A few years ago, my 6'7" tall friend Matt was visiting and got a headache. He asked for some Tylenol. I gave him two. He looked at me and said, "Dude, I'm 250 pounds. Give me four." I had never thought about that before. I just had "Take 2 Tylenol" ingrained in my head ever since I was a kid. My wife and I are currently on the same antihistamine for our allergies, and I remembered that story this morning. So, I ran to check the bottles, and sure enough, each of us are getting 180 mg each. So, the question remains: Is she getting twice the proper dosage, or am I getting half?