| abstract |
A pharmaceutical composition, comprising a combination of an antibiotically active compound of the formula (I): with a β-lactamase inhibitor of one of the formulae (II) to (XIII) are active against Gram-negative bacteria, in particular such bacteria which have become resistant against antibiotics such as aztreonam, carumonam and tigemonam. Optionally the compositions may comprise another β-lactamase inhibitor of one of the formulae (II) to (XIII), particularly of formula (V) or formula (VI). |