September 3, 2014
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Drug Factsheets

 Health Home >> Medications 

Acetazolam

(acetazolamide)

DIN (Drug Identification Number)

00295019 ACETAZOLAM 250 MG TAB

What side effects are possible with Acetazolam?

Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below are not experienced by everyone who takes this medication. If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor.

The following side effects have been reported by at least 1% of people taking this medication. Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

  • confusion
  • diarrhea
  • drowsiness
  • increased urination
  • loss of appetite
  • malaise (generally feeling of discomfort)
  • metallic taste
  • nausea or vomiting

Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not check with your doctor or seek medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

  • blood in urine
  • dark-coloured stools
  • fever
  • hives
  • rash
  • red or purple spots on the skin
  • ringing in ears or hearing loss
  • tingling feeling in fingers and toes

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking this medication.





Are there any other precautions or warnings for Acetazolam?

Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.

Allergies: Some people who are allergic to a group of medications called sulfonamides may experience a reaction to acetazolamide. If you have a known sulfonamide allergy, your doctor may monitor you for any allergic reactions.

Blood tests: Your doctor may recommend you get lab tests to check your blood at regular intervals while you are taking acetazolamide.

Diabetes: Acetazolamide may increase blood sugar or urine sugar levels. If you have diabetes, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.

Drowsiness/reduced alertness: This medication may make you drowsy. Do not drive or engage in other activities requiring alertness if the medication affects you in this way.

Lungs: If you have certain lung problems, your doctor will closely monitor your condition while you are taking acetazolamide, as it may affect the amount of oxygen in your body.

Pregnancy: This medication should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking this medication, contact your doctor immediately.

Breast-feeding: This medication passes into breast milk. If you are a breast-feeding mother and are taking acetazolamide, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.

Children: The safety and effectiveness of using this medication have not been established for children.

What other drugs could interact with Acetazolam?

There may be an interaction between acetazolamide and any of the following:

  • acetylsalicylic acid (high doses)
  • cyclosporine
  • droperidol
  • mefloquine
  • memantine
  • methadone
  • methotrimeprazine
  • mirtazapine
  • phenobarbital
  • phenytoin
  • pimozide
  • primidone
  • quinidine
  • rituximab
  • topiramate
  • zolpidem

If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:

  • stop taking one of the medications,
  • change one of the medications to another,
  • change how you are taking one or both of the medications, or
  • leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Medications other than those listed above may interact with this medication. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.

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