I can't tell if allergy medicine doesn't work or if I have a cold. Maybe both. Either way the companies that make allergy medicine win. I have to buy the stuff for four days to see if it does anything. Then I'm not sure if the allergy meds I've chosen aren't the right fit for me, so I have to try another one. Then either the new meds work or I did have a mild cold but it's finally run its course.