1. Ampicillin does not resist destruction by penicillinase

2. Ampicillin is penicillinase-susceptible penicillin and is the prototype drug while Amoxicillin is penicillinase-susceptible penicillin but is a synthetic analog of Ampicillin

3. The major classes of Antibiotics include: aminoglycosides, penicillins and penicillinase-resistant drugs, sulfonamides, tetracyclines, and antimycobacterials (e.g

4. For the treatment of subclinical mastitis in lactating cows due to Gram-positive cocci susceptible to pirlimycin including staphylococcal organisms such as Staphylococcus aureus, both penicillinase-positive and penicillinase-negative, and coagulase-negative staphylococci; streptococcal organisms including Streptococcus agalactiae, Streptococcus dysgalactiae and Streptococcus uberis

5. For the treatment of subclinical mastitis in lactating cows due to Gram-positive cocci susceptible to pirlimycin including staphylococcal organisms such as Staphylococcus aureus, both penicillinase-positive and penicillinase-negative, and coagulase-negative staphylococci; streptococcal organisms including Streptococcus agalactiae, Streptococcus dysgalactiae, and Streptococcus uberis

6. (Fosfonet Sodium Anhydrous, NCI Thesaurus) The Anhydrous form of the sodium salt of oxacillin, a semisynthetic penicillinase-resistant and acid-stable penicillin with antibacterial activity.