the.com/dose
The exact amount of something good, bad, or chemical you're meant to handle.
means A measured quantity of a substance, especially medicine, taken or given at one time.
from From Greek dosis, a giving or portion, via Latin and French — literally what's handed to you.
Poison ruleParacelsus said the dose makes the poison.
Figurative useA dose of reality cures no one gently.
Slang detourOnce meant a venereal infection in WWI-era talk.