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It does take quite awhile, several weeks at least. The exact time depends on your size and your body chemistry.
Who prescribed you Zyprexa and what diagnosis is it for? I used to take Zyprexa so I'm a little biased but my advice is to be very careful with this stuff, it tends to overprescribed. Don't necessarily believe a psychiatrist who just tells you "you're sick and you must take this drug".
Zyprexa (olanzipine) is a strong 2nd generation antipsychotic (along with Seroquel, Clorazil and a few others). It is a heavy sedative and will most likely make you gain a fair bit of weight. I found that although it helped me sleep at night, I couldn't wake up properly in the morning and my brain felt slow and fuzzy most of the day. I also put on about 10-15kg. Drugs in this category can also cause low blood pressure, my flatmate used to pass out in the shower when she was on Seroquel.
In my opinion, you only need Zyprexa as an anti-manic drug, rather than a maintenance drug, however that is my personal experience and not a medical opinion.
Edit: Note "anti-psychotic, not "anti-depressant" or "mood-stabiliser". Its very effective on mania, works in a few days but I found it to have little effect on depressive swings, even making them worse sometimes.
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