Ampicillin and Cloxacillin Capsules are used to treat a variety of bacterial infections, including respiratory tract infections, skin infections, and urinary tract infections. Ampicillin is a broad-spectrum penicillin antibiotic that works by inhibiting bacterial cell wall synthesis, while cloxacillin is a penicillinase-resistant antibiotic effective against certain bacteria that produce enzymes to resist penicillin. Together, they target a wider range of bacteria. Typically taken several times a day, common side effects include nausea, diarrhea, and rash. It is important to complete the full course of the medication to prevent antibiotic resistance. Avoid taking with certain other medications and follow your healthcare provider’s instructions. Report any unusual symptoms or side effects to your healthcare provider.