My son is 2 and half years old. Sometimes he gets stomach pain at night so much that he would be crying a lot for a long while. So his doctor prescribed him Colimex(Suspension). We use it when it is bad only that means we might use it once in a 3 months or less. My question is how long after opening the syrup we can use it. I had been suggested at the hospital to not use paracetamol syrup after 1 month of opening. Similarly for many other medications for him. So, how long after opening Colimex we can use it.