Why medications affect people differently:
Two people can take the same medication, at the same dose, for the same condition, and have completely different results.
Your body doesn’t process medication the same way as someone else’s.
Your genes influence:
- how fast a drug is broken down
- how much of it reaches your brain
- how your brain responds to it
Some people:
- break down medications quickly → effects may feel weaker
- break them down slowly → effects may feel stronger or last longer
This is controlled by enzymes, which are influenced by your genes.
Even if the same amount of a drug reaches the brain, it can still affect people differently.
This is because genes also influence:
- receptor sensitivity
- neurotransmitter levels
- overall brain chemistry
So the same medication can interact with two brains in different ways.
This is why:
- one medication works really well for one person
- does nothing for another
- causes side effects in someone else
It’s not just the drug—it’s the biology it’s interacting with.
The Simple Way™:
Medication = input
Your body/brain = system processing it
Different systems → different outputs
This is part of a field called pharmacogenetics, which studies how genes affect responses to drugs.
The goal is to eventually match people with treatments that fit their biology more precisely.
Your reaction to medication isn’t random.
It’s shaped by how your genes and brain interact with what you take.
