question: Dear Doctor,I had a tooth extracted some 4 days ago and was given megamox 1g (taken every 12 hours) together with metronidazole 200mg (taken 3 times daily) both after meals. It should be taken for one week. I mentioned to him I'm  taking daily losartan 50mg and metformin 500mg.  I noticed dark green stools. My stools are soft but not loose. I went to the dentist and told him about it but he said it's because of the antibiotics. I didn't feel any weakness, pain - just normal. Can you give me a piece of your opinion sir? Thank you very much.   Gabby