There are many forms of penicillin, so dosages vary greatly. Always check with your veterinarian regarding the use and dosage of penicillin in your pet. Inadequate doses or treatment periods, or overdosage, can cause significant problems. Pen-V Type of Drug Class of penicillin antibiotic. Shake well before use.
Some manufacturers recommend warming to room temperature before use.
Oral forms should be protected from moisture and stored at room temperature. 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.