Had root canal, put on amoxisilun, got the runs.first day bad, still have but not as bad. will i be like this until meds are gone?

Possibly: People react differently to different antibiotics which can upset the bacterial balance in your intestines. Speak to your dentist and solutions to help ease your discomfort. Feel better soon..

Probably: Depending upon the extent of the infection; however you should report this to the dentist. A change of prescription may be indicated.

Maybe: I don't know the dosage you are on, but the regular adult dosage is 500 mg every 8 hours. Have you antibiotics with a full 12-16 oz cup of water and try not to let you stomach empty. (several small meals during the day). Antibiotics irritate your stomach and intestines. The diarrhea can cause dehydration so drink a lot.

Try a probiotic: Antibiotics cause big changes in the flora of the gut. Replacing and supporting the remaining gut bugs will help maintain your health. Yogurts help but a broad digestive probiotic is the most effective.

After meals: Sometimes taking your antibiotic after eating will help.