thanks for choosing health care magic.Dear this antibiotics
has nothing do with stool color.This could be due to some food that you have eaten or something else.Please take advice of your doctor if this persists.Black stool may due to some food substance or some minor bleeding
inside your GI tract which needs attention.Your doctor may ask you to go for stool test
and check for presence of blood
in it.take care .Avoid eating spicy and heavy meals.