system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Viagra and alcohol are both vaso-dilators so how come they have opposing effects?
gpt
Alcohol is a central nervous system depressant. Even though it does have some vasodilating effect, the suppression of your CNS is much more pronounced. You need your brain to tell your little buddy it's time to go, alcohol makes this more difficult.