ZypAdhera ® (olanzapine pamoate monohydrate)

ZypAdhera® (olanzapine pamoate): Half-life and Elimination

The half-life of olanzapine after olanzapine pamoate is 30 days compared to 30 hours following oral administration. the absorption and elimination are complete approximately six to eight months after the last injection.

Label Information

After a single intramuscular injection with olanzapine pamoate, the slow dissolution of the olanzapine pamoate salt in muscle tissue begins immediately and provides a slow continuous release of olanzapine for more than four weeks.1

The release becomes diminishingly smaller within eight to twelve weeks.1

The absorption and elimination are complete approximately six to eight months after the last injection.1

The combination of the release profile and the dosage regimen (intramuscular injection every two or four weeks) result in sustained olanzapine plasma concentrations. Plasma concentrations remain measurable for several months after each olanzapine pamoate injection.1

Olanzapine plasma clearance after oral olanzapine is lower in females (18.9 l/hr) versus males (27.3 l/hr), and in non-smokers (18.6 l/hr) versus smokers (27.7 l/hr). Similar pharmacokinetic differences between males and females and smokers and non-smokers were observed in olanzapine pamoate clinical trials. However, the magnitude of the impact of gender, or smoking on olanzapine clearance is small in comparison to the overall variability between individuals.1

For full information please refer to summary of product characteristics.


1. ZypAdhera [summary of product characteristics]. Eli Lilly Nederland B.V., The Netherlands.

Date of Last Review: April 12, 2021

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