This scoping review in the British Journal of Clinical Pharmacology identified 48 studies, from 1990 to 2025, reporting adverse events when beta-blockers and SSRIs were used together in adults. Published on 7 October 2026.
Bradycardia was the commonest event (11 reports), mostly in case reports involving metoprolol with fluoxetine, paroxetine or sertraline, or propranolol with fluoxetine. Blood pressure changes, including hypotension, appeared in half the studies that measured them. Where a mechanism was proposed, it was usually inhibition of CYP2D6, which clears metoprolol, propranolol and carvedilol.
The combination is common, for anxiety with palpitations, or depression after a cardiac event. Fluoxetine and paroxetine are strong CYP2D6 inhibitors; sertraline is a weaker, dose-dependent one. Bisoprolol and atenolol are not mainly cleared by CYP2D6, and citalopram and escitalopram have less effect on it.
The evidence is weak, largely case reports, and the size of the risk is unknown. But choosing a combination that sidesteps the interaction costs nothing.
- Prefer bisoprolol or atenolol over metoprolol or propranolol when a patient takes fluoxetine or paroxetine
- Consider escitalopram or citalopram rather than fluoxetine or paroxetine in patients on metoprolol
- Check pulse and blood pressure after starting either drug when the combination is unavoidable
- Ask about dizziness, fatigue and falls in older patients on both
- Remember fluoxetine's inhibition lasts weeks after stopping, because of its long half-life
Why it matters
A common, often unremarked combination carries a predictable interaction that is easy to design out.
Don't overread it
Most evidence is case reports; the frequency and size of the risk are not known.
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