Abstract
Gentamicin was measured in the presence of clindamycin by using as the assay organism a strain of Staphylococcus aureus that was resistant to clindamycin; clindamycin was measured in the presence of gentamicin by using Clostridium perfringens as the assay organism. Both assays were in agar diffusion systems, were rapid (2 to 4 h), and had errors of less than 10%. Neither antibiotic antagonized or synergized with the other against a variety of organisms. The pK of clindamycin was 7.3, and the pK of gentamicin was 8.2. Gentamicin was 100 or more times as active in alkaline medium against both gram-positive and gram-negative organisms, but clindamycin showed a striking pH effect on activity only with gram-positive organisms.
Original language | Undefined/Unknown |
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Pages (from-to) | 54-59 |
Number of pages | 6 |
Journal | Antimicrobial Agents and Chemotherapy |
Volume | 6 |
Issue number | 1 |
State | Published - 1974 |
Keywords
- Anti-Bacterial Agents/pd [Pharmacology]
- Clindamycin/pd [Pharmacology]
- Clostridium perfringens/de [Drug Effects]
- Drug Therapy, Combination/pd [Pharmacology]
- Gentamicins/pd [Pharmacology]
- Hydrogen-Ion Concentration
- Microbial Sensitivity Tests