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“With other antibiotics, 10 mM NAC had no major effects, while 50 mM NAC sporadically decreased (ceftriaxone and aminoglycosides) or increased ( penicillins ) antibiotic activity.”
Antimicrobial Agents and Chemotherapy • 2016 | View Paper
“ Acetylcysteine seems to be rapidly inactivated by high concentrations of oxygen and itself probably antagonises some penicillins and tetracyclines in sputum.2 The makers now recommend that compressed air, and not oxygen, should be used for nebulisation.”