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Can I take 2.5 and Pelargonium sidoides together?

Drug interaction guide

Taking Pelargonium sidoides (also known as Kaloba or Umckaloabo) alongside warfarin (2.5mg) may increase your risk of bruising or bleeding. This is because the herbal supplement may have mild blood-thinning properties that add to the effects of your prescription medication.

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Why this happens

Warfarin works by slowing down the body's ability to form blood clots. Pelargonium sidoides contains natural compounds called coumarins. While these are not exactly the same as warfarin, they may have a similar effect on the blood, potentially making the blood 'too thin' when the two are taken together.

You should avoid taking Pelargonium sidoides while you are on warfarin unless specifically told to do so by your doctor. If you have already taken them together, watch for signs of unusual bleeding, such as nosebleeds, bleeding gums, unexplained bruising, or dark/tarry stools. You may need an extra blood test (INR test) to check how quickly your blood is clotting.

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Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.

Article history

The information on this page is written and peer reviewed by qualified clinicians.

  • 14 Mar 2026 | Originally published
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