(Boehringer Ingelheim) Hetacin-K (hetacillin potassium) Intramammary Infusion is for the treatment of acute, chronic, or subclinical bovine mastitis. Hetacin-K should be used at the first signs of inflammation or at the first indication of any alteration in the milk. Hetacillin potassium is a broad-spectrum agent which provides bactericidal activity against a wide range of common gram-positive and gram-negative bacteria. Each 10 ml disposable syringe contains hetacillin potassium equivalent to 62.5 mg ampicillin activity in a stable peanut oil gel. Infuse the entire contents of one syringe (10 ml) into each infected quarter. Repeat at 24-hour intervals until a maximum of three treatments has been given. If definite improvement is not noted within 48 hours after the treatment, the causal organism should be further investigated. Ampicillin.