This is very vague. Did you eat to much or your stomach is disagreeing with the medicine? I always eat before I take my medicines to avoid this. The over full stomach take antacid for and try next time to reduce how much you are eating or something particular you are eating

It's dif per person, I think that would be on the individual and how well you know your body, some people, not everyone is aware of their body, but I would suggest if uncertain and concerned about get advice from others about the condition at hand or get to the hospital and see what they can offer for the situation you have going, my opinion,