Helps you acclimatise faster at altitude — but it is not a substitute for ascending slowly.
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Acetazolamide is a carbonic anhydrase inhibitor. It makes the kidneys excrete bicarbonate, producing a mild metabolic acidosis — which stimulates you to breathe more deeply and more often.
That extra breathing is the point. At altitude it raises your blood oxygen and speeds up the acclimatisation your body would eventually manage on its own.
It accelerates acclimatisation; it does not replace it. Someone taking acetazolamide who ascends too fast can still develop severe altitude illness.
Its use for altitude sickness is off-label in the UK, though it is long-established and recommended in international wilderness medicine guidance.
A trial dose at home before the trip is sensible, so you discover any reaction somewhere with a pharmacy rather than at 4,000m.
These need descent and urgent help, not tablets:
Both are life-threatening and the treatment is immediate descent.
No monitoring is needed for a few days of travel use in a healthy person.
Prolonged use warrants electrolyte and kidney function checks.
Yes, as part of a travel health consultation for a trip to genuine altitude — not as a tablet issued in isolation.
The consultation is where the value is, because acetazolamide is the smaller half of altitude safety. What it covers:
Use for altitude sickness is off-label in the UK, which we will explain properly rather than gloss over.
What we will not do is supply it as an alternative to a sensible ascent plan. A prescription is never guaranteed. This page is information, not an offer to supply.
Acetazolamide is an inexpensive generic. On a private prescription the cost is modest — a course for a trek is a small part of the trip budget.
It is not available on the NHS for altitude sickness, since travel-related prescribing is not an NHS service. Its licensed uses are.
Stop after 2 to 3 days at your maximum altitude, once acclimatised, or on descent. No tapering is needed.
Stop immediately and seek help for any spreading or blistering rash.
Stop ascending. That alone resolves most mild altitude sickness within a day or two.
If symptoms worsen, or there is any confusion, unsteadiness or breathlessness at rest — descend immediately. Descent is the only definitive treatment, and delaying it is what turns altitude sickness into a fatal illness.
No, and this is the dangerous misunderstanding. It speeds acclimatisation; it does not replace it. People taking acetazolamide still get severe altitude illness if they ascend too fast.
That is the classic and expected effect — harmless, and not a reason to stop.
Fizzy drinks taste flat or unpleasant on acetazolamide. It is a well-known quirk of the drug and it resolves when you stop.
24 hours before you start ascending, continuing for 2 to 3 days at your highest altitude.
Stop going up. Most mild cases settle in a day or two at the same altitude. Confusion, unsteadiness or breathlessness at rest means descend immediately — those are emergencies.
Not with a severe sulfonamide allergy. Tell us about any drug allergy before travel.
No — use for altitude sickness is off-label in the UK, though it is long-established and recommended in international altitude medicine guidance. We will explain what that means.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
September 8, 2026
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