Teoptic eye drops contain the active ingredient carteolol, which is a type of medicine called a beta-blocker. It works by blocking beta-receptors in the eye.
The pressure within the eyeball is naturally maintained by a continuous flow of liquid called aqueous humour through the eyeball. Aqueous humour is produced by a part of the eye called the ciliary body, and it drains out of the eyeball through channels called the trabecular meshwork. If the outflow of aqueous humour is blocked, the aqueous humour builds up inside the eye, increasing the pressure within the eyeball. This pressure needs to be reduced, as otherwise it can damage the optic nerve and impair vision as a result.
Carteolol blocks beta-receptors that are found on the ciliary body. This reduces the amount of aqueous humour secreted into the eyeball by the ciliary body. Carteolol also blocks beta-receptors found on the blood vessels that supply the ciliary body. This causes these blood vessels to constrict, and reduces the amount of watery fluid that filters out of the blood vessels to form aqueous humour.
Carteolol therefore reduces the inflow of aqueous humour into the eyeball, which decreases the pressure within the eye. It is used to treat conditions where there is raised pressure in the eye, such as glaucoma.
Sufficient carteolol may be absorbed from the eye into the bloodstream to cause side effects on other parts of the body, or to react with other medicines being taken by mouth, injection or suppository. You can minimise the amount of medicine that is absorbed into your bloodstream and increase the local action in the eye by pressing on your tear duct (the corner of the eye closest to the nose), or closing your eyelids after putting in the drops. It is recommended that you do this for five minutes after you have administered the drops.
This medicine should not be used if you are allergic to one or any of its ingredients. Please inform your doctor or pharmacist if you have previously experienced such an allergy.If you feel you have experienced an allergic reaction, stop using this medicine and inform your doctor or pharmacist immediately.
Certain medicines should not be used during pregnancy or breastfeeding. However, other medicines may be safely used in pregnancy or breastfeeding providing the benefits to the mother outweigh the risks to the unborn baby. Always inform your doctor if you are pregnant or planning a pregnancy, before using any medicine.
Medicines and their possible side effects can affect individual people in different ways. The following are some of the side effects that are known to be associated with this medicine. Just because a side effect is stated here does not mean that all people using this medicine will experience that or any side effect.
The side effects listed above may not include all of the side effects reported by the medicine's manufacturer.For more information about any other possible risks associated with this medicine, please read the information provided with the medicine or consult your doctor or pharmacist.
The carteolol in these eye drops can be absorbed into the bloodstream after application to the eye and it may therefore interact with other medicines that you are taking. It is important to tell your doctor or pharmacist what medicines you are already taking, including those bought without a prescription and herbal medicines, before you start treatment with this medicine. Similarly, check with your doctor or pharmacist before taking any new medicines while using this one, to ensure that the combination is safe.
If you are using more than one type of eye drop you should administer them at least five minutes apart, to prevent the second drop washing away the first. Use eye gels or ointments last.
If you are already taking any beta-blocker medicines by mouth, for example propranolol, atenolol, metoprolol, these eye drops may increase the chance of experiencing side effects from the oral beta-blocker.
If this medicine is used by people taking calcium channel blockers, such as nifedipine, verapamil or diltiazem, there may be an increased risk of slow heart rate, low blood pressure or heart failure.
If this medicine is used by people taking digoxin or medicines for an abnormal heart rhythm (antiarrhythmics such as amiodarone, quinidine or disopyramide) there may be an increased risk of slow heart rate.
If you go into hospital or to the dentist to have an operation you should tell the person treating you that you are using these eye drops. This is because your blood pressure may fall too low if you are given certain types of anaesthetics while using this medicine.
This medicine may reduce the blood sugar lowering effect of some medicines used to treat diabetes. People with diabetes should carefully monitor their blood sugar while using this medicine, as the eye drops may also mask some of the signs of low blood sugar, such as increased heart rate and tremor.
There are currently no other medicines available in the UK that contain carteolol as the active ingredient.