Your doctor will decide what is most appropriate on the medical history and frequency of infections. Treating each infection as they come, if they are frequent, by antibiotics allows inflammation in the tissues and may cause damage e.g. bronchiectasis or chronic sinus disease.  A few infections will always occur, but if this is less than 3-4 times per year, long term health complications are unlikely.  Preventative antibiotics will help break the cycle of recurrent infection and tissue damage.  In some people they will also slow down the rate of invasive infection, the function your immune system normally undertakes.  That gives time to get to a doctor or hospital for serious infection and then receive the appropriate treatment, without a more serious e.g. sepsis occurring. Take a look at our antibiotic information here.