Funny you should mention this. I was on claritin for about two weeks straight. My alergies cleared up but my right ear is plugged. Not plugged like water... but stuffed and sounds are very muffled. I can't figure it out. I was wondering if my PA is flaring up because I have noticed that I am getting my nagging cough symptoms right before I need to do my Tobi again. I am just as confused on this one.