Abemaciclib and Lanreotide: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 10, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Abemaciclib
Lanreotide
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here is what is going on. Your cancer medicine, abemaciclib (Verzenio), is broken down by a liver enzyme called CYP3A4. Lanreotide may slow that enzyme down a bit. If that happens, abemaciclib could build up in your body and cause stronger side effects, like diarrhea, tiredness, nausea, or low blood counts.
I want to be honest with you: this concern is mostly theoretical, meaning it is based on how the drugs work rather than lots of real-world cases. Please do not change anything on your own. Your care team can manage this easily by adjusting your dose if needed and keeping a closer eye on how you feel.
Mechanism/direction: Somatostatin analogs (lanreotide) may inhibit CYP3A4 secondary to growth hormone suppression. Abemaciclib is a CYP3A4 substrate (not a prodrug), so reduced clearance could increase abemaciclib exposure (AUC/Cmax) and dose-dependent toxicity.
- Evidence: Theoretical; magnitude not quantified.
- Onset: Unspecified.
- Toxicity to watch: Diarrhea, neutropenia, hepatotoxicity (ALT/AST), fatigue.
Management: Guidance advises avoiding lanreotide with low-therapeutic-index CYP3A4 substrates. If co-use is required, consider abemaciclib dose adjustment individualized to the patient and monitor CBC, LFTs, and clinical tolerability more closely.
What happens
Altered exposure to CYP3A4 substrate
Interaction Deep Dive
Lanreotide and other somatostatin analogs can suppress growth hormone, and through this mechanism they may reduce CYP enzyme activity. As a result, the plasma levels of drugs that serve as CYP3A4 substrates could be altered. Combining lanreotide with a CYP3A4 substrate that has a narrow therapeutic index should be avoided. When lanreotide must be given alongside a medication that undergoes hepatic metabolism as its main route of clearance, adjusting the dose of that substrate should be considered1.
Why it happens (mechanism)
Inhibition of metabolism of CYP3A4 substrate secondary to lanreotide suppression of growth hormone
How to manage this interaction
The good news: your care team can manage this. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your team may adjust your abemaciclib dose, individualized to you, if you use both drugs together.
- They may monitor you more closely, including bloodwork and how you are tolerating treatment.
- In some cases they may consider an alternative approach.
What you should do: tell your pharmacist or oncologist that you take both. Report worsening diarrhea, unusual tiredness, signs of infection, or nausea so they can act early.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abemaciclib and Lanreotide together?
Lanreotide may slow the breakdown of abemaciclib, potentially raising its levels and side effects, though this is theoretical. Do not change anything on your own; let your oncology team adjust the dose and monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abemaciclib and Lanreotide interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Abemaciclib and Lanreotide interaction managed?
The good news: your care team can manage this. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your team may adjust your abemaciclib dose, individualized to you, if you use both drugs together. They may monitor you more closely, including bloodwork and how you are tolerating treatment. In some cases they may consider an alternative approach. What you sh… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Abemaciclib or Lanreotide need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (1)
- Product Information: SOMATULINE(R) DEPOT subcutaneous injection, lanreotide subcutaneous injection. Ipsen Biopharmaceuticals Inc (per manufacturer), Basking Ridge, NJ, 2017. DailyMed
Keep reading about Abemaciclib
Keep reading about Lanreotide
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