Further w/u for 20 yo obese female on fluoxetine 40 mg.am, respiridol 1.5 mg hs, cogentin (benztropine) 1 mg. with amenorrhea x 9 months?

Don't know: what the work up has consisted of so far -so it would be hard to make a recommendation. Take care.

Start: start with pregnancy test, TSH, prolactin. if negative pregnancy -- give provera (medroxyprogesterone) 10 mg q d x 10 days and expect a very heavy withdrawal bleed

Physical + Prolactin: You need to have a physical examination (i.e. go see your OB/GYN ASAP), however risperdal-induced hyperprolactinemia (or pituitary adenoma) would be the most straightforward explanation

See gyn,psychiatrist: I guess you may have some anxiety and depression ,for which you are taking fluoxetin ,resperidol and cogent in ,as your psychiatrist prescribed But for your obesity and amenorrhea , you better consult GYN doctor and get investigated ,to get proper treatment .