Dorzolamide and Timolol (Ophthalmic)
Brand Names : Cosopt
Before Using This MedicineIn deciding to use a medicine,
the risks of using the medicine must be weighed against the good it will do.
This is a decision you and your doctor will make. For ophthalmic dorzolamide
and timolol, the following should be considered:
Allergies - Tell your doctor if you have ever had any unusual or
allergic reaction to carbonic anhydrase inhibitors (either ophthalmic or systemic),
such as acetazolamide, brinzolamide, dichlorphenamide, dorzolamide, or methazolamide. In addition, tell your doctor if you have ever had any unusual or allergic
reaction to any of the beta-adrenergic blocking agents (either ophthalmic
or systemic), such as acebutolol, atenolol, betaxolol, bisoprolol, carteolol,
labetalol, levobunolol, metipranolol, metoprolol, nadolol, oxprenolol, penbutolol,
pindolol, propranolol, sotalol, or timolol.
Also, tell your doctor if you have ever had any unusual or allergic reaction
to sulfonamides (sulfa drugs) or thiazide diuretics (a type of water pill).
Furthermore, tell your health care professional if you are allergic to
any other substances, such as benzalkonium chloride or other preservatives.
Pregnancy - This medicine has not been studied in pregnant women.
However, studies in animals given very high doses of this medicine by mouth
have shown that this medicine causes birth defects or other problems. Before
using this medicine, make sure your doctor knows if you are pregnant or if
you may become pregnant.
Breast-feeding - Although it is not known whether dorzolamide passes
into the breast milk, timolol has been found to pass into the breast milk
and it is possible that it could cause unwanted effects in nursing babies.
Mothers who are using this medicine and who wish to breast-feed should discuss
this with their doctor.
Children - Studies on this medicine have been done only in adult
patients, and there is no specific information comparing use of this medicine
in children with use in other age groups.
Older adults - Many medicines have not been studied specifically
in older people. Therefore, it may not be known whether they work exactly
the same way they do in younger adults or if they cause different side effects
or problems in older people. There is no specific information comparing use
of this medicine in the elderly with use in other age groups.
Other medicines - Although certain medicines should not be used
together at all, in other cases two different medicines may be used together
even if an interaction might occur. In these cases, your doctor may want to
change the dose, or other precautions may be necessary. When you are using
this medicine, it is especially important that your health care professional
know if you are taking any of the following:
-
Beta-adrenergic blocking agents you take by mouth (acebutolol [e.g.,
Sectral], atenolol [e.g., Tenormin], betaxolol [e.g., Kerlone], bisoprolol
[e.g., Zebeta], carteolol [e.g., Cartrol], labetalol [e.g., Normodyne], metoprolol
[e.g., Lopressor], nadolol [e.g., Corgard], oxprenolol [e.g., Trasicor], penbutolol
[e.g., Levatol], pindolol [e.g., Visken], propranolol [e.g., Inderal], sotalol
[e.g., Sotacor], timolol [e.g., Blocadren]) - The effects of both the
timolol in the ophthalmic dorzolamide and timolol combination and the systemic
beta-adrenergic blocking agents may be increased
-
Calcium channel blocking agents (bepridil [e.g, Vascar], diltiazem
[e.g., Cardizem], felodipine [e.g., Plendil], flunarizine [e.g., Sibelium],
isradipine [e.g., DynaCirc], nicardipine [e.g., Cardene], nifedipine [e.g.,
Procardia], nimodipine [e.g., Nimotop], verapamil [e.g., Calan] or
-
Digitalis glycosides (heart medicine) when used together with calcium
channel blocking agents - Unwanted effects on the heart may be increased
-
Carbonic anhydrase inhibitor-type glaucoma medicine you take
by mouth (for example, acetazolamide [e.g., Diamox], dichlorphenamide [e.g.,
Daranide], or methazolamide [e.g., Neptazane]) - Effects of these medicines
on the body may be increased
-
Quinidine (e.g., Cardioquin) or
-
Reserpine (e.g., Serpasil) and other catecholamine-depleting medicines - Effects
of the ophthalmic dorzolamide and timolol combination may be increased, possibly
leading to slow heartbeat, low blood pressure, and fainting
Other medical problems - The presence of other medical
problems may affect the use of this medicine. Make sure you tell your doctor
if you have any other medical problems, especially:
-
Allergy, history of - Severity and duration of allergic reactions
to other substances may be increased
-
Asthma or
-
Bronchitis or
-
Emphysema or
-
Lung problems, other - This medicine can increase trouble in
breathing
-
Bradycardia (unusually slow heartbeat) or
-
Heart problems, other - There is a risk of further decreased
heart function
-
Diabetes mellitus (sugar diabetes) or
-
Hypoglycemia - If your blood sugar becomes too low, this medicine
may cover up some of the symptoms
-
Kidney disease, severe - Effects of this medicine may be increased
because of its slower removal from the body
-
Myasthenia gravis - This medicine may make this condition worse
-
Overactive thyroid - This medicine may cover up fast heartbeat,
which is a sign of overactive thyroid
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