Drug interactions
Saquinavir + Temsirolimus
Severity: Major
Saquinavir and Temsirolimus: major interaction.
Last updated
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
Saquinavir, a strong CYP3A4 inhibitor boosted with ritonavir, can raise exposure to temsirolimus and its active metabolite sirolimus. This may increase mTOR-related toxicities such as mucositis, cytopenias, hyperglycemia, pneumonitis and infection.
What this interaction means in plain words
Saquinavir and Temsirolimus 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
Inhibition of CYP3A4-mediated metabolism of temsirolimus and sirolimus.
What to do
Avoid strong CYP3A4 inhibitors where possible and choose an alternative antiretroviral. If unavoidable, labeling suggests reducing the temsirolimus dose and monitoring closely for toxicity.
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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Other interactions of Temsirolimus
- Bcg vaccine live + Temsirolimus Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Temsirolimus Contraindicated
- Measles mumps and rubella vaccine live + Temsirolimus Contraindicated
- Measles mumps rubella and varicella vaccine live + Temsirolimus Contraindicated
- Measles vaccine + Temsirolimus Contraindicated
- Rotavirus oral vaccine live + Temsirolimus Contraindicated
Frequently asked questions
Can I take Saquinavir with Temsirolimus?
MediHelp rates the interaction as major. Saquinavir and Temsirolimus 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. Saquinavir, a strong CYP3A4 inhibitor boosted with ritonavir, can raise exposure to temsirolimus and its active metabolite sirolimus. This may increase mTOR-related toxicities such as mucositis, cytopenias, hyperglycemia, pneumonitis and infection.
How serious is the interaction between Saquinavir and Temsirolimus?
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 strong CYP3A4 inhibitors where possible and choose an alternative antiretroviral. If unavoidable, labeling suggests reducing the temsirolimus dose and monitoring closely for toxicity.
What other medicines interact with Temsirolimus?
MediHelp also lists interactions of Temsirolimus with, for example, Bcg vaccine live, Influenza virus vaccine quadrivalent intranasal, Measles mumps and rubella vaccine live. The full list is on the Temsirolimus page.
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