Yudoxi-LB Capsule is a combination pharmaceutical formulation containing Doxycycline 100 mg and Lactobacillus 5 million spores, designed to provide effective antibacterial therapy while maintaining gastrointestinal flora balance. Doxycycline, a broad-spectrum tetracycline antibiotic, inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit, thereby exerting bacteriostatic activity against a wide range of gram-positive and gram-negative pathogens. It is commonly indicated for respiratory tract infections, urinary tract infections, skin and soft tissue infections, and certain sexually transmitted infections. The inclusion of Lactobacillus, a probiotic strain, helps restore and preserve the natural intestinal microbiota, which may be disrupted during antibiotic therapy, thereby reducing the risk of antibiotic-associated diarrhea and other gastrointestinal disturbances. Yudoxi-LB is particularly beneficial in patients requiring prolonged antibiotic treatment or those prone to dysbiosis. The capsule formulation ensures convenient oral administration with good bioavailability. It is recommended to be taken with a full glass of water, preferably on an empty stomach or as advised by a healthcare professional. Caution is advised in patients with hypersensitivity to tetracyclines, and concurrent use with antacids or iron supplements should be avoided to prevent reduced absorption. Yudoxi-LB Capsule offers a balanced approach to antimicrobial therapy by combining effective infection control with probiotic support.