If you don't mind me asking, since you sound familiar with the drug, is there a chance that the drug would not work at all on some patients? What if the sedation does not seem to take affect at all? On some previous studies, there should be signs of improvement within a 6 weeks or so. However, if this is not the case, what other medication do you personally think is better?
I believe I can answer this since I'm not answering it specific to an individual, and in generalities (moderators correct me if I'm wrong).
All meds, despite their typical presentations can have better, worse or atypical presentations depending on the individual. E.g. Zyprexa which causes tremendous weight gain in several patients, even more so than quietapine, in several does not.
Here is an algorithm for antipsychotics...
http://www.medscape.com/content/2003/00/45/89/458907/458907_fig.html
If you want to get more specific than that, I suggest you read up on the CATIE trial. It has very specific side effects for each atypical antipsychotic minus Abilify.
http://content.nejm.org/cgi/content/abstract/353/12/1209
More specific than that, a doctor needs to incorporate the pros & cons of every medication available to treat the disorder, and factor in the patient's own profile (age, sex, weight, medical problems, health status, lifestyle, symptom profile, etc) vs the benefits & risks of each medication. E.g. quietapine in the CATIE trial cause the most amount of QT prolongation, Clozaril, Zyprexa & Seroquel caused the most amount of weight gain & increase in lipid profile, Risperdal caused the most amount of prolactin increase....yada yada yada.
From the above paragraph on--it really has to be determined by the treating doctor. I can only speak in generalities, the treating doctor has to judge for his/her individual patient.