Stomach pain, gastritis, bloating, and constipation can sometimes occur in people taking Gluformin XL 500 because metformin-based medicines may irritate the stomach and intestines in certain individuals. Your fasting sugar level of around 110 shows that your diabetes is currently fairly controlled, but ongoing stomach discomfort should not be ignored if it is affecting your daily routine or eating habits. Some people feel better by taking the medicine after meals, drinking enough water, increasing fibre intake, and avoiding spicy or oily foods. However, if the gastritis and constipation continue, your doctor may consider changing the dose, adjusting the timing, or selecting another diabetes medicine that is easier on the stomach. The best option depends on your sugar levels, kidney function, weight, digestion, and overall health condition. Regular walking, smaller balanced meals, proper sleep, stress control, and avoiding late-night eating may also help improve digestion and maintain stable sugar levels naturally. Avoid stopping or changing medicines on your own because this may affect diabetes control. Talk to your doctor if the stomach pain, constipation, acidity, or bloating keep returning or become more severe despite following precautions.