First of all, if it is a common cold
that you have, it doesn't mean you are breathless. The leaflet probably wants to mean breathlessness when there is increased respiratory effort such as in heart failure
, respiratory failure
, etc. Common cold rarely leads to a breathless of that kind. You can go ahead with the 2mg tablet about half an hour before boarding.
The tablet needs to be taken orally. If you take it with some food, more of the drug will be available for action. Avoid alcohol, grapefruit juice along with the tablet. The bio-availability of the pill is good, and you don't need to consider sub-lingual or any other way. Just swallow it with plain water. It has a fast onset of action. It will help you relax and prevent physical symptoms of anxiety
Hope this helps. You may consider going in for psychotherapy
for a long term solution.
Abhijeet Deshmukh, MD