My mother is around 60 years old and having severe back pain and unable to sit or sleep, kind of sciatica, doctor has suggested to use belt, give hot water bag, and take medicine Zerdol Sp, still no relief after having medicine for 5 days , medicine has been prescribed for 2 months. Should she continue with the medicine or should consult doctor for some other medicine. Please suggest. She also has Asthama tendency so we are little concerned for taking different medicines.