Clozapine Dose Range

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Dosing up to but not exceeding 900mg day has been used for exceptional cases only.

Clozapine dose range.

To assess the effect of changes in smoking habit tobacco and cannabis on clozapine. To assess compliance plasma clozapine and norclozapine in the expected range only guarantees adherence over the previous few days. His clozapine level is 100 ng ml ie low range and his norclozapine level is 50 ng ml. Clozapine dosage modification may be required if coadministered with drugs that inhibit or induce metabolism of clozapine eg cyp 1a2 2d6 and 3a4 inhibitors qt prolongation.

Most agree that clozapine levels provide the most value while others suggest norclozapine levels should also be considered. Monitor for decreased effectiveness when discontinuing a strong cyp450 3a4 inducer and continuing clozapine. Understanding plasma clozapine and norclozapine measurement can be helpful. If you double the dose you double the level.

The maximum dose is 900 mg per day. If you halve the dose you halve the level. Doses 450 mg increase the possibility of side effects and adverse events including seizures. Concomitant use of clozapine is not recommended however if a strong cyp450 3a4 inducer is necessary a dose increase of clozapine dose may be needed.

Patients and their carers should be advised to seek immediate medical advice before taking the next dose of clozapine if constipation develops. Clozapine has been associated with varying degrees of impairment of intestinal peristalsis see cautions and contra indications for further information. Clozapine page 14 therapeutic dose range of clozapine usual dosage range is 200 450 mg day divided dose. The mean elimination half life of clozapine after a single 75 mg dose was 8 hours range.

If well tolerated the dose can be increased gradually typically by 12 5 to 25 mg every one to two days with the target dose and frequency determined by the plasma clozapine level and adverse effects. The total daily dose can be increased in increments of 25 mg to 50 mg per day if well tolerated to achieve a target dose of 300 mg to 450 mg per day administered in divided doses by the end of 2 weeks. For example consider the case of a schizophrenia patient who remains psychotic despite a clozapine dose of 200 mg bid 400 mg d. A clozapine plasma level can be checked after an initial target dose is reached generally after two weeks in the inpatient setting.

4 66 hours after achieving steady state with 100mg twice daily dosing. Recommended maximum daily dose is 600mg. If a clozapine level is high check the patient for dose related side effects. When interpreting blood levels low clozapine levels can result from low dose non adherence or rapid metabolism.

Clozapine associated with qt prolongation. For dose optimisation. Clozapine is a substrate for many cytochrome p450 isozymes in particular cyp1a2 cyp2d6 and cyp3a4.

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Rediscovering Clozapine Clinically Relevant Off Label Uses Current Psychiatry Labels Psychiatry Psychotic Disorders

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