I've never been on an atypical anti-psychotic for my OCD, and thus, I've never taken clozapine. Out of all of the atypical anti-psychotics, clozapine is one of the strongest serotonin antagonists. The atypical anti-psychotics work both as a dopamine antagonist and a serotonin antagonist, and recent studies have linked OCD as possibly resulting from abnormally high amounts of dopamine (like schizophrenia), and that is why the atypical anti-psychotics are now a secondary means of treatment (if the SSRIs fail). OCD also is strongly thought to be related to low amounts of serotonin, hence, why the SSRIs are often effective. Some OCD-ers do very well on an atypical anti-psychotic alone, but for some, the fact that it's a serotonin antagonist actually worsens symptoms, since it's decreasing the amount of serotonin (and the serotonin is already low in OCD-ers' brains).

Being one of the strongest serotonin antagonists, clozapine has more of a risk, when taken alone, of worsening OCD symptoms than other atypical anti-psychotics. You may not be affected at all by this, but you may want to talk to your doctor about taking it with an SSRI. In some OCD patients, adding an atypical anti-psychotic to a current SSRI treatment program works wonders, because the anti-psychotic works on the dopamine, and the SSRI works on the serotonin (while counteracting the serotonin antagonistic effects of the atypical anti-psychotic). Hope this helped, and if you have any questions, feel free to ask!
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