Doxycycline and Lactic Acid Bacillus Tablets are a combination medication used to treat a variety of bacterial infections while helping to maintain gut health. Doxycycline is a broad-spectrum antibiotic that works by inhibiting bacterial protein synthesis, making it effective against infections such as respiratory tract infections, UTIs, acne, and sexually transmitted infections. Lactic Acid Bacillus is a probiotic that restores healthy gut bacteria and helps prevent diarrhea and digestive issues often caused by antibiotics.