Travel Medicine · Costa Rica · Destination
It depends on your route. CDC recommends malaria prevention medicine for Alajuela and Limón provinces, including Arenal and La Fortuna in Alajuela. For other areas, such as San José, Monteverde, Manuel Antonio and the Guanacaste beaches, CDC recommends mosquito precautions rather than malaria pills. Review side trips as well as your main hotel location.
| Destination | Malaria prevention | CDC guidance |
|---|---|---|
| Alajuela and Limón provinces, including Arenal and La Fortuna | Recommended | Discuss prevention medicine with a clinician; mosquito precautions are also needed. |
| Other areas, including San José, Monteverde, Manuel Antonio and Guanacaste beaches | Mosquito precautions | CDC does not recommend routine malaria pills here. Confirm each stop against the destination map. |
A trip that includes Alajuela or Limón needs a malaria-prevention plan. Staying in a resort does not change CDC's province-level recommendation. Medication choice depends on your health, medicines and full route.
For Costa Rica's listed areas the CDC includes atovaquone-proguanil (Malarone), chloroquine, doxycycline, mefloquine, and tafenoquine. Two of those, doxycycline and Malarone, we prescribe for a flat $45, sent to your own pharmacy when clinically appropriate. Medication is paid separately. See doxycycline vs Malarone.
I am Bidwell Cranage, a nurse practitioner and Member of the International Society of Travel Medicine, and I have had traveler's diarrhea elsewhere in Central America.
Stomach trouble is the most common thing to derail a Costa Rica trip. Many travelers carry a standby azithromycin course so they can treat a bad case on the road. Dengue, spread by daytime mosquitoes, is also present, so repellent and covering up matter even where malaria pills are not needed. There is no pill that prevents dengue.
We do not give vaccines. We refer you to a travel clinic for those and can handle a standby antibiotic online. See online travel medicine vs a travel clinic.
A $45 visit can assess malaria prevention for Alajuela or Limón, motion-sickness prevention and whether a standby diarrhea antibiotic fits your trip. Medication is paid separately at your chosen pharmacy. We refer vaccine needs and medicines outside our scope to a travel clinic; prescription approval is not guaranteed.
Destination recommendations checked October 15, 2026. CDC destination guidance provides current malaria areas and vaccine entry rules. Check every stop and transit country; recommendations and entry rules can change.
It depends on your route. CDC recommends malaria prevention medicine for Alajuela and Limón provinces, including Arenal and La Fortuna in Alajuela. For other areas, such as San José, Monteverde, Manuel Antonio and the Guanacaste beaches, CDC recommends mosquito precautions rather than malaria pills. Review side trips as well as your main hotel location.
Yes. Arenal and La Fortuna are in Alajuela province, where CDC recommends malaria prevention medicine plus mosquito precautions. A clinician selects a suitable drug after reviewing your itinerary and medical history; this is not simply an optional add-on for peace of mind.
Not for travel directly from the United States; the CDC does not recommend yellow fever vaccine for Costa Rica itself. It is only required if you are arriving from a country with yellow fever risk. Hepatitis A and, for some travelers, typhoid are recommended, and those are shots, so we refer you to a travel clinic for them.
Prepare for food- and waterborne illness and mosquito-borne infections, including dengue. Oral rehydration and food, water and hand precautions matter. A standby antibiotic is an individual decision for significant diarrhea, not a routine treatment for every loose stool. Malaria prevention also matters for trips into Alajuela or Limón.
Fever during or after travel to a malaria-risk area needs prompt medical assessment. Tell the clinician your itinerary even if you took prevention medicine. Do not wait for a routine online visit or assume it is traveler's diarrhea.