Overdose can cause nausea, vomiting, stomach pain, diarrhea, skin rash, drowsiness, hyperactivity, and decreased urination. Augmentin side effects Get emergency medical help if you have signs of an allergic reaction to Augmentin : hives; difficult breathing; swelling of your face, lips, tongue, or throat. I am also taking Augmentin now and have felt nauseous and have had stomach pains that feel like severe gas expanding my stomach. I have taken Amoxicillin alone many times with no side effects at all. Augmentin is not expected to be harmful to an unborn baby, but a woman should tell her doctor if she is pregnant or plans to become pregnant during treatment. Amoxicillin and clavulanate potassium can pass into breast milk and may harm a nursing baby. Note: This document contains side effect information about amoxicillin / clavulanate. Some of the dosage forms listed on this page may not apply to the brand name Augmentin. Hi. Thats a toughie with Augmentin. Its really bad about causing diarrhea, but is a common side effect. For the nausea you might try making sure you have it with some food, unless your directions say otherwise. Augmentin is a prescription antibiotic medication. It’s used to treat infections caused by bacteria. Augmentin belongs to the penicillin class of antibiotics. My pancreatic levels were on their way down and my liver was also, but due to a fever I was put on an Augmentin (SP?) - talk about nausea. The Dr. prescribed something to go with the Augmentin so I didn't think much about the nausea until after my 10 days were up. Augmentin should be taken with food to prevent nausea. Significant nausea that causes vomiting should be addressed to prevent dehydration. With severe nausea that leads to vomiting, stop eating food or drinking fluids. Once you feel ready to resume taking food or fluids, begin with clear liquids, such as small amounts of ginger ale, broth or gelatin. According to the American College of.