We are traveling, my son has diarrhea and losing weight, on anti-malaria pills?

Hello this is a question about my 18 month old son, we are currently in Zanzibar and have been here for just over 2 weeks now and since before we came he has on and off Diarrhea today though he has had two lots of very water Diarrhea and I don’t know what to do! He’s fine in him self and is still eating but I feel like he is loosing weight. He has a dairy and sesame allergie but I do not give these to my son, he is currently on paediatric Malrone Anti malaria tablets.

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