Doxycycline is a great drug for travelers. I know some people are given doxycycline for acne and other bacterial infections. But doxycycline is a traveler's drug in my opinion. It's good for many of the ailments that travelers suffer from. I think everyone who is planning a trip to tropical areas or less developed areas of the world ought to take it as a precautionary measure.
I also know from experience that doxyclcine is great for preventing food poisoning which is always a problem in some countries.