Some parts of Bolivia like La Paz (3650m), Potosí (4010), Oruro (3950m) and the Lake Titicaca region are high altitude, so adequate precautions against "sorojchi" altitude sickness should be taken.
At local pharmacies they sell sorojchi pills, that are supposed to help with altitude problems. It has painkillers as well as natural herbs to help cope with the symptoms of "sorojchi". In many parts of the Altiplano you can purchase coca leaves, which are reputed to be useful against soroche. Coca tea ("mate de coca") is available in tea bags in many markets.
However, severe cases of high altitude disease can be treated at the High Altitude Pathology Institute at Clinica IPPA. This Clinic has the most advanced technology including a hyperoxic/hypoxic adaptation chamber. In addition, the sun's ultraviolet rays are much stronger - up to 20 times - than at sea level. A sun hat, sunglasses, and skin protection (sunblock or long sleeves) are advised.
You can't usually drink tap water in Bolivia. There's plenty of bottled water being sold in the stores. One note though: if you're not a Coca-Cola company (very strong in Bolivia) fan, in some towns you may have trouble getting water from other manufacturer.
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