Examples
ampicillin
amoxicillin
Mech of Action
Bactericidal
interferes with cell wall by interfering with peptoglycan
allows accumulation of enzyme that destroys integrity of cell wall
USE
bactericidal against pneumococcal, meningococcal, streptococcal
ampicillin has wider range of activity, includes gram - bacilli (H flu, E coli) but has increased incidence of skin rash
metabolism/excretion
90% renal excretion
amoxicillin better absorbed by GI tract
side effects
hypersensitivity, most allergenic of all antimicrobials
rash, fever, anaphylactic, hemolytic anemia