Guess some of you have taken Viagra, Cialis, Levetra, or Stendra. Nasal stuffiness is not an uncommon side effect of these drugs known as PDE5-inhibitors. By inhibiting PDE5, they enhance the activity of nitric oxide (not to be confused with nitrous oxide), which improves erections by dilating blood vessels.
The same nitric oxide is also present in nasal mucosa (moist area inside nose). Hence, PDE5-inhibitors can cause nasal congestion by enlarging small blood vessels inside the nose.
Thus, one possible explanation for Trump's persistent sniffles during debate is that he might have taken Viagra or a similar drug to feel like a man and to come across as macho, but ended up looking and sounding the opposite due to the side effect.
These drugs can also cause, in some users, difficulty with distinguishing colours. This might explain his persistent squinting during the debate.
Don't buy the Viagra explanation?
How about coming off coke?
Any alternative explanations?