title: Adrenocortical suppression in the dog after a single dose of methylprednisolone acetate.
abstract: Adrenal function was assessed in dogs after intramuscular administration of a single dose of methylprednisolone acetate (MPA). Twelve dogs were test challenged with adrenocorticotropic hormone (ACTH) and then assigned randomly to 1 of 3 groups and given MPA. Individual groups were test challenged with ACTH 2, 3, or 4 weeks later. All dogs were rechallenged 5 weeks after MPA administration. Plasma cortisol concentration was determined by radioimmunoassay. Basal plasma cortisol (time 0) was depressed on weeks 2 and 3, but not on weeks 4 and 5. Adrenal response to ACTH (increment of cortisol change) was suppressed on weeks 2, 4, and 5, but not on week 3. It was concluded that a single dose of MPA is capable of altering adrenal cortical function in dogs for at least 5 weeks.
mesh_terms: D000302:Adrenal Cortex / Q000187:drug effects; D000304:Adrenal Cortex Function Tests; D000309:Adrenal Insufficiency / Q000139:chemically induced*; D000324:Adrenocorticotropic Hormone / Q000494:pharmacology; D000818:Animals; D004285:Dogs / Q000502:physiology*; D005260:Female; D006854:Hydrocortisone / Q000097:blood; D008297:Male; D008775:Methylprednisolone / Q000031:analogs & derivatives* / Q000494:pharmacology; D000077555:Methylprednisolone Acetate
chemical_list: D000077555:Methylprednisolone Acetate; D000324:Adrenocorticotropic Hormone; D006854:Hydrocortisone; D008775:Methylprednisolone