Dimethyl sulfoxide.
21 C.F.R. § 524.660
in effectEffective: 2024-07-01(a) Specifications. (1) Each milliliter (mL) of solution contains 90 percent dimethyl sulfoxide and 10 percent water.
(2) Each milliliter (mL) of gel product contains 90 percent dimethyl sulfoxide.
(b) Sponsor. See No. 054771 in § 510.600(c) of this chapter.
(c) Conditions of use in horses and dogs—(1) Amount—(i) Horses. Apply topically two to three times daily in an amount not to exceed 100 mL per day. Total duration of therapy should not exceed 30 days.
(ii) Dogs. Apply topically three to four times daily in an amount not to exceed 20 mL per day. Total duration of therapy should not exceed 14 days.
(2) Indications for use. To reduce acute swelling due to trauma.
(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.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026