Try fresh juices, soups and other forms of liquids.
If he can have semi solids, then rice porridge with a pinch of salt and
sugar
Try to avoid mefenemic acid.
Take plain paracetamol.
If you specify his age, weight and other details related to stools, can help you better with resolving the issue.
Book an appointment with me to discuss further.
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for more helpful tips !
Take care !