It is normal to experience stomach pain and diarrhea as side effects when starting a new medication. These side effects typically lessen over time. It is important to monitor your weight and make sure you are able to eat well. If the symptoms persist or are very bothersome after a few weeks, it is recommended to consult with your prescribing doctor. Additionally, if you experience weight loss, it is important to seek medical advice. With continued use, there is a good chance that these side effects will diminish as your body adjusts to the medication. This can be especially beneficial if other treatments have not been effective for your condition.