Occasionally, the question of the compatibility of CS with antibiotics comes 
up. Here is a study that shows that CS increases the bactericidal efficiency of 
amoxicillin


Synergistic antibacterial effects of β-lactam antibiotic combined with silver 
nanoparticles
http://www.iop.org/EJ/abstract/0957-4484/16/9/082

"When amoxicillin and silver nanoparticles are combined, it results in greater 
bactericidal efficiency on Escherichia coli cells than when they were applied 
separately. Dynamic tests on bacterial growth indicated that exponential and 
stationary phases are greatly decreased and delayed in the synergistic effect 
of amoxicillin and silver nanoparticles. In addition, the effect induced by a 
preincubation with silver nanoparticles is examined. The results show that 
solutions with more silver nanoparticles have better antimicrobial effects."

-       Steve N