Which antibiotic is commonly used for treating MRSA infections?

Daptomycin is an antibiotic that works effectively against Methicillin-resistant Staphylococcus aureus (MRSA) infections. It belongs to a class of antibiotics known as lipopeptides, which disrupt bacterial cell membrane function, leading to cell death. This mechanism of action makes daptomycin particularly useful for treating complicated skin and soft tissue infections, as well as bacteremia and endocarditis caused by MRSA.

The other options do not adequately target MRSA. Azithromycin, for instance, is mainly effective against certain types of respiratory tract infections and does not cover MRSA. Ciprofloxacin, a fluoroquinolone, is effective against a variety of gram-negative bacteria but has limited efficacy against MRSA. Piperacillin, a penicillin derivative, may not be effective for MRSA as the organism is resistant to many beta-lactam antibiotics. Therefore, daptomycin is the most appropriate choice for managing MRSA infections due to its specific action against this resistant strain.