<p>Myelosuppression may be aggravated with concomitant use of myelosuppressants. Clozapine may interact with other CNS active drugs or alcohol. Orthostatic hypotension may occur with benzodiazepine usage or other psychotropics. Since Clozapine is highly bound to proteins. It may be displaced by other drugs, which are also highly protein bound. Conversely, Clozapine may also displace protein bound drugs (e.g. warfarin, digoxin). Cimetidine may decrease plasma Clozapine levels.<br />
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Although concomitant administration of Carbamazepine and Clozapine is not recommended, it should be noted that discontinuation of concomitant Carbamazepine may result in an increase in plasma Clozapine levels. A reduced Clozapine dosage should be used when it is combined with drugs like fluvoxamine, paroxetine and sertraline. The action of hypotensive drugs may be potentiated. Other anticholinergic drug action may also be increased. Administration of adrenaline should generally be avoided due to possibility of reversal of adrenaline effect due to alpha adrenergic blockade by Clozapine. Concomitant use of Clozapine with other drugs metabolized by cytochrome P450 2D6 (such as phenothiazines, antidepressants, propafenone, flecainide and encainide) or those that inhibit this enzyme such as quinidine; require lower doses of either Clozapine or the other drugs.</p>