SSRIs (selective serotonin reuptake inhibitors) are commonly prescribed for depressed patients to increase the amount of serotonin in their bodies. Having a greater amount of serotonin is associated with experiencing more positive emotions.

Lithium is typically used to treat the manic symptomology associated with bipolar disorder.

Selective serotonin reuptake inhibitors interfere with serotonin transport in the brain's synapses and can work to elevate mood. SSRIs are used to treat depression, obsessive-compulsive disorder, schizophrenia, bipolar disorder, and post-traumatic stress disorder. Treatment for personality disorders with SSRIs is not successful. 

Benzodiazepines such as Xanax, Klonopin, Ativan, and Valium, act like sedatives, but without their sleep-inducing effect. These medications can be effective in the treatment of panic disorders.

Selective serotonin reuptake inhibitors (SSRIs) such as Zoloft, Paxil, and Luvox, are mood stabilizers and are used to treat depression. Nardil is a monoamine oxidase inhibitor (MAOI) useful in the treatment of post-traumatic stress disorder by reducing nightmares and insomnia. Catapres and Inderal, which are antiadrenergic agents, are also useful in the treatment of post-traumatic stress disorder. Antiadrenergic agents reduce startle reactions. Lithium is a mood stabilizer used to treat bipolar disorder and schizophrenia.

Depressants are drugs that reduce neural activity and slow down bodily functions. Cocaine is a stimulant, which increases neural activity and speeds up bodily functions. All of the other answer choices are depressants. 

Selective serotonin reuptake inhibitors (SSRIs) block the reabsorption of serotonin in the brain to help ease depressive symptoms. Some of the most popular SSRIs are Zoloft (Sertraline) and Prozac (Fluoxetine).

MAO medication inhibits MAOs, which normally inhibit serotonin, dopamine, and norepinephrine, so that these neurotransmitters can increase in concentration.

SSRIs (selective serotonin reuptake inhibitors) are used to treat depression because they block the reuptake of 5-HT serotonin, allowing it to remain in the locus coeruleus (LC) to block anxiety there.

While the other conditions—MDD, bedwetting, OCD, and PDD—are all FDA-approved for various first-generation and second-generation tricyclic medications, panic disorder is still an off-label use for TCAs. Currently, FDA approval favors selective serotonin reuptake inhibitors (SSRIs) for treatment of panic disorders.

MAOIs have long held a stigma of being associated with fatal dietary and adverse drug reactions—including phenylamines and anesthetic medications. Despite this stigma, recent studies have indicated that some of this longstanding research was based on outmoded or misinterpreted methodology.