I thought it could be Adderall. But I'm wrong.

[Niagara]

12. Everyone reacts to medications differently

When Allegra D was a prescription it would knock me out. Everyone else that I worked with that were taking Allegra D acted like they consumed umpteen cups of coffee, and here I was struggling to stay awake at work.

When I went back to doctor, I told them that I had to take it at night instead of the morning. And they said insisted that they gave me the "D" for daytime use. They switched me to Zyrtec D and it still knocked me out. I just ended up taking the prescriptions at night and I told the doctor that the same thing happened with the Zyrtec D. Apparently, I was one of the few that these drugs would have that effect.