Guaifenesin / pseudoephedrine
"I took two pills at 3:00 pm, I fell asleep around 10:30 pm and woke up wide awake at 1:00 am! I'm still sneezing and coughing but I'm feeling better than I was before so it works but now I'm wide awake and can fall back asleep and I feel funny like my heart beat is slower. I sure hope this feeling passes!"