Pec D 30mg/40mg Capsule SR is a prescription medicine used to treat gastroesophageal reflux disease (Acid reflux) and peptic ulcer disease by relieving the symptoms of acidity such as indigestion, heartburn, stomach pain, or irritation. Pec D 30mg/40mg Capsule SR also neutralizes the acid in the stomach and promotes easy passage of gas to reduce stomach discomfort. It is taken without food in a dose and duration as advised by the doctor. The dose you are given will depend on your condition and how you respond to the medicine. You should keep taking this medicine for as long as your doctor recommends. If you stop treatment too early your symptoms may come back and your condition may worsen. Let your healthcare team know about all other medications you are taking as some may affect, or be affected by this medicine. The most common side effects are diarrhea, stomach pain, flatulence, dryness in the mouth, and headache. Most of these are temporary and usually resolve with time. Contact your doctor straight away if you are at all concerned about any of these side effects. This medicine may cause dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you. Avoid drinking alcohol while taking this medicine as it can worsen your sleepiness. Lifestyle modifications like having cold milk and avoiding hot tea, coffee, spicy food, or chocolate can help you to get better results. Before you start taking this medicine it is important to inform your doctor if you are suffering from kidney or liver disease. You should also tell your doctor if you are pregnant, planning pregnancy, or breastfeeding.