Advent forte antibiotic was prescribed for my 3yr 7mnths old son for 5 day.i have completed 3 and1/2 day course.and he is having face swelling and ulcer in his mouth and he is not able to anything and i have stopped giving him antibiotic is it fine?

There is not enough information to advise on the duration of that antibiotic course you have used however in view of the facial swelling and mouth ulcers I would suggest you take your child back for reevaluation. The 3 day course of antibiotics may not have made any difference because your child did not have bacterial infection however if he does the number of days may not be adequate. find cause.