Section 520.1468 - Naproxen(a)Specifications. Each gram of granules contains 500 milligrams (mg) (50 percent) naproxen.(b)Sponsor. See No. 054771 in § 510.600(c) of this chapter.(c)Conditions of use in horses - (1)Amount. 10 mg per kilogram of body weight twice daily top dressed on feed for up to 14 consecutive days.(2)Indications for use. For the relief of inflammation and associated pain and lameness exhibited with arthritis, as well as myositis and other soft tissue diseases of the musculoskeletal system.(3)Limitations. Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian. 78 FR 28825 , May 20, 2014