Section 520.1372 - Methimazole(a)Specifications. Each tablet contains 2.5 or 5 milligrams (mg) methimazole.(b)Sponsor. See No. 043264 in § 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 levels and clinical response.(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