A chest infection is an infection of the lungs or large airways. Some chest infections are mild and clear up on their own, but others can be severe and life threatening. Some chest infections are mild and clear up on their own, but others can be severe and life threatening. Doxycycline is a tetracycline antibiotic that fights infection-causing bacteria in the body. It is used for many different types of infections, including sinus infections, or sinusitis in severe cases. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Grin on doxycycline chest infection: Sometimes tetracycline can treat a UTI. Please check with your doctor. Don't just take old meds that are lying around. Doxycycline Capsules are used in the treatment of a variety of infections caused by susceptible strains of Gram-positive and Gram-negative bacteria and certain other micro-organisms. I wondered if many people have been put on Doxycycline. I had one course of Amoxocillin which did not help my chest infection along with prednisolone. Uses: Doxycycline is prescribed for Acne, Infection and Chlamydia and is mostly mentioned together with these indications. In addition, our data suggest that it is taken for Lyme, although it is not approved for this condition*. Doxycycline will not treat a viral infection such as the flu or a common cold. If you need surgery, tell the surgeon ahead of time that you are using doxycycline. Store at room temperature away from moisture, heat and light. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Poinsett on doxycycline for chest infection: No Mernidazole is not the appropriate antibiotic for throat/chest infection. User Reviews for Doxycycline to treat Upper Respiratory Tract Infection. Also known as: Acticlate, Adoxa, Alodox, Avidoxy, Doryx, Mondoxyne NL, Monodox, Morgidox. Doxycycline is an antibiotic. It's used to treat infections such as chest infections, skin infections, rosacea, dental infections and sexually transmitted infections (STIs), as well as a lot of other rare infections.