Atomoxetine and Methylene blue interaction

Atomoxetine and Methylene blue: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.

Major

Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.

What the FDA labels say

From the Atomoxetine (Atomoxetine hydrochloride) label · effective 2026-04-03

Major

Taking, or within 14 days of stopping, a monoamine oxidase inhibitor (MAOI) [see Drug Interactions (7) ] .

Contraindicationsby drug classView label on DailyMed
Major

Contraindicated in patients ( 4 ): With known hypersensitivity to atomoxetine oral solution or other components of atomoxetine oral solution Taking or within 14 days of stopping, a monoamine oxidase inhibitor (MAOI) With narrow angle glaucoma.

Contraindicationsby drug classView label on DailyMed
Major

Table 9: Clinically Significant Drug Interactions with Atomoxetine Oral Solution and Other Drugs​​​​​​​ Monoamine Oxidase Inhibitors (MAOIs) Prevention or Management Atomoxetine oral solution is contraindicated in patients taking MAOIs, including MAOIs such as linezolid or intravenous methylene blue, or in patients who stopped an MAOI within 14 days.

Drug interactionsby drug classView label on DailyMed
Major

Monoamine Oxidase Inhibitors: Concomitant use contraindicated.

Drug interactionsby drug classView label on DailyMed
Minor

Mechanism and Clinical Effect(s) As with other drugs affecting brain monoamine concentrations, there have been reports of serious, sometimes fatal reactions (hyperthermia, rigidity, myoclonus, autonomic instability with fluctuations of vital signs, extreme agitation progressing to delirium/coma) with concomitant use of atomoxetine oral solution and an MAOI.

Drug interactionsby drug classView label on DailyMed

From the Methylene blue (PROVAYBLUE) label · effective 2025-05-28

Major

Avoid concomitant use of PROVAYBLUE with selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors (MAOIs) and opioids. [see Warnings and Precautions ( 5.1 ) and Drug Interactions ( 7.1 )].

Boxed warningby drug classView label on DailyMed
Moderate

…use of PROVAYBLUE with medicinal products that enhance serotonergic transmission including antidepressants like SSRIs (selective serotonin reuptake inhibitors), SNRIs (serotonin and norepinephrine reuptake inhibitors), MAOIs (monoamine oxidase inhibitors), bupropion, buspirone, clomipramine, mirtazapine, linezolid, opioids, and dextromethorphan because of the potential…

Drug interactionsby drug classView label on DailyMed
Minor

Most reports have been associated with concomitant use of serotonergic drugs (e.g., selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors (MAOIs).

Warnings and precautionsby drug classView label on DailyMed

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Not 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.