The present invention discloses novel formulations, reconstitutable solid compositions, pharmaceutical compositions, and aqueous injectable formulations of specific amidine substituted beta-lactam compounds on the basis of modified cyclodextrins and organic and/or inorganic acids, their preparation and use as antimicrobial pharmaceutical compositions that are parenterally or orally administrable.本發明揭示以經改質環糊精及有機酸及/或無機酸為基底之經脒取代之特定β-內醯胺化合物的新穎調配物、可重構固體組合物、醫藥組合物及水性可注射調配物、其製備及作為可非經腸或經口投與之抗微生物醫藥組合物之用途。