Neuromet is a vitamin supplement generally used for neural pain after shingles. These vitamins help in regenerating damaged nerve caused by shingles. Neuromet is free of side effects. You might feel nausea especially when taken in an empty stomach. Constipation is mostly due to bad dietary habits. This is not a side effect of Neuromet. Advice 1. Continue Neuromet as suggested 2. If pain is severe then you can take pregaballin. This is a prescription based medicine. You can ask your doctor about this 3. Include fiber in your diet such as split peas, lentils, black beans, lima beans, sprouts, baked beans, raspberries, pears, apples, barley, bran flakes, and brown rice 4. Syrup Duphalac 2 teaspoonful per oral at bed time 5. Drink 4 – 5 liters of water daily 6. Avoid straining while defecating 7. Divide your meals into smaller portions and eat them frequently during the day 8. Avoid tea and coffee I hope this information will help you. I will be happy if you ask another question Thanks