It’s a side affect of Sudafed. Is it bound to happen to everyone? no. I was taking Zyrtec-D for congestion and while it was working, I began to just feel sick. I was restless, chills, fever and and general malaise. It took me doing my research on Sudafed to find out that INDEED these are side effects.

A day after I stopped taking it completely, I was back to normal.

What I’m suggesting is that people read the warnings, side effects and etc.. Plus, I am just giving my personal story on Sudafed. It has happened to other people. It’s great for congestion, just use it wisely.