Hi
Thanks for writing to the forum!
We have a similar discussion on MedHelp which you can read:
http://www.medhelp.org/forums/gastro/messages/37562.html
Green stools can be due to diarrhea caused by salmonella bacteria, certain food and food dyes, swallowed post nasal drip if there are associated cold symptoms, Giardia infection or due to viral gastroenteritis.
It is difficult to comment beyond this at this stage without examining. You shouldyou’re your stool examined. It is unlikely to be due to the medication. Please let me know if there is any thing else and do keep me posted. Take care!