Spectramast DC - Prescription RequiredSpectramast DC Ceftiofur HCl sterile suspension for intramammary infusion in dry dairy cattle only. Each 10 mL PLASTET disposable syringe contains 500 mg ceftiofur equivalents as the hydrochloride salt. Dosage & Administration: Inject 1 tube into each affected quarter at the time of dry off. *This product requires a prescription from your veterinarian. They can submit it in a few different ways: Fax a prescription form to 515 573 5331 Call 515 573