Indications for Use Treatment of susceptible bacterial infections. Some formulations of Penicillin G are FDA approved for use in dogs. Several of the formulations of Penicillin G are commonly used in dogs and cats. None of the Penicillin V formulations are FDA approved for use in dogs or cats and are used less frequently. Available by prescription and over the counter .
Penicillins are bacteriocidal .
Not useful against penicillinase or beta-lactamase producing bacteria or most gram negative bacteria. Duration of treatment depends on reason for treatment and response to treatment, so give as directed by your veterinarian. Side Effects May see lack of appetite, drooling, vomiting, or diarrhea. In case of an allergic reaction, may also see rash, fever, changes in the blood cells, swollen lymph nodes , incoordination, increased heart rate, increased rate of breathing, difficulty breathing, or swelling of face or limbs. Not for use in patients hypersensitive to penicillins or beta-lactam antibiotics such as cephalosporins.