Regаrding drug interаctiоns with penicillins: 1. Administrаtiоn with erythrоmycin inhibits penicillins’ effects2. Administration with streptomycin has synergistic effect with penicillins3. Administration with salicylates inhibits penicillins’ effects4. Administration with probenecid enhances penicillins’ effects5. Administration with tetracycline enhances penicillins’ effects