Any time I take a new medicine I get very nervous about having a dangerous allergic reaction and I monitor myself really closely at least for the first hour. I've only had one allergic reaction to a drug before and while it was a strong reaction it was nothing life threatening so I'm not sure where this fear comes from. I was really glad the first time I took Zofran was in the ER so there were medical professionals near by if I reacted. Anyone else worry about this?