Runny nose, itching, sneezing?  In the past, you might have just reached for OTC anti-histamines like Claritin.  But when you bring these complaints to your primary care doctor, sometimes you and your doctor will opt for a prescription strength treatment.  Over the past few years, Flonase (fluticasone) has become an overwhelmingly popular choice as a prescription medication for chronic seasonal (and perennial!) allergy...