Nirmatrelvir and ritonavir and Paroxetine interaction
Nirmatrelvir and ritonavir and Paroxetine: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Nirmatrelvir and ritonavir (Paxlovid) label · effective 2026-02-19
Antidepressants bupropion ↓ bupropion and active metabolite hydroxy-bupropion Monitor for an adequate clinical response to bupropion. trazodone ↑ trazodone Adverse reactions of nausea, dizziness, hypotension, and syncope have been observed following co-administration of trazodone and ritonavir.
Potential for PAXLOVID to Affect Other Drugs PAXLOVID (nirmatrelvir co-packaged with ritonavir) is a strong inhibitor of CYP3A, and an inhibitor of CYP2D6, P-gp and OATP1B1.
From the Paroxetine (BRISDELLE) label · effective 2025-04-28
Table 3 Effects of Other Drugs on Paroxetine Concomitant Drug Name Effect of Concomitant Drug on Paroxetine Clinical Recommendations Phenobarbital Decreased paroxetine exposure Phenytoin Decreased paroxetine exposure Fosamprenavir/Ritonavir Decreased plasma concentration of paroxetine Monitor clinical effect of BRISDELLE.
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.