Hi, I have not used this but a quick search in "Cancer Research UK " shows it can give diarrhoea - cancerresearchuk.org/about-...
The medicine pack should have leaflet from the manufacturer - you may want to read it (possible side effects), although most manufacturers will include almost all possible common side effects, so sometimes it is hard to make a judgement.
But, since it is a type of chemotherapy drug, this diarrhoea and stomach cramps easily occur as side effect. I hope you would not need to use it for long - but it is best to consult the doctor if the diarrhoea lasts for more than 3 days - and I am sure you know, you need to keep drinking lots of fluids - I am sorry to hear this and I hope you will feel better soon.
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