Wellbutrin vs Lexapro

How they're similar

Bupropion and escitalopram come from different drug classes, but they still share several important features.

• Both treat depression, and both are considered first-line, meaning a reasonable first medication to try.
• Both are effective.
• Both have been available as inexpensive generics for years.
• Both follow a similar timeline. Some effects can show early, while the fuller effect on mood usually takes about four to six weeks.
• Both carry the antidepressant boxed warning about a possible increase in suicidal thoughts in people under 25, especially early in treatment.

How they differ

This is where these two medications separate. They work in different ways, and that single difference drives the rest. The table below sums up the core points, with more detail underneath.

Bupropion is an NDRI, a norepinephrine-dopamine reuptake inhibitor. It works on the brain chemicals norepinephrine and dopamine. Escitalopram is an SSRI, a selective serotonin reuptake inhibitor. It works on serotonin. Reuptake inhibition means the medication slows the recycling of a brain chemical so more of it stays available between nerve cells.

Anxiety is one of the clearest practical differences. Escitalopram is approved for and effective for generalized anxiety disorder, and it is widely used across anxiety conditions. Bupropion is not a first choice for anxiety. Because it is activating, it can make anxiety worse for some people.

Sexual side effects are another clear difference. Escitalopram commonly causes them. Bupropion rarely does, and bupropion is sometimes added to an SSRI specifically to counter sexual side effects.

Weight is similar but not identical. Escitalopram is roughly weight-neutral. Bupropion is weight-neutral or linked with mild weight loss for some people.

Energy is the flip side of the anxiety point. Bupropion is activating. It can help with low energy and fatigue, but it can also cause insomnia or jitteriness. Escitalopram is more neutral, and it can feel calming.

Two safety points apply to bupropion but not escitalopram. Bupropion has a dose-related seizure risk, so it should not be used in people with a seizure disorder, or with a current or past eating disorder. Escitalopram does not carry that concern. Escitalopram, in turn, has a dose-related effect on the QT interval, a measure of heart rhythm, so it has a lower maximum dose for older adults. Bupropion does not have that QT effect.

Bupropion also has a use escitalopram does not. It helps people quit smoking.

Side effects compared

Because these two medications work differently, their side effects differ too.

Bupropion is more likely to cause insomnia, jitteriness, dry mouth, and sometimes a worsening of anxiety. It rarely causes sexual side effects, and it does not tend to cause weight gain. Its main safety concern is the dose-related seizure risk.

Escitalopram is more likely to cause nausea and other stomach effects early on, increased sweating, sexual side effects, and changes in sleep. It is generally well tolerated. With both medications, if a side effect is severe, or it is not improving after a few weeks, that is a conversation to have with a prescriber rather than a reason to stop on your own.

Sleep, weight, and sexual effects

These three areas show the contrast clearly.

For sleep, bupropion is activating and can cause insomnia, so it is usually taken earlier in the day. Escitalopram is more neutral, and it can disturb sleep or, less often, make some people sleepier.

For weight, both are roughly weight-neutral. Bupropion is sometimes linked with mild weight loss.

For sexual effects, the two differ the most. Escitalopram commonly causes lower sex drive, delayed orgasm, or arousal difficulties, and these effects tend to last as long as the medication is taken. Bupropion rarely causes sexual side effects, which is one reason it is sometimes chosen, or added to an SSRI to offset them.

Why a clinician might choose one over the other

Because the two medications are so different, the choice usually follows the symptom picture.

A clinician might choose escitalopram for depression that comes with anxiety, or when a calmer profile is wanted.

A clinician might choose bupropion for depression with low energy or fatigue, or for someone who wants to avoid sexual side effects or weight gain, or who also wants to stop smoking. Bupropion is not a good fit when anxiety is prominent, or when there is a seizure disorder or an eating disorder, current or past.

The two are also sometimes prescribed together, often to treat depression while limiting sexual side effects.

The bottom line

Bupropion and escitalopram are genuinely different tools, not two versions of the same thing. The right choice depends on a person's symptom picture and on which side effects they most want to avoid. That decision is best made with a prescriber, and switching or combining is a normal part of treatment.

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes.

1. U.S. Food and Drug Administration. Bupropion prescribing information.
2. U.S. Food and Drug Administration. Escitalopram prescribing information.
3. MedlinePlus, U.S. National Library of Medicine.
4. National Institute of Mental Health. Mental health medications.