HI Doctor, I'm 31 yrs old. I had severe stomach pain for nearly a week. Hence I went to the doctor available nearby. He took blood test for H. Pylori and has confirmed about the presence of the bacteria. He had suggested me 3 medicines 1 before food and other 2 after food with the gap of 12 hrs for 14 days the medicines are as follows. 1. Before food-ultrazole 30mg 2. Clarimac 500mg - after food 3. Co-Amoxiclav 1000mg -after food. After having the above mentioned tablets, my stomach pain got reduced, but the issue is that after 3 days of dosage i'm passing motion for minimum 3 times a day and the color of stools is black. is there any side effects having these tablets? Kindly advice. Since I crossed 1 week of the dosage given to me. Thanks