The present invention provides a method of treating or preventing an intracellular bacterial infection, comprising contacting the cell(s) which are infected with an antibacterial agent and a photosensitizing agent and irradiating the cell(s) with light of a wavelength effective to activate the photosensitizing agent, wherein the antibacterial agent is released into the cytosol of the cell(s) and kills, damages or prevents the replication of bacteria in said cell(s). The invention also provides related uses, and compositions, products and kits for the same.
