Hi, Dulcolax is a laxative medication that can help relieve constipation by stimulating bowel movements. However, it is unlikely to cause delayed periods. Delayed periods can have many causes, including stress, changes in weight, hormonal imbalances, or underlying medical conditions. It s essential to consult with a healthcare provider to determine the underlying cause of your delayed period. That said, constipation and straining during bowel movements can sometimes cause discomfort and pain in the lower abdomen, which may be mistaken for menstrual cramps. Your discomfort on the large colon side may be related to your constipation rather than your menstrual cycle. If you are concerned about the effect of Dulcolax on your menstrual cycle or experiencing discomfort or pain, you should speak with your healthcare provider. They can help you evaluate the cause of your symptoms and suggest appropriate treatment options. In the meantime, you may want to try other approaches to manage constipation, such as increasing your water intake, eating more fiber-rich foods, or using other types of laxatives. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician