Behaiour effects of medroxiprogestrone on spayed female cat

my female cat were spayed at 6 months ago but she show heated behaviour during this months and also urinating some days on my bed . my vet injected medroxiprogesterone last week . but she become aggressive with my other cat in spite of they had very friendly communication before but she dose not play with her after take this medicine . now please tell me why and what should I do .
Asked Feb 03, 2014

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.