
• overactivity of the thyroid gland as timolol may mask signs and symptoms.
Tell your doctor before you have an operation that you are using COSOPT as timolol may change effects of some
medicines used during anaesthesia.
Also tell your doctor about any allergies or allergic reactions including hives, swelling of the face, lips, tongue,
and/or throat which may cause difficulty in breathing or swallowing.
Tell your doctor if you have muscle weakness or have been diagnosed as having myasthenia gravis.
If you develop any eye irritation or any new eye problems such as redness of the eye or swelling of the eyelids,
contact your doctor immediately.
If you suspect that COSOPT is causing an allergic reaction or hypersensitivity (for example, skin rash, severe skin
reaction, or redness and itching of the eye), stop using this medicine and contact your doctor immediately.
Tell your doctor if you develop an eye infection, receive an eye injury, have eye surgery, or develop a reaction
including new or worsening symptoms.
When COSOPT is instilled into the eye it may affect the entire body.
If you wear soft contact lenses, you should consult your doctor before using this medicine.
Use in children
There is limited experience with COSOPT in infants and children.
Use in elderly
In studies with COSOPT, the effects of this medicine were similar in both elderly and younger patients.
Use in patients with liver impairment
Tell your doctor about any liver problems you now have or have suffered from in the past.
Other medicines and COSOPT
COSOPT can affect or be affected by other medicines you are using, including other eye drops for the treatment
of glaucoma. Tell your doctor if you are using or intend to use medicines to lower blood pressure, heart medicine
or medicines to treat diabetes. Tell your doctor or pharmacist if you are using, have recently used or might use any
other medicines. This is particularly important if you are:
• taking medicine to lower blood pressure or to treat heart disease (such as calcium channel blockers, beta-blockers
or digoxin).
• taking medicines to treat a disturbed or irregular heartbeat such as calcium channel blockers, beta-blockers or
• using another eyedrop that contains a beta-blocker.
• taking another carbonic anhydrase inhibitor such as acetazolamide.
• taking monoamine oxidase inhibitors (MAOIs) which are used to treat depression.
• taking a parasympathomimetic medicine which may have been prescribed to help you pass urine.
Parasympathomimetics are also a particular type of medicine which is sometimes used to help restore normal
movements through the bowel.
• taking narcotics such as morphine used to treat moderate to severe pain.
• taking medicines to treat diabetes.
• taking antidepressants known as fluoxetine and paroxetine.
• taking a sulfa medicine.
• taking quinidine (used to treat heart conditions and some types of malaria).

Pregnancy and breast-feeding
Ask your doctor or pharmacist for advice before taking any medicine.
Use in pregnancy
Do not use COSOPT if you are pregnant unless your doctor considers it necessary
Use in breast-feeding
Do not use COSOPT if you are breast-feeding. Timolol may get into your milk. Ask your doctor for advice before
taking any medicine during breast-feeding.
Driving and using machines
No studies on the effects on the ability to drive or use machines have been performed. There are side effects
associated with COSOPT, such as blurred vision, which may affect your ability to drive and/or operate machinery.
Do not drive or operate machinery until you feel well or your vision is clear.
COSOPT contains benzalkonium chloride
If you wear soft contact lenses, you should consult your doctor before using COSOPT (the preservative benzalkonium
chloride may possibly discolour the lenses).
3. How to use COSOPT
Always use this medicine exactly as your doctor has told you. Check with your doctor or pharmacist if you are not
sure. The appropriate dosage and duration of treatment will be established by your doctor.
The recommended dose is one drop in the affected eye(s) in the morning and in the evening.
If you are using this medicine with another eye drop, the drops should be instilled at least 10 minutes apart.
Do not change the dose of the medicine without consulting your doctor.
Do not allow the tip of the container to touch the eye or areas around the eye. It may become contaminated with
bacteria that can cause eye infections leading to serious damage of the eye, even loss of vision. To avoid possible
contamination of the container, wash your hands before using this medicine and keep the tip of the container
away from contact with any surface. If you think your medication may be contaminated, or if you develop an eye
infection, contact your doctor immediately concerning continued use of this bottle.
Instructions for use
1. Before using the medication for the first time, be sure the Safety Strip on the front of the bottle is unbroken.
A gap between the bottle and the cap is normal for an unopened bottle.
Opening Arrows
Safety Strip

2. First wash your hands, then tear off the Safety Strip to break the seal.

Finger Push Area

3. To open the bottle, unscrew the cap by turning as indicated by the arrows on the top of the cap. Do not pull
the cap directly up and away from the bottle. Pulling the cap directly up will prevent your dispenser from
operating properly.

