It's very common for people taking antibiotics to have gastrointestinal problems. Many people complain of the same symptoms you have when taking the antibiotic.
To minimize the symptoms, try eating more liquid, soft and bland foods. Yogurt with live cultures (look on the label) will help keep the normal bacteria (that are good for you and your GI tract health) from being wiped out by the antibiotic. Other foods you can try are brothy soups, oatmeal, gingerale or lemon/lime soda, crackers, milk toast, jello. Anything that appeals to you in small amounts at a time, and as long as it is bland.
Since you have a cough and are taking an antibiotic, I am going to assume that you have a respiratory infection. If so, it is common for the cough to take awhile to gradually improve.
You should contact your physician if the following happens:
- If you have many days of the antibiotic left and the nausea is very severe where you can't eat anything that relieves it, you may need to change the medication to something you can tolerate.
- You develop fever.
- You develop difficulty breathing.
- Your nausea becomes more severe and/or you develop diarrhea that lasts more than 24 hours.
Try the yogurt first. Many people swear by this.
Hope this helps. Let me know if you have other questions.