Drug interactions
Budesonide + Saquinavir
Severity: Major
Budesonide and Saquinavir: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Ritonavir-boosted saquinavir strongly inhibits CYP3A4 and can greatly increase budesonide exposure. Cushing syndrome and adrenal suppression have been reported with boosted HIV protease inhibitors and budesonide.
What this interaction means in plain words
Budesonide and Saquinavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Saquinavir (usually with ritonavir) inhibits CYP3A4, reducing budesonide clearance.
What to do
Avoid long-term combination; consider beclomethasone or another steroid less dependent on CYP3A4. If unavoidable, monitor for Cushingoid features and adrenal suppression.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Budesonide
Frequently asked questions
Can I take Budesonide with Saquinavir?
MediHelp rates the interaction as major. Budesonide and Saquinavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Ritonavir-boosted saquinavir strongly inhibits CYP3A4 and can greatly increase budesonide exposure. Cushing syndrome and adrenal suppression have been reported with boosted HIV protease inhibitors and budesonide.
How serious is the interaction between Budesonide and Saquinavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid long-term combination; consider beclomethasone or another steroid less dependent on CYP3A4. If unavoidable, monitor for Cushingoid features and adrenal suppression.
What other medicines interact with Budesonide?
MediHelp also lists interactions of Budesonide with, for example, Aldesleukin, Atazanavir, Bcg vaccine live. The full list is on the Budesonide page.
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