Ceftriaxone injection is a broad-spectrum antibiotic used to treat various bacterial infections, including respiratory, urinary tract, skin, and bloodstream infections. It's also effective for treating severe infections like meningitis and gonorrhea. Ceftriaxone works by inhibiting bacterial cell wall synthesis, leading to the death of bacteria. Administered via intramuscular or intravenous injection, it's commonly prescribed in hospitals due to its potency and long duration of action. The treatment is generally well-tolerated, though side effects like diarrhea, rash, or allergic reactions may occur.

Cephalexin is an antibiotic belonging to the cephalosporin class, used to treat a variety of bacterial infections. It works by inhibiting the synthesis of bacterial cell walls, leading to cell rupture and death. Cephalexin is particularly effective against gram-positive bacteria, including Streptococcus and Staphylococcus, making it useful for treating skin infections, respiratory tract infections, urinary tract infections, and bone infections.