I took zyprexa for over 6 years, the initial dose was 20mg, I did not suffer from any of the side effects... luckily!
It does cause high blood sugar, which is a serious side effect which must be reported to your Doctor ASAP.
This is one the many reasons zyprexa should be monitored closely, and of course regular blood test to check sugar levels. And in some cases if the HBS ( high blood sugar) is to high it can lead to coma, or death.
This is in an article I read somtime ago.
The drug can be helpful to prevent suicides, though it has been observed that the use of zyprexa will sometimes instead trigger suicidal thoughts.
I hope I have been of some help to you.