Hey guys, pretty simple question, but I've seen conflicting answers...

Am I allowed to bring Sudafed in? I also have one of my best friends that lives in GDL and even he was unsure. I've had a lot of trouble with my ears over the last few years with flying constantly, and now I need to take sudafed before and after my flight. I haven't been back since I was told to do this by my DR. Thanks for any help, I've got a last min trip down there this weekend.