Hello, Yes, Normaxin may cause side effects. It contains Chlordiazepoxide, Clidinium Bromide, Dicyclomine and is used for peptic ulcer disease, irritable bowl syndrome, diarrhoea, anxiety, insomnia, behavioural disorders. Side effects includes: irregular or fast heart rate,heartburn, eye pain, sensitivity of the eyes to bright light, headache, weakness, nervousness, difficulty urinating, dry mouth, vomiting, constipation, confusion,ataxia anemia, abdominal pain. Excess gas in the stomach can be caused by eating spicy /gas-forming food, stress, not chewing your food, digestive disorders or alcohol. You should try to limit high-fat foods , avoid vegetables like broccoli, cabbage, beans and sweeteners like sorbitol which is found in candies and soft drinks. Try to limit amount of alcohol. Exercise and sports also may help. Hope I have answered your query. If you have any further questions I will be happy to help.