Spectrum of Antibiotic Activity Relates to the number of microbes that are susceptible to the action of the drug Narrow(limited number)vs Broad (wide) Penicillin G is a narrow spectrum drug only effective against G+ bacteria etracyclines are broad spectrum drug effective against both gram-positive and G- bacteria Note: Never confusion these terms with potency levels of the drugs or efficacy (Narrow are weak, Broad are strong ?)Spectrum of Antibiotic Activity • Relates to the number of microbes that are susceptible to the action of the drug Narrow (limited number) vs Broad (wide) • Penicillin G is a narrow spectrum drug -only effective against G+ bacteria Tetracyclines are broad spectrum drug - effective against both gram-positive and G- bacteria Note: Never confusion these terms with potency levels of the drugs or efficacy (Narrow are weak, Broad are strong?)