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A plain-language summary of the cited sources below. Informational only — not medical advice.
Acetazolamide works by blocking an enzyme called carbonic anhydrase, which is found in red blood cells and other tissues throughout the body. When this enzyme is blocked, carbonic acid builds up. This might sound unusual as a way to help someone, but the effect reduces fluid build-up in certain parts of the body and lowers pressure inside the eye. It's prescribed for several conditions: fluid retention caused by heart failure or some medications, certain types of seizures, and different forms of glaucoma where lowering eye pressure is needed.
The medication has a relatively short half-life of 2 to 4 hours, meaning it clears from the body fairly quickly and typically needs to be taken multiple times a day to maintain its effect.
Common side effects your family member might experience include headaches, nausea, vomiting, diarrhoea, and drowsiness. These don't happen to everyone, but they're the effects doctors see most often. If any of these become troublesome, it's worth discussing with the prescribing doctor.
There are also serious side effects that are less common but need urgent medical attention if they occur. These include severe allergic reactions that can cause shock, blood disorders affecting the production of blood cells in the bone marrow, severe skin reactions, liver failure, and fluid build-up in the lungs that isn't related to heart problems. While these are uncommon, knowing they're possible helps you recognise warning signs early.
Acetazolamide can't be used in people with certain conditions. These include particular imbalances in blood chemistry, kidney function below a certain threshold, severe liver disease, allergy to sulfonamide medications or related compounds, and specific types of glaucoma where the medication could mask worsening disease. The prescribing doctor will have checked whether your family member has any of these conditions before starting the medication.
For prescribing by certain health practitioners Clinical criteria: Treatment criteria: Must be treated by a health practitioner who is any of: (i) a medical practitioner, (ii) a nurse practitioner who is continuing treatment with this medicine (of any strength) that was initiated by a medical practitioner as a PBS benefit.
“DIAMOX (acetazolamide) is a carbonic anhydrase inhibitor.”
“2–4 hours”
A plain-language summary of the cited sources below. Informational only — not medical advice.
Acetazolamide is a carbonic anhydrase inhibitor that reduces the formation of aqueous humour and cerebrospinal fluid by blocking the enzyme catalysing the conversion of carbon dioxide and water to carbonic acid. TGA-approved indications include chronic simple (open-angle) glaucoma, secondary glaucoma, acute angle-closure glaucoma as a temporising measure preoperatively, oedema due to congestive heart failure or drug-induced causes, and centrencephalic epilepsies (petit mal, unlocalized seizures). The plasma half-life is 2–4 hours.
Contraindications include hyperchloraemic acidosis, hypokalaemia, hyponatraemia, adrenal insufficiency, renal impairment with GFR below 10 mL/min, and marked hepatic disease or cirrhosis owing to reduced ammonia clearance and risk of hepatic encephalopathy. Hypersensitivity to acetazolamide, sulfonamides, or sulfonamide derivatives contraindicates use; cross-sensitivity is possible. Common adverse effects include headache, nausea, vomiting, diarrhoea, and drowsiness. Serious adverse effects include anaphylaxis with reported fatalities, bone marrow suppression (aplastic anaemia, agranulocytosis, leukopenia, thrombocytopenia, pancytopenia), Stevens-Johnson syndrome, toxic epidermal necrolysis, fulminant hepatic necrosis, and non-cardiogenic pulmonary oedema.
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Curated subset. The full adverse-effect list is in the TGA Product Information; click any citation above to open it.