Drug interactions
Clonidine + Olanzapine
Severity: Moderate
Clonidine 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
Both drugs can lower blood pressure and cause sedation, so used together they may cause orthostatic hypotension, dizziness and excess drowsiness. Falls are a particular concern in older patients.
What this interaction means in plain words
Clonidine 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.
Clonidine belongs to Cardiovascular; Olanzapine belongs to Central Nervous System.
Why it happens
Additive hypotensive and sedative effects from central alpha-2 agonism and olanzapine's alpha-1 blockade and CNS depression.
What to do
Monitor blood pressure including standing readings and sedation, particularly at initiation or dose increases. Reduce the dose of one drug if symptomatic.
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 Clonidine
- Acebutolol + Clonidine Major
- Amifostine + Clonidine Major
- Amiodarone + Clonidine Major
- Amoxapine + Clonidine Major
- Atenolol-chlorthalidone + Clonidine Major
- Atenolol + Clonidine Major
Other interactions of Olanzapine
Frequently asked questions
Can I take Clonidine with Olanzapine?
MediHelp rates the interaction as moderate. Clonidine 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. Both drugs can lower blood pressure and cause sedation, so used together they may cause orthostatic hypotension, dizziness and excess drowsiness. Falls are a particular concern in older patients.
How serious is the interaction between Clonidine 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 pressure including standing readings and sedation, particularly at initiation or dose increases. Reduce the dose of one drug if symptomatic.
What other medicines interact with Clonidine?
MediHelp also lists interactions of Clonidine with, for example, Acebutolol, Amifostine, Amiodarone. The full list is on the Clonidine page.
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