When taken in recommended doses, Panadol Menstrual is unlikely to cause significant undesirable effects and will not upset the stomach. Skin reactions eg, urticaria and aggravation of bronchospasm have been described rarely. Stop taking Panadol Menstrual and seek medical advice immediately if the patient has an allergic reaction, has had shortness of breath in response to aspirin or NSAIDs, bruising, bleeding, skin rash/peeling or mouth ulcers.