# Molecule Handedness Determines Drug Effectiveness

> Chirality explains why some drugs work and others cause birth defects.
- Title: Molecule Handedness Determines Drug Effectiveness | Shortify
- Summary: Chirality explains why some drugs work and others cause birth defects. Thalidomide's mirror-image forms caused birth defects, while ibuprofen's single form…
- Keywords: chirality, thalidomide, ibuprofen, l-dopa, glucose, noble prize, chemistry, molecules, drug effectiveness, pharmaceuticals, science, ideas
- Source: The Conversation — https://theconversation.com/a-molecules-handedness-can-determine-whether-its-an-effective-drug-4-examples-of-pharmaceuticals-where-chirality-matters-293909
- Author: Cedric Schaack
- Read time: 1 min
- Topics: chirality, thalidomide, ibuprofen, l-dopa, glucose, noble prize, chemistry, molecules, drug effectiveness, pharmaceuticals, science, ideas
## Nobel Prize for Chirality
Henri Kagan and Kenso Soai won the 2026 Nobel Prize in chemistry for their work on chiral molecules.
## What is Chirality?
Chirality describes objects that have mirror images which cannot be superimposed on the original.
## Chirality in Daily Life
Your hands are mirror images that cannot be laid on top of each other with palms facing the same way.
## Homochirality in Life
Nearly every protein on Earth uses one mirror-image form of each amino acid, and DNA assembles to form helices of one chirality.
## Racemic Mixtures
Chemists create racemic mixtures, an even 50:50 blend of both mirror-image forms of a molecule.
## Kagan's Catalyst Discovery
Kagan found a catalyst that speeds up reactions without needing molecules of the same handedness.
## Soai's Self-Replicating Molecule
Soai discovered a molecule that makes copies of itself favoring its own mirror-image form.
## Thalidomide Tragedy
Thalidomide caused birth defects in over 10,000 children after being prescribed for morning sickness.
## Ibuprofen's Chirality
Ibuprofen's S form blocks pain signals, while the R form is largely inactive in the body.
## L-DOPA for Parkinson's
L-DOPA helps Parkinson's patients by converting to dopamine in the brain.
## Glucose's Chirality
D-glucose is the form cells use for energy, while L-glucose does not raise blood sugar.
## Chirality Beyond Medicine
Chiral molecules emit circularly polarized light for displays and security tags.
## Why Handedness Matters
A drug's mirror image may fit perfectly with receptors or cause unintended side effects.
## The Consequence
Controlling chirality ensures drugs work without causing birth defects or side effects.
## Key takeaway

Thalidomide's mirror-image forms caused birth defects, while ibuprofen's single form works in the body.