The present invention provides compositions comprising fosfomycin or a pharmaceutically acceptable salt, solvate or prodrug thereof (e.g., fosfomycin disodium) alone or in combination with an antibacterial agent. The present invention provides methods of treating bacterial infections, which include administering an effective amount of fosfomycin or a pharmaceutically acceptable salt, solvate or a prodrug thereof (e.g., fosfomycin disodium) alone or in combination with an antibacterial agent.