Dosage for diamox medicine
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acetazolamide prescribing information dosage FDA label
Diamox is acetazolamide. The correct dose depends entirely on why it was prescribed, your age, kidney function, and the formulation. Do not start or change the dose without the prescriber’s advice.
Common adult doses from prescribing references:
| Use | Typical adult dose |
|---|---|
| Prevention of altitude sickness | 125 mg by mouth twice daily, starting 24 hours before ascent and continuing for 48 hours after reaching peak altitude or longer if ascending. |
| Acute mountain sickness treatment | Often 250 mg twice daily under medical guidance. |
| Glaucoma / high eye pressure | Usually 250-1,000 mg/day in divided doses. Acute angle-closure glaucoma may require 500 mg IV or oral initially, given urgently by an eye specialist. |
| Edema / fluid retention | 250-375 mg once daily for 1-2 days, then a rest day, depending on the condition. |
| Idiopathic intracranial hypertension | Dosing is individualized and commonly started low, then increased by the treating neurologist or ophthalmologist. |
Key safety points:
- Dose reduction or avoidance may be needed with kidney disease, liver disease, low sodium/potassium, metabolic acidosis, or certain sulfonamide reactions.
- Common effects: tingling of fingers/toes, frequent urination, taste changes, nausea, fatigue.
- Seek urgent care for severe rash, breathing difficulty, confusion, marked weakness, or reduced urine output.
- It can interact with medicines such as high-dose aspirin, lithium, certain antiseizure medicines, and other diuretics.
For altitude prevention, the textbook-supported regimen is 125 mg twice daily, started a day before ascent. DailyMed prescribing information lists indication-specific dosing and warnings. ROSEN's Emergency Medicine, notes 125 mg twice daily for acute mountain sickness prevention (ROSEN's Emergency Medicine Concepts and Clinical Practice, block 26, lines 539-542).
What condition was Diamox prescribed for, and is it for an adult or child?
Moa
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acetazolamide mechanism of action carbonic anhydrase inhibitor DailyMed
Mechanism of action of Diamox (acetazolamide):
Diamox is a carbonic anhydrase inhibitor.
- It inhibits carbonic anhydrase in the proximal convoluted tubule of the kidney.
- This reduces conversion of CO₂ + H₂O to carbonic acid, so less H⁺ is available for the Na⁺/H⁺ exchanger.
- Therefore, less sodium and bicarbonate (HCO₃⁻) are reabsorbed.
- More sodium, bicarbonate, water, and some potassium are excreted in urine.
Main results
- Alkaline urine
- Mild diuresis
- Reduced serum bicarbonate, causing a hyperchloremic metabolic acidosis
- Increased ventilation, helpful in altitude illness
- Reduced aqueous-humor production, lowering intraocular pressure in glaucoma
- Reduced cerebrospinal-fluid production, useful in idiopathic intracranial hypertension
In the eye, carbonic anhydrase inhibition decreases aqueous humor formation and thus decreases intraocular pressure. Lippincott Illustrated Reviews: Pharmacology, states that acetazolamide inhibits carbonic anhydrase in proximal tubular cells (block 1, line 4920); Goodman & Gilman’s Pharmacological Basis of Therapeutics notes reduced aqueous-humor formation and intraocular pressure (block 8, line 1685).
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