Finger Push Area

4. Tilt your head back and pull your lower eyelid down slightly to form a pocket between your eyelid and your eye.

5. Invert the bottle, and press lightly with the thumb or index finger over the “Finger Push Area” (as shown) until a
single drop is dispensed into the eye as directed by your doctor.
Finger Push Area


6. After using COSOPT press a finger into the corner of your eye, by the nose, or close your eyelids for 2 minutes.
This helps to stop the medicine from getting into the rest of the body.

7. If drop dispensing is difficult after opening for the first time, replace the cap on the bottle and tighten (Do not
overtighten) and then remove by turning the cap in the opposite directions as indicated by the arrows on the
top of the cap.
8. Repeat steps 4 & 5 with the other eye if instructed to do so by your doctor.
9. Replace the cap by turning until it is firmly touching the bottle. The arrow on the left side of the cap must be
aligned with the arrow on the left side of the bottle label for proper closure. Do not overtighten or you may
damage the bottle and cap.
10. The dispenser tip is designed to provide a single drop; therefore, do NOT enlarge the hole of the dispenser tip.
11. After you have used all doses, there will be some COSOPT left in the bottle. You should not be concerned since
an extra amount of this medicine has been added and you will get the full amount of COSOPT that your doctor
prescribed. Do not attempt to remove the excess medicine from the bottle.
If you use more COSOPT than you should
If you put too many drops in your eye or swallow any of the contents of the container, among other effects, you
may become light-headed, have difficulty breathing, or feel that your heart rate has slowed. Contact your doctor
If you forget to use COSOPT
It is important to use this medicine as prescribed by your doctor.
If you miss a dose, use it as soon as possible. However, if it is almost time for the next dose, skip the missed dose
and go back to your regular dosing schedule.
Do not use a double dose to make up for the forgotten dose.
If you stop using COSOPT
If you want to stop using this medicine talk to your doctor first.
If you have any further questions on the use of this product, ask your doctor or pharmacist.
4. Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them.
You can usually carry on taking the drops, unless the effects are serious. If you’re worried, talk to a doctor or pharmacist.
Do not stop using COSOPT without speaking to your doctor.
Generalised allergic reactions including swelling beneath the skin that can occur in areas such as the face and
limbs, and can obstruct the airway which may cause difficulty swallowing or breathing, hives or itchy rash,
localised and generalised rash, itchiness, severe sudden life-threatening allergic reaction.
The frequency of possible side effects listed below is defined using the following convention:
Very common (affects more than 1 user in 10)
Common (affects 1 to 10 users in 100)
Uncommon (affects 1 to 10 users in 1,000)
Rare (affects 1 to 10 users in 10,000)
Not known (frequency cannot be estimated from the available data)
The following side effects have been reported with COSOPT or one of its components either during clinical trials or
during post-marketing experience:
Very Common:
Burning and stinging of the eyes, unusual taste.
Redness in and around the eye(s), watering or itching of the eye(s), corneal erosion (damage to the front layer of
the eyeball), swelling and/or irritation in and around the eye(s), feeling of having something in the eye, decreased
corneal sensitivity (not realising of getting something in the eye and not feeling pain), eye pain, dry eyes, blurred
vision, headache, sinusitis (feeling of tension or fullness in the nose), feeling sick, also called nausea, weakness/
tiredness, and fatigue.
Dizziness, depression, inflammation of the iris, visual disturbances including refractive changes (in some cases
due to withdrawal of medication to treat excessive contraction of the pupil of the eye), slow heartbeat, fainting,
difficulty breathing (dyspnoea), indigestion, and kidney stones (often marked by a sudden onset of excruciating,
cramping pain in their low back and/or side, groin, or abdomen).
Systemic lupus erythematosus (an immune disease which may cause an inflammation of internal organs), tingling
or numbness of the hands or feet, trouble sleeping, nightmares, memory loss, an increase in signs and symptoms
of myasthenia gravis (muscle disorder), decreased sex drive, stroke, temporary short sightedness which may
resolve when treatment is stopped, detachment of the layer below the retina that contains blood vessels following
from filtration surgery which may cause visual disturbances, drooping of the eyelids (making the eye stay half
closed), double vision, eyelid crusting, swelling of the cornea (with symptoms of visual disturbances), low pressure
in the eye, ringing noises in your ear, low blood pressure, changes in the rhythm or speed of the heartbeat,
congestive heart failure (heart disease with shortness of breath and swelling of feet and legs due to fluid build up),
oedema (fluid build up), cerebral ischaemia (reduced blood supply to the brain), chest pain, palpitations (a quicker
and/or irregular heartbeat), heart attack, Raynaud’s phenomenon, swelling or coldness of your hands and feet and
reduced circulation in your arms and legs, leg cramps and/or leg pain when walking (claudication), shortness of
breath, feeling out of breath, runny or stuffed nose, nose bleed, constriction of the airways in the lungs causing
difficulty in breathing, cough, throat irritation, dry mouth, diarrhoea, contact dermatitis, hair loss, skin rash with
white silvery coloured appearance (psoriasiform rash), Peyronie’s disease (which may cause a curvature of the
penis), allergic type reactions such as rash, hives, itching, in rare cases possible swelling of the lips, eyes and
mouth, wheezing, or severe skin reactions (Stevens Johnson syndrome, toxic epidermal necrolysis).
Like other medicines applied into your eyes, timolol is absorbed into the blood. This may cause similar side effects
as seen with oral beta-blocking agents. Incidence of side effects after topical ophthalmic administration is lower
than when medicines are, for example, taken by mouth or injected. Listed additional side effects include reactions
seen within the class of beta-blockers when used for treating eye conditions.

