Serotonin is a neurotransmitter that plays a crucial role in regulating mood, sleep, and appetite. It is often implicated in psychiatric disorders such as depression and anxiety.

Dopamine is primarily involved in reward and motivation. It is released when we experience pleasurable or rewarding stimuli, and it plays a role in reinforcing behaviors that lead to these rewards.

Acetylcholine is the primary neurotransmitter involved in neuromuscular transmission. It is released from motor neurons to stimulate muscle contraction.

Noradrenaline, also known as norepinephrine, is involved in enhancing attention, focus, and arousal. It is released in response to stress or excitement and helps to mobilize the body's resources.

GABA (gamma-aminobutyric acid) is the primary inhibitory neurotransmitter in the brain. It reduces neuronal excitability and helps to maintain a balance in brain activity.

Glutamate is the primary excitatory neurotransmitter in the brain. It plays a crucial role in stimulating synaptic activity and facilitating communication between neurons.

Glutamate is involved in various cognitive processes, including learning and memory consolidation. It is essential for the formation and strengthening of synaptic connections.

In schizophrenia, there is evidence of altered dopamine receptor function, particularly an imbalance between D2 and D1 receptors, leading to abnormal dopaminergic signaling.

Parkinson's disease is characterized by the degeneration of dopaminergic neurons in the substantia nigra, leading to a deficiency of dopamine in the brain.

Benzodiazepines primarily target GABA receptors, particularly the GABA_A receptors, enhancing their inhibitory effects and promoting relaxation and anxiolysis.

SSRIs are a class of antidepressants that specifically target serotonin transporters, inhibiting their reuptake and increasing the availability of serotonin in the synaptic cleft.

Psychostimulants like amphetamines primarily increase dopamine release from presynaptic neurons, leading to elevated levels of dopamine in the synaptic cleft.

Antipsychotics, particularly typical antipsychotics, primarily target dopamine receptors, especially D2 receptors, to reduce dopaminergic activity in the brain.

Mood stabilizers like lithium primarily reduce glutamate excitation by inhibiting its release or blocking its receptors, thereby stabilizing neuronal activity and preventing mood swings.

Anxiolytics like benzodiazepines and barbiturates primarily target GABA receptors, enhancing their inhibitory effects and reducing neuronal excitability, leading to anxiolytic and sedative effects.