Hello doctor, i have oily dark stools, its not loose motion just soft stools. actually i got fever a month back i took antibiotics. 3 days back i visited a Doctor who just checked me and told its ameobasis colits, he gave ofloxin and ornidazole plus omez, vizylac and unizyme syrup. before taking this medicine i was just having yellow oily stools, but after taking this today morning i found my condition well but bit black stools.. could u plz suggest me is it duue to drug or what/