A reuptake inhibitor is a type of medication that prevents the reabsorption of neurotransmitters in the brain. Neurotransmitters are chemicals that transmit signals between nerve cells. By blocking their reuptake, these inhibitors increase the levels of neurotransmitters, enhancing their effects on mood and behavior. This mechanism is commonly used in treating conditions like depression and anxiety. Selective serotonin reuptake inhibitors (SSRIs) are a well-known class of reuptake inhibitors that specifically target the neurotransmitter serotonin. By increasing serotonin levels, SSRIs can help improve mood and alleviate symptoms of depression. Other types of reuptake inhibitors may target different neurotransmitters, such as norepinephrine or dopamine.