The UK CAA and EASA will require licence holders to seek advice from their Aeromedical Examiners if they

(1) are aware of any decrease in their medical fitness that might render them unable to safely exercise those privileges;

(2) take or use prescribed or non-prescribed medication that is likely to interfere with the safe exercise of the privileges of the applicable licence; or

(3) receive any medical, surgical or other treatment that is likely to interfere with flight safety

In addition, licence holders shall, without undue delay, seek aeromedical advice when they:

(1) have undergone a surgical operation or invasive procedure;

(2) have commenced the regular use of any medication;

(3) have suffered any significant personal injury involving incapacity to function as a member of the flight crew;

(4) have been suffering from any significant illness involving incapacity to function as a member of the flight crew

(5) are pregnant;

(6) have been admitted to hospital or medical clinic; or

(7) first require correcting lenses.experience