At times, depending on the infection present, doctors may have to advise antibiotic and there may be no alternate options to that. Loose motion is a common adverse reaction associated with taking Augmentin. If your loose motion persist, avoid drinking tea, coffee, carbonated cold drinks and alcohol. However please make sure you are drinking plenty of water. Also having yogurt may help. And please discuss with your dentist about this problem.
Next Steps
Discuss with your doctor about your upset stomach after taking antibiotic.