Name a common side effect of antibiotics.
One common side effect of antibiotics is an upset stomach, which can manifest as diarrhea, nausea, or vomiting.
Complete the following task based on the instruction and optional input provided.### Instruction:
Name a common side effect of antibiotics.

### Output:
One common side effect of antibiotics is an upset stomach, which can manifest as diarrhea, nausea, or vomiting.