DS is 5 and was prescribed amoxicillin for a chest infection on Friday. The prescribing nurse warned it can upset the stomach sometimes. On Saturday night (whilst my mum was looking after him) he had very urgent diarrhoea which she had to wipe off the wall! 
By this morning he seems loads better but we kept him off school to avoid the humiliation of him pebble dashing the school toilets. However, this afternoon has been rather challenging with him feeling well but not able to get out, and his younger brother being too poorly to move far from the sofa.
So my question is, how long should I keep him off for? he's on the antibiotics until Friday.