I hope this might be some help.
MED.A.020 Decrease in medical fitness
(a) Licence holders shall not exercise the privileges of their licence and related ratings or certificates at any time when they:
(1) are aware of any decrease in their medical fitness which might render them unable to safely exercise those privileges;
(2) take or use any prescribed or non-prescribed medication which is likely to interfere with the safe exercise of the privileges of the applicable licence;
(3) receive any medical, surgical or other treatment that is likely to interfere with flight safety.
(b) In addition, licence holders shall, without undue delay, seek aero-medical 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;
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(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;
(7) first require correcting lenses.
https://www.easa.europa.eu/system/fi...20Part-MED.pdf