Isoniazid and Rizatriptan interaction
Isoniazid and Rizatriptan: the Rizatriptan prescribing label flags 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 Rizatriptan (MAXALT) label · effective 2026-01-29
Monoamine Oxidase Inhibitors MAXALT is contraindicated in patients taking MAO-A inhibitors and non-selective MAO inhibitors.
Plasma concentrations of rizatriptan may be increased by drugs that are selective MAO-A inhibitors (e.g., moclobemide) or nonselective MAO inhibitors [type A and B] (e.g., isocarboxazid, phenelzine, tranylcypromine, and pargyline).
Serotonin Syndrome Serotonin syndrome may occur with triptans, including MAXALT particularly during co-administration with selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), and MAO inhibitors [see Drug Interactions (7.5) ] .
Drug Interactions [See also Drug Interactions (7) .] Monoamine oxidase inhibitors : Rizatriptan is principally metabolized via monoamine oxidase, 'A' subtype (MAO-A).
The interaction would be expected to be greater with irreversible MAO inhibitors.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
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.