Drug interactions
Insulin nph + Olanzapine
Severity: Moderate
Insulin nph and Olanzapine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Olanzapine can cause hyperglycemia and insulin resistance, which may offset the effect of NPH insulin. Diabetic patients may lose glycemic control and need higher insulin doses.
What this interaction means in plain words
Insulin nph and Olanzapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Olanzapine-induced insulin resistance and metabolic effects oppose insulin action.
What to do
Monitor blood glucose closely after starting or changing olanzapine and titrate NPH insulin as needed. Review HbA1c and weight regularly.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Olanzapine
Frequently asked questions
Can I take Insulin nph with Olanzapine?
MediHelp rates the interaction as moderate. Insulin nph and Olanzapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Olanzapine can cause hyperglycemia and insulin resistance, which may offset the effect of NPH insulin. Diabetic patients may lose glycemic control and need higher insulin doses.
How serious is the interaction between Insulin nph and Olanzapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose closely after starting or changing olanzapine and titrate NPH insulin as needed. Review HbA1c and weight regularly.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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