Question: what are the possible side effects of amoxicillin?
Answer: diarrhoea (possibly with stomach cramps) that contains blood or mucus. ... 
pale poo with dark pee, yellowing of the skin or the whites of your eyes (warning signs of liver or gallbladder problems)
bruising or skin discolouration.
joint or muscle pain that comes on after 2 days of taking the medicine.