Drug interactions
Carbamazepine + Saquinavir
Severity: Major
Carbamazepine 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
Carbamazepine can substantially lower saquinavir levels, risking virologic failure and resistance. When saquinavir is boosted with ritonavir, CYP3A4 inhibition may also raise carbamazepine concentrations.
What this interaction means in plain words
Carbamazepine 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
Carbamazepine induces CYP3A4 and P-glycoprotein, increasing saquinavir clearance.
What to do
Avoid the combination and use a non-inducing anticonvulsant. If unavoidable, monitor HIV viral load and carbamazepine concentrations.
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 Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Saquinavir?
MediHelp rates the interaction as major. Carbamazepine 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. Carbamazepine can substantially lower saquinavir levels, risking virologic failure and resistance. When saquinavir is boosted with ritonavir, CYP3A4 inhibition may also raise carbamazepine concentrations.
How serious is the interaction between Carbamazepine 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 the combination and use a non-inducing anticonvulsant. If unavoidable, monitor HIV viral load and carbamazepine concentrations.
What other medicines interact with Carbamazepine?
MediHelp also lists interactions of Carbamazepine with, for example, Artemether / lumefantrine, Cabotegravir, Delamanid. The full list is on the Carbamazepine page.
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