Azithromycin
"I was prescribed this product for an upper respiratory infection yesterday at the ER. The doc said to hold on from taking it for a couple of days because he thought I have a viral infection.  Last night I was feeling so miserable, my sinuses were burning up, chest with lot of congestion, etc. So I called the nurse at the ER to ask if I could just take it right away, I am also pregnant.. She said to go ahead and take it, that it would not hurt if it was viral. I took the first 2 pills around 11pm. I could not sleep, it does raise your heart rate a little, I guess when it fights the infection.. Today I started feeling much better at around 5pm. I am so glad I followed my guts and took this med, it is a miracle med."