Altitude Sickness in Bolivia: An Honest Guide

La Paz sits at 3,640 meters. El Alto, the city that sprawls above it on the rim of the Altiplano, sits at 4,150 meters. If you fly in from Lima or São Paulo — both at or near sea level — your body has had exactly zero minutes to adjust. The airport at El Alto is where the journey begins, and where altitude sickness announces itself.

Let me be direct about something before the lists and the tips: altitude sickness is real, it is uncomfortable, and for a small percentage of people it becomes genuinely dangerous. This guide tells you what the hotels and tour operators often soft-pedal.

What altitude sickness actually feels like

Acute Mountain Sickness (AMS) — soroche in Bolivia — is not one thing. It is a spectrum, and where you fall on that spectrum depends less on your fitness than on how quickly you ascended and how well you hydrated.

The mild version, which affects roughly 25 to 40 percent of visitors arriving by air from sea level, feels like a persistent headache that starts a few hours after arrival, combined with unusual tiredness, mild nausea and sleep that never quite restores you. You wake up at 2 am with a pounding head and lie there calculating whether you need a hospital.

The moderate version adds vomiting, a pronounced inability to concentrate, and an unsteadiness you might dismiss as tiredness. At this point you need to stop what you are doing, rest, and drink water.

The severe version — High Altitude Pulmonary Edema (HAPE) or High Altitude Cerebral Edema (HACE) — is a medical emergency. Signs include confusion, inability to walk in a straight line, a cough that produces pink froth, or lips and fingernails turning blue. If you see any of these symptoms in yourself or a companion, you need emergency care immediately, at Clínica Alemana or any major clinic in La Paz. Do not wait it out.

The mistake most people make is confusing the mild version with “not really altitude sickness” and then trying to push through a packed day one. Rest is the medicine. The city will still be there on day two.

The first 24 to 72 hours: what to do

Most visitors acclimate sufficiently within one to three days. Here is what that period should look like.

Arrive and rest. Do not book a tour for day one. Check into your accommodation, get horizontal, and let your body figure out what altitude means. Your red blood cell count will begin rising; your breathing will deepen slightly; your kidneys will start adjusting pH. This takes time.

Drink water relentlessly. The Altiplano air is dry and breathing increases insensible fluid loss. Aim for at least three to four liters on your first day. Avoid alcohol entirely for the first 48 hours — it worsens AMS and disrupts the sleep you desperately need.

Eat light. Your digestive system is also affected by altitude. A carbohydrate-heavy meal on day one will often make nausea worse. Soups, bread, fruit — nothing that requires sustained effort from your gut.

Mate de coca. Coca tea, served free at most accommodation in La Paz, is a traditional Andean remedy. It will not cure AMS, and the science on its physiological benefit is modest. What it does is ease mild headache and nausea, keep you hydrated, and — perhaps most usefully — signal to your body that you are doing something about the problem. Chewing coca leaves directly is more effective than tea. Both are legal in Bolivia. If you are subject to workplace drug testing, be aware that coca products can in rare cases trigger a positive for cocaine metabolites — consult your employer or testing provider before consuming them.

Ascend slowly if you can. If your route allows, spending a night in Cusco (3,400 m) or even Puno (3,827 m) before La Paz gives your body a head start.

Diamox: the medical option

Acetazolamide, sold as Diamox, is a diuretic that speeds acclimatisation by forcing the kidneys to excrete bicarbonate, which acidifies the blood and stimulates deeper breathing. It works. Studies consistently show it reduces the incidence and severity of AMS.

The standard preventive dose is 125 to 250 mg twice daily, starting 24 hours before ascent and continuing for 48 hours after reaching altitude. It makes you urinate more and can cause tingling in the fingers and toes — both are expected. It should not be taken by anyone with a sulfa drug allergy, and you need a prescription from your doctor before you travel.

Do not buy Diamox from unverified street pharmacies or online sources. In Bolivia, legitimate farmacias can sometimes sell it without a prescription, but confirm what you are buying.

Timeline: what to expect

• Hours 1–6: Flight lands, you feel fine, maybe slightly lightheaded. Headache may begin.
• Hours 6–18: Headache peaks. Sleep is disrupted. This is the hardest stretch.
• Day 2: You feel better but are not at 100 percent. Take it easy. Walk, eat, drink. Skip strenuous hikes.
• Day 3: Most people feel genuinely functional. A moderate walk around the city is fine.
• Day 4 onwards: You can engage normally with the city. Altitude remains — you are not immune — but your body has largely adapted to the baseline.

When to go to the hospital

Go immediately if:

• Symptoms worsen after 48 hours rather than improving
• You are confused or disoriented
• You cannot walk in a straight line
• You have a cough with pink or bloody froth
• Someone’s lips, fingertips or nails are turning blue

In La Paz, Clínica Alemana (Av. 6 de Agosto) and Clínica del Sur are the most recommended facilities for travellers. Keep the address of the nearest 24-hour clinic on your phone from the moment you land.

Practical tips

• Acclimatise before touring: save the Death Road, Uyuni and any trekking for day three or later.
• Sleep at lower altitude if possible: some travelers who struggle in La Paz (3,640 m) find they sleep significantly better in Sucre (2,750 m) or Cochabamba (2,550 m) and plan longer stays there.
• Avoid sleeping pills and antihistamines in the first 48 hours — they suppress the breathing response your body is using to compensate.
• Eat carbohydrates rather than fats and protein in the first days — they require less oxygen to metabolise.
• Pack ibuprofen for headaches. Aspirin also works. Avoid codeine.
• Tell your travel partner the HACE/HAPE warning signs before you arrive. Confusion is one of the symptoms — you may not be able to assess your own condition.
• Children and older adults need more time to acclimatise; altitude affects them at lower altitudes than young adults.

Bolivia rewards the traveller who respects the altitude. The headache passes. The city that reveals itself on day three — the teleférico swooping over the canyon, the market at Mercado de las Brujas, the view from Mirador Killi Killi — is worth the discomfort of day one.