Welcome to Healthcare Magic Good Day Duphaston s possible side effects can affect individual people in different ways. The following are some of the side effects that are known to be associated with this medicine. Because a side effect is stated here, it does not mean that all people using this medicine will experience that or any side effect. Headache Nausea Dizziness Bloating Skin reactions such as rash and itch Breast tenderness Menstrual spotting between periods Abdomen pain (20% of patients have this) Are you passing gas or having loose stools. Please visit your Gynaecologist to know for sure what is causing the pain.