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Studies have demonstrated doxycycline works in that group, but there’s not sufficient evidence to make the same recommendation for other people, agency officials said.

Most patients receive doxycycline, an antibiotic that usually clears up the infection.

Among them was the prediction that doxycycline, an antibiotic, could interact with warfarin, a commonly prescribed blood-thinner.

Her primary care physician prescribed doxycycline, but that was also ineffective.

Here’s what to know about doxycycline, called DoxyPEP when taken after exposure, and how to use it.