§ 520.1375. Methimazole tablets.
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/us/cfr/t21/s§ 520.1375·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Specifications. Each tablet contains 2.5 or 5 milligrams
(mg)methimazole.
(b)Sponsors, See Nos. 043264 and 086101in § 510.600 of this chapter.
(c)Conditions of use in cats—(1) Amount. The starting dose is 2.5 mg every 12 hours. Following 3 weeks of treatment, the dose should be titrated to effect based on individual serum total T4
(TT4)levels and clinical response. Dose adjustments should be made in 2.5 mg increments. The maximum total dosage is 20 mg per day divided, not to exceed 10 mg as a single administration.
(2)Indications for use. For the treatment of hyperthyroidism.
(3)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian. [74 FR 27707, June 11, 2009. Redesignated and amended at 89 FR 95103, Dec. 2, 2024; 90 FR 40970, Aug. 22, 2025]