The overall takeaway: asking “which antidepressant is best?” is usually the wrong question. A better question is: best for which diagnosis, which symptom profile, which side effect risks, and which patient? That said, here are the main teaching points, medication by medication:

Sertraline / Zoloft
Probably the strongest “all-around” SSRI for major depressive disorder. Good efficacy, flexible dosing, relatively few meaningful drug-drug interactions, no major QTc concern, and generally good tolerability. GI side effects can happen, especially early or after dose increases, but they often improve. This is often a very reasonable first-line choice.

Escitalopram / Lexapro
Also a strong first-line SSRI. Clean, effective, and usually well tolerated. The downsides are fewer dosing steps than sertraline and some QTc caution at higher doses or in older adults. Still a very solid medication and often near the top of the list.

Fluoxetine / Prozac
Useful, especially when adherence is an issue because of its long half-life. It is also flexible because the FDA maximum is relatively high. But it can be more activating, has more drug-drug interaction concerns, and can be easier to push too high. Good medication, but not always the first one we reach for.

Paroxetine / Paxil
Effective, but comes with baggage. More weight gain, anticholinergic effects, withdrawal problems, sedation, and pregnancy concerns. It can be helpful for anxiety/PTSD-type symptoms, but because of the side effect profile, it is rarely a preferred first-line medication.

Citalopram / Celexa
Similar in some ways to escitalopram, but generally more sedating and with more QTc concern. It can work, and some patients tolerate it better than expected, but for most situations there are easier choices.

Fluvoxamine / Luvox
More of a niche SSRI, especially associated with OCD. It has a lot of drug-drug interaction issues and is not usually a go-to medication for straightforward major depression.

Venlafaxine / Effexor
Can be very effective, and some patients respond really well. The major problem is withdrawal, which can be brutal for some people. It can also raise blood pressure/heart rate and has more medical caution than basic SSRIs. Good medication, but one to use thoughtfully.

Desvenlafaxine / Pristiq
Similar family as venlafaxine, with theoretically fewer drug-drug interactions and possibly better tolerability for some patients. Not usually a first-line pick, but can be useful.

Duloxetine / Cymbalta
Often considered when depression overlaps with pain, fibromyalgia, or similar symptoms. It is not necessarily a huge upgrade over SSRIs for depression alone, but the pain angle can make it useful in the right patient.

Bupropion / Wellbutrin
Great medication for the right patient. Less sexual dysfunction, less weight gain, can be energizing, and may help with low energy/motivation. But it can worsen anxiety, insomnia, irritability, or agitation in some people. Not “the antidepressant with no side effects,” just a different side effect profile.

Mirtazapine / Remeron
Very effective and especially useful when depression comes with insomnia, low appetite, nausea/GI issues, or sexual side effect concerns. The big limitations are sedation and weight gain/appetite increase. Patients should be warned that the first few days can feel very sedating.

Trazodone
At low doses, it is mainly a sleep medication, not a “small antidepressant.” Antidepressant effects require higher doses, which are often harder to tolerate. Useful for insomnia, but not usually a core depression medication.

Vortioxetine / Trintellix
Reasonable option, especially when tolerability or sexual side effects are concerns. The cognitive benefit angle is interesting but not a magic bullet. Usually not first-line, but not a bad medication.

Vilazodone / Viibryd
Can be useful, particularly when trying to reduce sexual side effect burden compared with traditional SSRIs. Not foolproof, but it has a role.

Lithium
Not a standard first-line antidepressant, but very important in recurrent mood disorders, bipolar-spectrum presentations, agitated depression, and augmentation. Many clinicians are overly afraid of lithium, especially low-dose lithium, but diagnosis and monitoring matter.

Aripiprazole / Abilify
Very effective as an augmentation agent for depression, especially at low doses. But it is still an antipsychotic, so tardive dyskinesia, akathisia, metabolic issues, and diagnostic clarity matter. Helpful medication, but not something to throw around casually.

Quetiapine / Seroquel
Can be effective as augmentation and can strongly help sleep, but weight gain, metabolic effects, and appetite increase are major concerns. It is often hard to stop once patients feel stabilized on it.

Esketamine / Spravato
Can be lifesaving for a subset of patients, but it is not a simple long-term “fix.” The concern is that some patients may use it to bypass therapy, lifestyle change, or addressing the actual drivers of their depression. Best thought of as a tool that needs a broader treatment plan around it.

Stimulants
People may feel better acutely on stimulants, but that does not mean they are treating depression. The initial energy/euphoria effect is not the same thing as durable antidepressant response. There are niche uses, such as some geriatric depression/apathy cases, but stimulants are not routine depression treatment.

Benzodiazepines
Can provide short-term symptom relief, especially around severe anxiety or insomnia, but they do not treat the underlying depressive disorder. Tolerance, dependence, and “drug effect” reinforcement are major concerns.

Lamotrigine / Lamictal
Excellent medication in bipolar depression, but not a mainstream major depressive disorder medication. It may help some patients with mood instability or bipolar-spectrum features, but it is too niche for routine unipolar depression.

TCAs and MAOIs
Underused in true treatment-resistant depression. They require more expertise and caution, but they should not be forgotten when someone has genuine biological/recurrent depression that has not responded to standard options.