FYI - the Federal Aviation Administration (FAA) has banned pilots and air traffic controllers from using the prescription anti-smoking drug CHANTIX® (varenicline), manufactured by Pfizer, after new information became available about possible side effects that could impact aviation safety.
All AME's have this morning received an e-mail from the Medical Dept of the CAA saying exactly the same. Any pilots or ATCO's taking this medication are temporarily grounded. May operate normally from 72 hours after the last dose taken.
CAA point out that ZYBAN is also not permitted, due to its side effect profile. However, nicotine replacements ( gum, patches, inhalers) ARE permitted in pilots and ATCO's.