Clonidine and Olanzapine and fluoxetine interaction
Clonidine and Olanzapine and fluoxetine: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Clonidine (QLONILIK) label · effective 2026-08-12
Avoid use with other central nervous system (CNS) depressants ( 5.3 )
Avoid use with other central nervous system (CNS) depressants, as this combination may cause excessive drowsiness or sedation [see Drug Interactions (7) ].
Intervention Avoid concomitant use of CNS depressants with QLONILIK.
Intervention Monitor blood pressure and heart rate, and adjust dosage of QLONILIK accordingly in patients treated concomitantly with antihypertensives CNS depressants Clinical Implication Concomitant use of CNS depressants with clonidine potentiates the sedating effects [see Warnings and Precautions (5.3) ].
Tricyclic antidepressants Clinical Implication Concomitant use of tricyclic antidepressants with clonidine can increase blood pressure and may counteract the hypotensive effects of clonidine.
From the Olanzapine and fluoxetine label · effective 2026-03-31
…and fluoxetine capsules should be used with particular caution in patients with known cardiovascular disease (history of myocardial infarction or ischemia, heart failure, or conduction abnormalities), cerebrovascular disease, or conditions that would predispose patients to hypotension (dehydration, hypovolemia, and treatment with antihypertensive medications).
Antihypertensive Agent : Enhanced antihypertensive effect ( 7.7 )
Antihypertensive Agents — Because of the potential for olanzapine to induce hypotension, olanzapine and fluoxetine capsules may enhance the effects of certain antihypertensive agents [see Warnings and Precautions ( 5.11 )] .
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.