Ritonavir and Tamsulosin: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Ritonavir and Tamsulosin unless specifically directed by your doctor.
How Ritonavir interacts with Tamsulosin
Ritonavir potently inhibits CYP3A4 and CYP2D6, dual pathways for tamsulosin metabolism, increasing exposure markedly and risking severe hypotension.
What you should do
Avoid combination. If alpha-blocker required, use alfuzosin or silodosin with caution and close blood pressure monitoring.
Key facts
Severity
Major — avoid combination
Mechanism
Ritonavir potently inhibits CYP3A4 and CYP2D6, dual pathways for tamsulosin metabolism, increasing exposure markedly and...
Action
Avoid combination. If alpha-blocker required, use alfuzosin or silodosin with caution and close blood pressure monitorin...
Frequently asked questions
Can I take Ritonavir and Tamsulosin together?
No — this combination should generally be avoided. Avoid combination. If alpha-blocker required, use alfuzosin or silodosin with caution and close blood pressure monitoring.
What is the severity of this interaction?
The interaction between Ritonavir and Tamsulosin is classified as Major — avoid combination. Ritonavir potently inhibits CYP3A4 and CYP2D6, dual pathways for tamsulosin metabolism, increasing exposure markedly and risking severe hypotension.
What should I do if I'm prescribed both?
Avoid combination. If alpha-blocker required, use alfuzosin or silodosin with caution and close blood pressure monitoring. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.