Drug interactions
Methylphenidate + Warfarin
Severity: Minor
Methylphenidate and Warfarin: 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
Methylphenidate has been reported to increase the effect of coumarin anticoagulants in isolated cases. The interaction is poorly documented and unlikely to be common.
What this interaction means in plain words
Methylphenidate and Warfarin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Methylphenidate belongs to Central Nervous System; Warfarin belongs to Cardiovascular.
Why it happens
The mechanism is not established; possible inhibition of coumarin metabolism has been suggested.
What to do
Check INR when methylphenidate is started or stopped and adjust warfarin only if needed.
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?
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Other interactions of Warfarin
- Defibrotide + Warfarin Contraindicated
- Ketorolac + Warfarin Contraindicated
- Abciximab + Warfarin Major
- Acetylsalicylic acid + Warfarin Major
- Adagrasib + Warfarin Major
- Amiodarone + Warfarin Major
Other interactions of Methylphenidate
- Isocarboxazid + Methylphenidate Contraindicated
- Linezolid + Methylphenidate Contraindicated
- Methylphenidate + Phenelzine Contraindicated
- Methylphenidate + Procarbazine Contraindicated
- Methylphenidate + Rasagiline Contraindicated
- Methylphenidate + Safinamide Contraindicated
Frequently asked questions
Can I take Methylphenidate with Warfarin?
MediHelp rates the interaction as minor. Methylphenidate and Warfarin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Methylphenidate has been reported to increase the effect of coumarin anticoagulants in isolated cases. The interaction is poorly documented and unlikely to be common.
How serious is the interaction between Methylphenidate and Warfarin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check INR when methylphenidate is started or stopped and adjust warfarin only if needed.
What other medicines interact with Warfarin?
MediHelp also lists interactions of Warfarin with, for example, Defibrotide, Ketorolac, Abciximab. The full list is on the Warfarin page.
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