Posology for severe respiratory tract infections, severe bone and joint infections In severe respiratory tract infections as well as in severe bone and joint infections, higher doses than that currently recommended (such as 750 mg x 3/ day or 1000 mg x 2/ day) for oral route are currently used in clinical practice given the known decreased susceptibility of the main pathogens involved (including Pseudomonas aeruginosa, Acinetobacter, Staphylococcus aureus) and the severity of the disease (as well as the difficulties in reaching optimal concentration at the bone level).