Mastitis Treatment

Lactating cattle

MASTI-CLEAR® (penicillin in oil) delivers proven control against udder infections in lactating cattle caused by Streptococcus agalactiae, Streptococcus dysgalactiae, and Streptococcus uberis.

Ordering Information

To order MASTI-CLEAR® or other animal health products, contact your wholesaler, one of the veterinary suppliers listed, or call the US VETTM customer service department at 1-833-551-0306.

Product NDC# Indications Composition Quantity Package Insert
Lactating Cows: Treatment of Streptococcus agalactiae, Streptococcus dysgalactiae, and Streptococcus uberis infections Penicillin G procaine, 100,000 units, sesame oil 8.7 gram, calcium carbonate 0.089 gram, corn starch 0.089 gram, hydrogenated castor oil 0.044 gram Carton: 12 x 10-mL syringes with 12 single-use alcohol pads PDF

MASTI-CLEAR® Suspension Safety Information


Intramammary use for the treatment of bovine mastitis in lactating cows. MASTI-CLEAR® is effective against udder infections caused by the following susceptible microorganisms: Streptococcus agalactiaeStreptococcus dysgalactiae, and Streptococcus uberis.


Discard all milk for 60 hours (5 milkings) after the latest treatment. Animals intended for human consumption must not be slaughtered within 3 days of the last treatment with MASTI-CLEAR®. Use of this product in a manner other than as directed in the labeling might result in violative residues. It is a violation of federal law to use MASTI-CLEAR® in food-producing animals other than as directed in the labeling.


Each 10 milliliters of suspension contains 100,000 units of penicillin G procaine.