Welcome to healthcare magic! Are you taking only Ubicar or some other medicines along with it? This medicine should not cause any side effects in the dose you have mentioned. But at the same time, will not be of much use to relieve your backache. The most important thing to deal with backache is your exercise. Learn exercises from physiotherapist to improve tone of your abdominal muscles. DO back exercises because most of the time its mechanical backache. Focus on your posture. Avoid prolonged sitting. Stretching exercises should be done at regular interval. If you are overweight, reduce your weight. Sometimes stress is contributor, so practice stress management techniques like yoga/meditation.