Nausea with antibiotics is pretty common, but you might want to check with your doctor about it kasi sometimes pwedeng i-adjust ang timing or take it with food, or baka may mas magaan na option para sa'yo, a few of us moms had the same issue at nag-suggest ang doctor ng ibang brand or take it after eating instead ng on empty stomach. How long have you been taking it? If it's really unbearable, definitely mention it sa next check-in so ma-address niya properly.