When there are generics available then the patent has expired
. I would go to a good pharmacy to buy my generics. Who knows what you get online, as it is not regulated. You can try to reduce your asthma symptoms through getting plenty of rest, a good diet and keeping your bedroom clean. Dust mites is one of the most common asthma triggers, so your sleeping environment (that you sleep in 8 hours/day), needs to be as clean as possible.