After taking 20mg of prozac (fluoxetine) for 19 days can i just stop.doesnt agree with me..or do i have to wean off?

Prozac (fluoxetine): Don't stop the medication until you speak with your treating physician and tell them why it does not agree with you, they can discuss what needs to be done.

Talk to doc first: You should talk to your doctor first. Prozac (fluoxetine) hangs around in your bloodstream for days. Please do not stop it however until you've had a discussion regarding that with your prescribing physician. It could be side effects may just go away with time and you're already almost 3 weeks into treatment with this medication so i would try to be more patient with it and get in touch with your doctor the first chance you get.