So, you’ve booked that dream trip. Maybe you’re trekking to Machu Picchu in Peru, hiking the Himalayas in Nepal, or perhaps tackling the high peaks of Kilimanjaro. The excitement is real, but so is the altitude.

For Canadian travellers, high-altitude destinations offer incredible experiences, but they also come with a specific health risk: Acute Mountain Sickness (AMS). The good news? With the right plan and the right altitude sickness medication that Canadian travellers can access easily, you can prevent it from ruining your trip.

At Virtual Travel Clinic, we help you stay healthy so you can focus on the adventure. Here is everything you need to know about altitude sickness prevention and how to get Diamox, which travellers in Canada rely on,  all sourced directly from our travel health experts.

What is Altitude Sickness?

Altitude sickness, also known as acute mountain sickness (AMS), happens when your body struggles to adapt to lower oxygen levels at high elevations. It typically occurs when individuals ascend above 2,400 metres (8,000 feet) too quickly. Lower air pressure reduces the partial pressure of oxygen, affecting how your body’s tissues and organs function.

Altitude sickness symptoms can range from mild to severe and may not appear immediately upon arrival at high altitudes. Common symptoms include:

• Headache
• Dizziness
• Fatigue
• Nausea
• Loss of appetite
• Difficulty sleeping

Some individuals may also experience shortness of breath, rapid heartbeat, and a general feeling of malaise. In Peru’s high-altitude regions, such as Cusco and Lake Titicaca, symptoms such as vomiting and dizziness are frequently reported. In Nepal, rapid ascent without proper acclimatization is the primary risk factor, and symptoms often include headache, nausea, and fatigue.

It’s important to note that symptoms can vary from person to person, and they may develop gradually. If you notice any of these signs, take them seriously; early recognition allows you to rest, hydrate, and descend if needed before the condition worsens.

High Altitude Travel: Know Your Destination

Different destinations carry different risks. Here’s a quick look at popular high-altitude spots for Canadian travellers:

Peru is known for its rich history and the Inca Empire, with iconic sites like Machu Picchu and Lake Titicaca, the highest navigable lake in the world. Nepal boasts ten of the world’s highest peaks, including Mount Everest, and requires special care for trekkers.

Canadian Tip: Even if you live in Calgary or Vancouver, you are not used to elevations above 3,000m. Do not let your fitness level fool you; high altitude travel affects everyone differently. Anyone can develop altitude sickness, regardless of age, gender, or fitness level.

How to Prevent Altitude Sickness

Prevention is always better than treatment. Here are the top ways to avoid AMS, based on advice from Virtual Travel Clinic:

1. Ascend Gradually

The golden rule of high altitude travel: Climb high, sleep low. Increase your elevation gradually, especially above 2,400 metres. Take regular breaks during your climb to allow your body to adjust.

2. Stay Hydrated

Drink plenty of fluids, preferably water. Avoid excessive alcohol and caffeinated beverages, as they can contribute to dehydration.

3. Maintain Physical Fitness

Good fitness before your trip can help your body adapt to altitude changes.

4. Consider Medication for Altitude Sickness

Consult your healthcare provider about medications that can help prevent altitude sickness. Acetazolamide (commonly known as Diamox) is often prescribed to promote acclimatization. In Peru, taking necessary precautions such as slowly acclimatizing, using medication for altitude sickness, and staying hydrated is recommended. In Nepal, rapid ascent without proper acclimatization is the primary risk factor.

What is Diamox (Acetazolamide)?

Diamox (generic name: Acetazolamide) is the most commonly prescribed altitude sickness medication by Canadian travel doctors. It helps your body acclimatize faster by accelerating your breathing and increasing oxygen levels.

Who needs Diamox?

• Travellers going above 2,400 metres
• Those with a history of altitude sickness
• People with a fast ascent schedule (e.g., flying directly to Cusco)
• Anyone who wants extra peace of mind

Important: Diamox is a prescription medication. You cannot buy it over the counter in Canada. You need a consultation with a travel health professional, such as the team at Virtual Travel Clinic.

How to Get Altitude Sickness Medication in Canada

Getting altitude sickness medication Canada travellers has never been easier. You don’t even need to leave your house.

Step 1: Book an Online Consult

Visit Virtual Travel Clinic and book a travel health consultation. This is a virtual appointment with a Canadian-licensed practitioner.

Step 2: Discuss Your Itinerary

Tell us where you are going, how high you will be, and how quickly you plan to ascend. We will assess your risk and recommend the best prevention plan.

Step 3: Get Your Prescription

If Diamox is right for you, we will send the prescription directly to your preferred pharmacy.

Step 4: Travel Confidently

Start your medication as directed (usually 1–2 days before ascent) and enjoy your trip without worry.

Ready to book? Secure your health now. 

Cost and Considerations

• Consultation Fee: Affordable and often covered by private health insurance.
• Medication Cost: Diamox is generally inexpensive (often under $30 for a full trip supply).
• Side Effects: You may experience tingling in your fingers or toes, or a change in taste (especially with carbonated drinks). These are harmless and go away after stopping the medication.

Altitude Sickness FAQs for Canadian Travellers