MAJOR — Use With Caution
FDA-documented. Paroxetine is worst CYP2D6 inhibitor for this interaction. Start atomoxetine at low dose.
Evidence level: STRONG
Paxil causes the largest increase in atomoxetine (Strattera) levels of any SSRI because it is the strongest blocker of the enzyme that breaks down Strattera.
Paroxetine is the strongest CYP2D6 inhibitor among SSRIs. Atomoxetine is a CYP2D6 substrate. Significantly increased atomoxetine exposure. FDA atomoxetine label warns.
If prescribed both, start Strattera at a very low dose. Monitor blood pressure and heart rate carefully. Consider alternative SSRI with less CYP2D6 inhibition.
Take Paroxetine at the same time each day — morning is most common to avoid sleep disruption. Atomoxetine follows its prescribed schedule. SSRIs have a long half-life, so consistency matters more than the exact hour.
Higher risk for: elderly, those on multiple serotonergic drugs, people with liver impairment, CYP2D6 poor metabolizers, recent dose changes, or concurrent use of MAOIs or triptans.
Rapid heartbeat, high blood pressure, nausea, insomnia, mood instability
Use sertraline or escitalopram instead of paroxetine if possible. Start atomoxetine low and titrate slowly.
Discuss this combination with your prescriber. They may adjust timing, dosing, or switch to an alternative with fewer interaction risks. Never stop an antidepressant abruptly — taper under medical guidance.
Paxil causes the largest increase in atomoxetine (Strattera) levels of any SSRI because it is the strongest blocker of the enzyme that breaks down Strattera.
Take Paroxetine at the same time each day — morning is most common to avoid sleep disruption. Atomoxetine follows its prescribed schedule. SSRIs have a long half-life, so consistency matters more than the exact hour.
Rapid heartbeat, high blood pressure, nausea, insomnia, mood instability
Discuss this combination with your prescriber. They may adjust timing, dosing, or switch to an alternative with fewer interaction risks. Never stop an antidepressant abruptly — taper under medical guidance.
Use sertraline or escitalopram instead of paroxetine if possible. Start atomoxetine low and titrate slowly.
Or browse the full interaction database (121,000+ pairs).