Drug interactions
Norethisterone + Siltuximab
Severity: Minor
Norethisterone and Siltuximab: minor 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
Blocking IL-6 with siltuximab may restore suppressed CYP450 activity, which could lower exposure to CYP3A4 substrates such as norethisterone. The effect is theoretical for this drug and is likely small.
What this interaction means in plain words
Norethisterone and Siltuximab have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Norethisterone belongs to Endocrine; Siltuximab belongs to Miscellaneous.
Why it happens
Siltuximab neutralises IL-6, reversing cytokine-mediated downregulation of CYP enzymes and possibly increasing norethisterone clearance.
What to do
No routine change is needed; consider additional contraception if contraceptive reliability is critical and monitor for breakthrough bleeding.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Norethisterone and Siltuximab, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Norethisterone
- Acitretin + Norethisterone Contraindicated
- Amobarbital + Norethisterone Major
- Apalutamide + Norethisterone Major
- Belzutifan + Norethisterone Major
- Bosentan + Norethisterone Major
- Brigatinib + Norethisterone Major
Other interactions of Siltuximab
- Baricitinib + Siltuximab Major
- Atorvastatin + Siltuximab Moderate
- Carbamazepine + Siltuximab Moderate
- Cyclosporin + Siltuximab Moderate
- Ethinyl estradiol-drospirenone + Siltuximab Moderate
- Ethinyl estradiol-levonorgestrel + Siltuximab Moderate
Frequently asked questions
Can I take Norethisterone with Siltuximab?
MediHelp rates the interaction as minor. Norethisterone and Siltuximab have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Blocking IL-6 with siltuximab may restore suppressed CYP450 activity, which could lower exposure to CYP3A4 substrates such as norethisterone. The effect is theoretical for this drug and is likely small.
How serious is the interaction between Norethisterone and Siltuximab?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine change is needed; consider additional contraception if contraceptive reliability is critical and monitor for breakthrough bleeding.
What other medicines interact with Norethisterone?
MediHelp also lists interactions of Norethisterone with, for example, Acitretin, Amobarbital, Apalutamide. The full list is on the Norethisterone page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
