Section 520.1341 - Megestrol(a)Specifications. Each tablet contains 5 or 20 milligrams of megestrol acetate.(b)Sponsor. See No. 000061 in § 510.600(c) of this chapter.(c)Conditions of use in dogs - (1)Amount. Administer orally, intact, or crushed and mixed with food as follows: (i) For the postponement of estrus by proestrus treatment: 1 milligram per pound of body weight per day for 8 days.(ii) For the postponement of estrus by anestrus treatment: 0.25 milligram per pound of body weight per day for 32 days.(iii) For alleviation of false pregnancy: 1 milligram per pound of body weight per day for 8 days.(2)Indications for use. For the postponement of estrus and the alleviation of false pregnancy in female dogs.(3)Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian.40 FR 13838, Mar. 27, 1975, as amended at 52 FR 7832, Mar. 13, 1987; 78 FR 28824 , May 20, 2014