Diazepam interacts with a brain chemical called gamma-aminobutyric acid. GABA reduces brain activity in control centers for emotions, memory, rational thinking, and involuntary body functions such as breathing. Valium further stimulates these effects of GABA, resulting in muscle relaxation, decreased anxiety, and drowsiness.

https://recoverypartnernetwork.com/drug/benzodiazepine/valium-addiction