The interaction is not well understood and the data is ambiguous.
Antacids slow down absorption.
Kolestiramin reduces the concentration in the plasma.
Reduces (mutually) or does not change the effect of rifampicin, some beta-lactams against a number of strains.
Glycopeptides, fluoroquinolones reduce (mutually) the effect.
With benzylpenicillin, it gives a synergistic effect on penicillinase-forming staphylococci and additive for benzylpenicillin susceptible. When combined with macrolides, a pronounced synergistic effect is also observed; with tetracycline, streptomycin and chloramphenicol most often - additive effect.