Find patient medical information for Doxycycline on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Doxycycline hyclate is an antibiotic that treats many conditions, including acne, chlamydia, sinus infection, and urinary tract infection (UTI). It's taken by mouth, typically once or twice daily. It comes as capsules, tablets, and a liquid syrup. Side effects of doxycycline hyclate include stomach upset, nausea, and vomiting. Read expert insights on doxycycline hyclate, its unique properties, and its role in antibiotic therapy. Doxycycline hyclate is a generic prescription antibiotic taken as a tablet or capsule to treat various bacterial infections. As a tetracycline antibiotic, doxycycline works by blocking the ability of bacteria to grow and spread. Doxycycline can be taken in both immediate-release and delayed-release formats. Acticlate (Doxycycline Hyclate Tablets, USP) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Doxycycline capsules, delayed-release capsules, delayed-release tablets, and tablets and Acticlate® Cap capsules are also used to prevent malaria and treat anthrax infection after possible exposure and other conditions as determined by your doctor. Doxycycline belongs to the class of medicines known as tetracycline antibiotics. Doxycycline hyclate tablets and capsules are indicated for treatment of infections caused by the following gram-negative microorganisms, when bacteriological testing indicates appropriate susceptibility to the drug: Escherichia coli Enterobacter aerogenes Shigella species Acinetobacter species Urinary tract infections caused by Klebsiella species. Doxycycline is a tetracycline antibiotic used to treat many different bacterial infections such as acne, urinary tract infections, intestinal infections, and others. Doxycycline, a tetracycline antibiotic, is used to treat many different bacterial infections and skin conditions such as acne and rosacea. Different doxycycline products may have different instructions for how to take the medication. These products bind with doxycycline, preventing your body from fully absorbing the drug. When using to prevent malaria, take this medication as directed by your doctor, usually once daily, starting 1 to 2 days before travel. Continue to take this medication daily while in the malarious area.