Duvant 138gm Syrup can be taken with or without food to prevent an upset stomach It is important to take it regularly and not stop taking it even if you start feeling better unless directed by your doctor The most common side effect of this medicine is stomach pain and it may also cause diarrhea excessive production of urine and tiredness If any of these side effects persist or worsen it is important to inform your doctor Your doctor may help to reduce or prevent these symptoms by adjusting the dosage or prescribing an alternative medicine Before taking this medicine it is important to inform your doctor about all other medicines you are taking Additionally let your doctor know if you have any existing heart kidney or liver problems If you are pregnant or breastfeeding consult your doctor before taking this medicine to ensure it is safe for you and your baby