Drugs are substances that can alter the functioning of the brain and body by interacting with neurotransmitters, receptors, and other neural processes. They can have various effects such as stimulating or inhibiting neural activity.
These are proteins located on the surface of cells that receive chemical signals from neurotransmitters. Drugs can bind to these receptors and either activate or block their function.
This is a neurotransmitter associated with pleasure and reward. Many drugs, such as cocaine or opioids, increase dopamine levels in the brain, leading to feelings of euphoria.