Is this med, or the diluting soln preserved with sulfites???

My mother is Carolyn, the index patient for sulfite allergies. She is currently being treated for a resistant case of Pneumonia and Bronchitis. I am checking to see that the IV meds they will be using and the solution they are diluted with are sulfite free. The prescribed meds are:

Imipenem Cilastatin Sodium injection (IV)

Amikacin Sulfate injection (IV)

Lidocaine is preserved with sulfites... so if this is the diluting solution... there's a big problem.