Phenelzine and Ziprasidone interaction
Phenelzine and Ziprasidone: 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 Phenelzine (phenelzine sulfate) label · effective 2026-05-21
Phenelzine sulfate should not be used in combination with dextromethorphan or with CNS depressants such as alcohol and certain narcotics.
From the Ziprasidone (Geodon) label · effective 2025-01-13
• Concomitant use of monoamine oxidase inhibitors (MAOIs), or use within 14 days of stopping MAOIs.
Monoamine Oxidase Inhibitors (MAOIs) Ziprasidone is contraindicated in patients taking, or within 14 days of stopping, MAOIs (including the MAOIs linezolid and intravenous methylene blue) because of an increased risk of serotonin syndrome [see Warnings and Precautions (5.4) , Drug Interaction (7.3) ] .
• Serotonin Syndrome: Increased risk when co-administered with other serotonergic agents, but also when taken alone.
The concomitant use of GEODON with MAOIs is contraindicated.
If concomitant use of GEODON with other serotonergic drugs is clinically warranted, inform patients of the increased risk of serotonin syndrome and monitor for symptoms .
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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.