Not known:
Low blood glucose levels, heart failure, a type of heart rhythm disorder, abdominal pain, vomiting, muscle pain not
caused by exercise, sexual dysfunction.
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 (see details below). By reporting side effects you can help
provide more information on the safety of this medicine.
United Kingdom: Yellow Card Scheme Website:
Ireland: IMB Pharmacovigilence, Earlsfort Terrace, IRL - Dublin 2, Tel: +353 1 6764971, Fax: +353 1 6762517,
Website:, e-mail:
Malta: ADR Reporting, The Medicines Authority, Post-Licensing Directorate, 203 Level 3, Rue D’Argens,
GŻR-1368 Gżira Website:, e-mail:
5. How to store COSOPT
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date shown by the six digits following EX (or EXP) on the container.
The first two digits indicate the month; the last four digits indicate the year. The expiry date refers to the last day
of that month.
This medicinal product does not require any special temperature storage conditions. Keep the bottle in the outer
carton in order to protect from light.
You can use COSOPT for 28 days after first opening the container.
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 information
What COSOPT contains
• The active substances are dorzolamide and timolol.
• Each ml contains 20 mg of dorzolamide (as 22.26 mg dorzolamide hydrochloride) and 5 mg of timolol
(as 6.83 mg timolol maleate).
• The other ingredients are hydroxyethyl cellulose, mannitol, sodium citrate, sodium hydroxide, and water for
injections. Benzalkonium chloride is added as a preservative.
What COSOPT looks like and contents of the pack
COSOPT is a clear, colourless to nearly colourless slightly viscous solution. The OCUMETER Plus Ophthalmic
Dispenser consists of a translucent, high-density polyethylene container containing 5 ml of solution. Tamper
evidence is provided by a safety strip on the container label.
Pack sizes:
1 x 5 ml (single 5-ml containers)
3 x 5 ml (three 5-ml containers)
6 x 5 ml (six 5-ml containers)
Not all pack sizes may be marketed.
Marketing Authorisation Holder and Manufacturer
Marketing Authorisation Holder in UK and Malta: Merck Sharp & Dohme Limited,
Hertford Road, Hoddesdon, Hertfordshire EN11 9BU, UK.
Marketing Authorisation Holder in Ireland: Merck Sharp & Dohme Ireland (Human Health) Limited, Red Oak
North, South County Business Park, Leopardstown, Dublin 18, Ireland.
Manufacturer: Merck Manufacturing Division, Laboratoires Merck Sharp & Dohme-Chibret, Mirabel Plant,
Route de Marsat, Riom 63963 Clermont Ferrand Cedex 9, France.
This medicinal product is authorised in the Member States of the EEA under the following names:
Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxemburg, Netherlands, Portugal,
Spain, Sweden, UK:
This leaflet was last revised in March 2014.
This leaflet gives you the most important information about COSOPT. If you have any questions after you have
read it, ask your doctor or pharmacist, who can give you more information about COSOPT and your eye condition.
Further information about glaucoma is available from:
International Glaucoma Association (IGA)
Woodcote House
15 Highpoint Business Village
Kent, TN24 8DH
Tel: 01233 648170
Registered Charity number 274681.
Alternatively, if you or someone you know has problems with their vision, and you require further advice or
information, please phone the Royal National Institute for the Blind (RNIB) Helpline on 0303 123 9999, Monday to
Friday 8.45am to 5.30pm, calls charged at local rate.
(The IGA and RNIB are independent UK charities and are not associated with Merck Sharp & Dohme Limited.)
© Merck Sharp & Dohme Limited 2014. All rights reserved.

Merck Sharp & Dohme Limited,
Hertford Road, Hoddesdon, Hertfordshire EN11 9BU, UK
PIL.CST.13.UK-IRL.4010 (IB 065)


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