Can i take dayquil or zyrtec while having a concussion? im having nasel congestion pretty bad

Safe but: No reason to avoid, but I'd might consider cold preparations with DM. In most states, have to sign for those but what I'd recommend.

Not good idea!: One of the cardinal signs of developing nastiness after a concussion is its effect on your mental status. While Zyrtec (an antihistamine) only makes about 7% of patients drowsy why confuse the picture?