The Guide To Acetazolamide (Diamox®) for Altitude Sickness

What Is Acetazolamide?

Acetazolamide, sometimes known by the brand name Diamox®, is a prescription medication commonly used to help prevent altitude sickness. It has been used for many years by trekkers, climbers and travellers visiting high-altitude destinations around the world.

Unlike treatments that simply relieve symptoms after they occur, Acetazolamide helps the body adapt more efficiently to altitude — reducing the likelihood of developing altitude sickness in the first place. For this reason, it is often recommended for travellers planning to spend time at elevations where altitude-related illness becomes more common.

How Does Acetazolamide Work?

As altitude increases, the body has to work harder to obtain oxygen from the air. Acetazolamide helps by encouraging deeper and more frequent breathing, which improves oxygen levels in the bloodstream and helps the body adjust more quickly to lower oxygen environments.

In simple terms, the medication helps speed up the natural acclimatisation process. It is important to remember, however, that Acetazolamide does not replace sensible acclimatisation practices — travellers should still ascend gradually whenever possible and follow appropriate trekking or travel itineraries.

Who Should Consider Acetazolamide?

Acetazolamide may be worth considering for travellers visiting destinations where altitude sickness is a recognised risk. It may also be considered by travellers who have previously experienced altitude sickness, or those who know they will be ascending rapidly to higher elevations. Suitability depends on several factors, including your itinerary, planned altitude and medical history.

• Everest Base Camp and trekking routes in Nepal
• Mount Kilimanjaro in Tanzania
• Cusco and Machu Picchu in Peru
• La Paz in Bolivia
• The Andes Mountains
• Tibet and Himalayan regions

When Should Acetazolamide Be Started?

The timing of Acetazolamide is important. It is typically started before reaching high altitude so that the medication can begin supporting the acclimatisation process before symptoms develop. The exact timing and dosage can vary depending on the traveller and their itinerary.

What Are the Possible Side Effects?

Like all medications, Acetazolamide can cause side effects. Most are mild and temporary, and many travellers experience few or no problems. If side effects occur, they often resolve once treatment is completed.

A healthcare professional can discuss the potential benefits and risks based on your individual circumstances before treatment is supplied.

Is Acetazolamide Suitable for Everyone?

No medication is suitable for everyone. Certain medical conditions, allergies and medications may affect whether Acetazolamide is appropriate for you — which is one reason why a travel health consultation is recommended before treatment is supplied.

During a consultation, your medical history can be reviewed and any potential concerns discussed before a decision is made. This helps ensure that any treatment provided is safe and appropriate for your travel plans.

What to Do Next

Altitude sickness can affect anyone travelling to high-altitude destinations, regardless of age, fitness level or previous travel experience. For many travellers, Acetazolamide can be a useful tool for reducing the risk of altitude sickness and supporting the body’s natural acclimatisation process.

If you’re planning a trip to a high-altitude destination and would like advice about altitude sickness prevention, our team at The Kingston Pharmacy can help. We can assess your travel plans, discuss whether Acetazolamide may be suitable for you and provide personalised guidance to help you travel safely and confidently. Book a travel health consultation today and ensure you’re properly prepared before travelling to altitude.