I have a headache and need Tylenol.
Why do you have a headache?
I drank 750ml of bourbon last night.
The issue is not the Tylenol in this case, but that you are contravening CARS 602.03
Alcohol or Drugs - Crew Members
602.03 No person shall act as a crew member of an aircraft
(a) within eight hours after consuming an alcoholic beverage;
(b) while under the influence of alcohol; or
(c) while using any drug that impairs the person's faculties to the extent that the safety of the aircraft or of persons on board the aircraft is endangered in any way.
The hangover means you are under the influence therefore you are not fit to fly. The Tylenol has nothing to do with the issue.
So the Doc would suggest that you not fly for that reason. And that is why Canada is actually a better system than a master list.
My son was told during his PPL scholarship with air cadets, that he can take Tylonal before flying, but not Motrin.
I personally, can see no sane reason for that rule, and I cannot find anything in the air regulations that state it. But the last thing he is going to do is go against what he was told by his flight instructor, if he can't find written verification the flight instructor was wrong.
So if transport Canada never publishes such a list, he will probably grow old and die, never willing to risk taking Motrin for the rest of his life. At least not while he has a current medical.
Over time, I expect this list to grow, as more misinformation spreads. Or if it isn't misinformation, then the same problem occurs. Pilots will start ignoring this valuable information, because they cannot verify it.
The Air Cadet operations also have a bit of a foot in the door with military aviation which has similar, but potentially different, regulations and guidance material. This is taken from an out of date Air Cadet Gliding Manual but:
2. For simple analgesia (e.g. relief of musculoskeletal aches, headache, etc.) the use of acetaminophen (Tylenol) is allowed during flying duty. The use of ASA (Aspirin) and non-steroidal anti-inflammatory drugs (NSAIDS) during flying duty is not allowed unless cleared by a CAME or CF Flight Surgeon. The common cold will be a frequent occurrence during ACGP operations. If individuals take cough and cold medications, prescription or OTC medication and particularly those containing cough suppressants, decongestants and/or antihistamines, they shall not fly until at least 48 hours have passed since discontinuing treatment or they have been cleared by a CAME or CF Flight Surgeon.
3. Other common medications and herbal agents that are prohibited unless cleared for use by a CAME or CF Flight Surgeon include, but are not limited to:
a. Longer-acting antihistamines such as Tavist (clemastine) and Reactine (cetirizine);
b. Hypnotics/Sedatives such as Imovane (zopiclone), Restoril (temazepam) and all the benzodiazepine family;
c. All anti-motion sickness drugs such as Gravol (dimenhydrinate), Bonamine (meclizine) or skin patches containing scopolamine;
d. Muscle relaxants (e.g. Robaxacet (acetaminophen/methocarbamol) and others, especially in combination with codeine or meprobamate such a 282 MEP);
e. Antidepressants such as Celexa (citalopram), Cipralex (escitalopram), Zoloft (sertaline) and Wellbutrin (bupropion);
f. Smoking cessation aids such as Zyban (bupropion) and Champix (varenicline);
g. Systemic steroids (anabolic steroids are not permitted at any time);
h. Isotretinoin (Accutane) for acne treatment;
j. St. John’s Wort;
k. Ephedrine-containing compounds; and