Cetirizine
"From 8 year suffering from allergy, asthma attack were normal for me. I had no control on them but when I started taking cetirizine I found a magic to control my attacks.
Now for 4 yrs I"m keeping this tablet in my wallet. Whenever I have any symptoms I take this. It really works like miracle.  Generally in a month I need this 6-8 times this tab. For me it is a life saving drug."