Medication Management

SSRIs, SNRIs, Bupropion: How a Prescriber Chooses Your First Antidepressant

By Dr. Stacey Forbes, DNP, APRN, PMHNP-BC · Updated October 12, 2026

No antidepressant is the best one for everyone. Large studies show that most work better than placebo and that the gaps between them are small, which means the real skill in choosing a first antidepressant lies in matching it to the person. A prescriber looks at the symptoms you most want relief from, the side effects you most want to avoid, your other health conditions and medicines, and what has or has not worked for you or your family. This guide explains how those factors steer the choice, class by class.

What the evidence says about differences

The largest comparison to date, a network meta-analysis led by Andrea Cipriani and published in The Lancet in 2018, pooled 522 trials. All 21 antidepressants studied were more effective than placebo for adults with major depressive disorder. Some differences between drugs appeared, especially in head-to-head trials, but they were smaller when all trials were considered, and the uncertainty around most comparisons was wide.

In plain terms, the first antidepressant is rarely chosen because it is “strongest.” It is chosen because its side-effect profile, interactions and extra benefits suit you. NICE’s depression guideline reflects this: it asks prescribers to discuss which side effects a person particularly wants to avoid — it names weight gain, sedation, and effects on sexual function — along with possible withdrawal effects.

The main options at a glance

Generic names come first here because brand names change and generics are what most pharmacies dispense.

Matching the medicine to your symptoms and health

If anxiety is part of the picture

SSRIs and SNRIs treat both depression and anxiety, which is one reason they are so often first. MedlinePlus lists generalized anxiety disorder among duloxetine’s uses. Some people feel more jittery in the first weeks of any of these medicines, which is worth knowing in advance. For anxiety-focused options, see non-habit-forming anxiety medications.

If you live with chronic pain

Duloxetine is also used for pain from diabetic nerve damage, fibromyalgia and ongoing bone or muscle pain, according to MedlinePlus. When depression and pain travel together, one medicine that addresses both can reduce the total number of prescriptions.

If low energy, oversleeping or smoking stand out

Bupropion works differently from SSRIs and SNRIs. MedlinePlus lists it for depression, seasonal affective disorder, and helping people stop smoking. Because it can cause anxiety and sleep problems in some people, it is usually a better fit for slowed-down, low-energy depression than for depression with marked agitation. Prescribers will generally avoid it if you have had seizures or an eating disorder such as anorexia or bulimia.

If you cannot sleep or eat

Mirtazapine’s drowsiness and increased appetite are side effects for some people and the point for others. For someone who is barely sleeping and losing weight, they can help early on. For someone worried about weight, they are a real drawback. See weight gain on psychiatric medication for more.

If sexual side effects are a concern

Raise this early. A 2009 meta-analysis in the Journal of Clinical Psychopharmacology found that sexual dysfunction occurred significantly more often than with placebo for many SSRIs and SNRIs, including sertraline, citalopram, escitalopram, fluoxetine, paroxetine, venlafaxine and duloxetine. Bupropion and mirtazapine did not differ significantly from placebo. The authors noted limits in the underlying studies, but the pattern is consistent enough to shape a first choice.

Your history counts, and so does your family’s

One of the most useful questions a prescriber can ask is simple: what have you taken before, and what happened? A medicine that helped in a past episode is often a sensible place to start again. One that caused a specific side effect tells your prescriber something about which others to avoid. NICE’s guideline explicitly asks about treatments people have found helpful in the past.

Family history can help too. If a parent or sibling did well — or very poorly — on a particular antidepressant, mention it. It is not a guarantee, but it is real information, and it costs nothing to share.

Prescribers also ask about any past periods of unusually high energy, little need for sleep, or racing thoughts, because a history of mania or hypomania changes the treatment plan for depression. See integrative medication management for bipolar disorder.

Interactions and the rest of your medication list

Before choosing, a prescriber should see everything you take: prescriptions, over-the-counter medicines, supplements, alcohol, cannabis and anything else. A few examples of why it matters:

• Patient information for bupropion and mirtazapine asks whether you have taken an MAOI in the past two weeks, because the combination is unsafe.
• MedlinePlus advises asking a doctor about alcohol with duloxetine, because drinking can increase the risk of serious side effects.
• Some supplements affect serotonin or the liver enzymes that clear antidepressants.

Our guides to supplement–medication interactions and alcohol and psychiatric medication cover the details.

Where pharmacogenomic testing fits

Pharmacogenomic tests such as GeneSight look at genes that affect how your body processes certain medications. They can flag medicines you may clear unusually fast or slowly, which can help explain past side effects or inform a choice after earlier medicines have not worked. They cannot tell you which antidepressant will relieve your depression. Rather than repeat the details here, see does GeneSight testing work? and GeneSight versus trial-and-error prescribing.

Young adults and the boxed warning

All antidepressants carry a warning about an increased risk of suicidal thoughts and behavior in children, teenagers and young adults; MedlinePlus’s duloxetine page describes the risk in people under 24. This does not mean young adults should avoid treatment, but it does mean closer follow-up in the first weeks. See antidepressants and teens: the boxed warning explained.

What a good first plan includes

Whichever medicine is chosen, a good first plan usually starts low, changes one thing at a time, and sets a follow-up before the medicine has had time to fully work. It also explains how long to wait before judging it; see how long psychiatric medication takes to work. If the first choice does not suit you, the next step is a planned adjustment or switch, not starting over from scratch.

At Willow & Stone, a first prescription follows a 90-minute integrative evaluation that looks at sleep, nutrition, hormones and labs alongside symptoms, so the choice reflects the whole person. Learn more about our approach to integrative medication management, or book a consultation.

Common Questions

Sources & Further Reading

• Cipriani et al. — Comparative efficacy and acceptability of 21 antidepressant drugs (The Lancet, 2018)
• NICE NG222 — Depression in adults: treatment and management (recommendations)
• Serretti & Chiesa — Treatment-emergent sexual dysfunction related to antidepressants: a meta-analysis (J Clin Psychopharmacol, 2009)
• MedlinePlus — Bupropion
• MedlinePlus — Duloxetine
• MedlinePlus — Mirtazapine

This article is general education, not advice for your situation. Do not start, stop, or change a medication or supplement without talking to the clinician who prescribes it.