I am in my mid-30's and have had asthma all my life. Last winter I ended up in hospital because of a bad chest infection. This winter I have been determined to stay on top of things. I think I've come to the conclusion that my chronic sinusitis has caused a lot of my asthma symptoms so I have tried to keep more on top of the sinusitis, going to the GP more often. I've been on antibiotics 4 times this winter and the GP is not sure how to treat. The last time I went, he told me to increase my Cetirizine Hydrochloride does from 1 - 10mg tablet a day to 1 - 10mg tablet twice a day. However, he said that the drug is not licensed to be used in this way. I have been taking them as requested (along with everything else I am on) but I want to know if it's safe to continue on like this and whether anyone else has come across this.