Section 520.540a - Dexamethasone powder(a)Specifications. Each packet contains 10 milligrams (mg) of dexamethasone.(b)Sponsor. See No. 000061 in § 510.600(c) of this chapter.(c)Conditions of use in cattle and horses - (1)Amount. Administer 5 to 10 mg per animal the first day then 5 mg per day as required by drench or by sprinkling on a small amount of feed.(2)Indications for use. As supportive therapy following parenteral steroid administration for management or inflammatory conditions such as acute arthritic lameness, and for various stress conditions where corticosteroids are required while the animal is being treated for a specific condition.(3)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Do not use in horses intended for human consumption. 79 FR 28819 , May 20, 2014