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Pharmacology
If a bacteria were susceptible to both penicillin and Erythromycin, then it would not be appropriate to treat the patients with both antibiotics at the same time because
Penicillin is inactivated by erythromycin
Erythromycin exerts its effects extracellularly
Erythromycin enhances the β-lactamases activity
Penicillin is only effective against growing cells
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