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For the latest info on health risks when traveling to Mexico, and what to do if you get sick, consult the U.S. Department of State's website (www.travel.state.gov), the CDC website (www.cdc.gov), or the World Health Organization website (www.who.int).

General Availability of Healthcare

In most of Mexico's resort destinations, you can usually find healthcare that meets U.S. standards. Care in more remote areas is limited. Standards of medical training, patient care, and business practices vary greatly among medical facilities in beach resorts throughout Mexico. Cancún has first-rate hospitals, for example, but other cities along the Caribbean coast often do not. In recent years, some U.S. citizens have complained that certain healthcare facilities in beach resorts have taken advantage of them by overcharging or providing unnecessary medical care. On the other hand, Mexican doctors often spend more time with patients than doctors do north of the border, and may be just as good for less cost. Only rudimentary healthcare is generally available in much of Chiapas, Tabasco, and the Yucatán.

Prescription medicine is broadly available at Mexico pharmacies, and many drugs that in the U.S. require a prescription can be obtained in Mexico simply by asking. However, be aware that you may still need a copy of your prescription or may need to obtain a prescription from a local doctor.

Over-the-Counter Drugs in Mexico -- Antibiotics and other drugs that you'd need a prescription to buy in the States are often available over the counter in Mexican pharmacies. Mexican pharmacies also carry a limited selection of common over-the-counter cold, sinus, and allergy remedies. Contact lenses can be purchased without an exam or prescription.

Common Ailments

Sun/Elements/Extreme Weather Exposure -- Mexico is synonymous with sunshine; much of the country is bathed in intense sunshine for much of the year. Avoid excessive exposure, especially in the tropics where UV rays are more dangerous. The hottest months in Mexico's south are April and May, but the sun is intense most of the year.

Dietary Red Flags -- Travelers' diarrhea -- often accompanied by fever, nausea, and vomiting -- used to attack many travelers to Mexico. (Some in the U.S. call this "Montezuma's revenge," but you won't hear it called that in Mexico.) Widespread improvements in infrastructure, sanitation, and education have greatly diminished this ailment, especially in well-developed resort areas. Most travelers make a habit of drinking only bottled water, which also helps to protect against unfamiliar bacteria. In resort areas, and generally throughout Mexico, only purified ice is used. If you do come down with this ailment, nothing beats Pepto Bismol, readily available in Mexico. Imodium is also available in Mexico and is used by many travelers for a quick fix. A good high-potency (or "therapeutic") vitamin supplement and even extra vitamin C can help; yogurt is good for healthy digestion.

Because dehydration can quickly become life-threatening, be careful to replace fluids and electrolytes (potassium, sodium, and the like) during a bout of diarrhea. Drink Pedialyte, a rehydration solution available at most Mexican pharmacies, or natural fruit juice, such as guava or apple (stay away from orange juice, which has laxative properties), with a pinch of salt added.

The U.S. Public Health Service recommends the following measures for preventing travelers' diarrhea: Drink only purified water (boiled water, canned or bottled beverages, beer, or wine). Choose food carefully. In general, avoid salads (except in first-class restaurants), uncooked vegetables, undercooked protein, and unpasteurized milk or milk products, including cheese. Choose food that is freshly cooked and still hot. Avoid eating food prepared by street vendors. In addition, something as simple as clean hands can go a long way toward preventing an upset stomach.

High-Altitude Hazards -- Travelers to certain regions of Mexico occasionally experience elevation sickness, which results from the relative lack of oxygen and the decrease in barometric pressure that characterizes high elevations (more than 1,500m/5,000 ft.). Symptoms include shortness of breath, fatigue, headache, insomnia, and even nausea. Mexico City is at 2,240m (7,349 ft.) above sea level, and a number of other central and southern cities, such as San Cristóbal de las Casas, are as high as or even higher than Mexico City. At high elevations, it takes about 10 days to acquire the extra red blood corpuscles you need to adjust to the scarcity of oxygen. To help your body acclimate, drink plenty of fluids, avoid alcohol, and don't overexert yourself during the first few days. If you have heart or lung trouble, consult your doctor before traveling to places above 2,400m (7,872 ft.).

Bugs, Bites & Other Wildlife Concerns -- Mosquitoes and gnats are prevalent along the coast and in the Yucatán lowlands. Repelente contra insectos (insect repellent) is a must, and you can buy it in most pharmacies. If you'll be in these areas and are prone to bites, bring along a repellent that contains the active ingredient DEET. Another good remedy to keep the mosquitoes away is to mix citronella essential oil with basil, clove, and lavender essential oils. If you're sensitive to bites, pick up some antihistamine cream from a drugstore at home.

Most readers won't ever see an alacrán (scorpion). But if one stings you, go immediately to a doctor. The one lethal scorpion found in some parts of Mexico is the Centruroides, part of the Buthidae family, characterized by a thin body, thick tail and triangular-shaped sternum. Most deaths from these scorpions result within 24 hours of the sting as a result of respiratory or cardiovascular failure, with children and elderly people most at risk. Scorpions are not aggressive (they don't hunt for prey), but they may sting if touched, especially in their hiding places (which can include shoes). In Mexico, you can buy scorpion-toxin antidote at any drugstore. It is an injection, and it costs around $25. This is a good idea if you plan to camp in a remote area, where medical assistance can be several hours away. Note that not all scorpion bites are lethal, but a doctor's visit is recommended regardless.

Tropical Illnesses -- You shouldn't be overly concerned about tropical diseases if you stay on the normal tourist routes and don't eat street food. However, both dengue fever and cholera have appeared in Mexico in recent years. Talk to your doctor or to a medical specialist in tropical diseases about precautions you should take. You can protect yourself by taking some simple precautions: Watch what you eat and drink; don't swim in stagnant water (ponds, slow-moving rivers, or wells); and avoid mosquito bites by covering up, using repellent, and sleeping under netting. The most dangerous areas seem to be on Mexico's west coast, away from the big resorts.

On occasion, coastal waters from the Gulf of Mexico can become contaminated with rapid growth in algae (phytoplankton), leading to a phenomenon known as harmful algal bloom or a "red tide." The algal release of neurotoxins threatens marine life and can cause rashes and even flulike symptoms in exposed humans. Although red tides happen infrequently, you should not enter the water if you notice a reddish-brown color or are told there is a red tide.

Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.