Doxycycline hyclate treats certain bacterial infections and is used with other drugs to treat acne and some amoeba infections, according to Drugs.com. It also may be prescribed to travelers to prevent certain types of malaria if they are visiting the infected area for less than four months.
Doxycycline hyclate is classified as a tetracycline antibiotic, notes Drugs.com. These types of antibiotics work by slowing the growth of bacteria, allowing the human immune system to destroy the bacteria. People should not take the drug if they are allergic to tetracycline antibiotics, are currently taking acitretin, isotretinoin or a penicillin, or have recently received a live typhoid oral vaccine.