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, with similar overall success rates for depression.
• Both have been available as inexpensive generics for years, and the brand and generic versions contain the same active medication.
• Both follow a similar timeline. Some effects can show early, while the fuller effect on mood usually takes about four to six weeks, sometimes up to eight.
• Both carry the antidepressant boxed warning about a possible increase in suicidal thoughts in people under 25, especially early in treatment or after a dose change.
• With both, side effects tend to arrive before the benefit, and a quiet first few weeks is normal rather than a sign of failure.

That shared list is shorter than it would be for two SSRIs, and the reason is the next section. These drugs overlap in purpose but not in mechanism, and mechanism drives most of what follows.

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. That difference in target is not a technicality. It explains why these drugs feel different and why they fit different people.

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. It often feels calming. Bupropion is not a first choice for anxiety. Because it is activating, it can make anxiety worse for some people. For a person whose depression comes packaged with significant anxiety, and the two often travel together, that single point frequently settles the decision in favor of escitalopram.

Sexual side effects are another clear difference. Escitalopram commonly causes them, and by many measures a third or more of people on an SSRI notice some change in sex drive, arousal, or orgasm. Bupropion rarely causes sexual side effects. In fact, bupropion is sometimes added to an SSRI specifically to counter the sexual side effects the SSRI is causing. For someone for whom this matters a great deal, bupropion has a real edge.

Energy and activation are the flip side of the anxiety point. Bupropion is activating. It can help with low energy, fatigue, and low drive, and some people notice more energy fairly early. But that same quality can cause insomnia or jitteriness, especially in the first weeks. Escitalopram is more neutral, and for many people it feels calming rather than stimulating. So the same trait that makes bupropion a good fit for a tired, low-drive depression makes it a poor fit for an agitated, anxious one.

Weight is similar but not identical. Escitalopram is roughly weight-neutral in the short term, with modest gain possible for some people over the longer term. Bupropion is weight-neutral or linked with mild weight loss, and it can reduce appetite. That sets bupropion apart from several other antidepressants and is one reason it is sometimes chosen when weight is a concern.

Two safety points apply to bupropion but not escitalopram. Bupropion lowers the seizure threshold in a dose-related way, so it should not be used in people with a seizure disorder, in people with a current or past diagnosis of anorexia or bulimia, or in people abruptly stopping heavy alcohol or sedative use. Daily-dose and single-dose limits exist specifically to keep that risk low. Escitalopram does not carry that concern. Escitalopram, in turn, has a dose-related effect on the QT interval, a measure of the heart's electrical timing, so it has a lower maximum dose for adults over 65 and people with significant liver problems. Bupropion does not have that QT effect. Bupropion can also slightly raise blood pressure, which a prescriber may monitor.

Bupropion also has a use escitalopram does not. Under the brand name Zyban, it is approved to help people quit smoking. For someone who is depressed and also wants to stop smoking, that is a genuine practical advantage.

Side effects compared

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

Bupropion is more likely to cause insomnia, jitteriness, restlessness, dry mouth, headache, 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, which is why doses are spaced out and capped.

Escitalopram is more likely to cause nausea and other stomach effects early on, headache, increased sweating, sexual side effects, and changes in sleep. It is generally well tolerated and often regarded as one of the better-tolerated SSRIs. With both medications, the early effects often ease within a couple of weeks. 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, and the once-daily extended-release form is taken in the morning. Escitalopram is more neutral. It can disturb sleep or, less often, make some people sleepier, and it can be taken in the morning or evening depending on which way it tilts.

For weight, both are roughly weight-neutral. Bupropion is sometimes linked with mild weight loss, while escitalopram can be associated with modest gain over the longer term for some people.

For sexual effects, the two differ the most. Escitalopram commonly causes lower sex drive, delayed orgasm, or arousal and erection 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, which is a very common combination, or when a calmer profile is wanted. It is also a sensible pick for someone who is already agitated or sleeping poorly and would not do well with an activating drug. Escitalopram's broad use across anxiety conditions makes it the more flexible option when anxiety is anywhere in the picture.

A clinician might choose bupropion for depression that comes with low energy, fatigue, low motivation, or trouble concentrating, where its activating profile can help. It is also a strong choice 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.

A few scenarios make this concrete. A person whose depression shows up mainly as worry, restlessness, and poor sleep is usually better served by escitalopram. A person whose depression shows up as exhaustion, low drive, and difficulty getting going, and who is also bothered by the idea of sexual side effects, is often a good candidate for bupropion. Someone with a past eating disorder should not take bupropion at all, which removes the choice. Prior response also matters. If a person did well on one of these before, that is often the one to return to.

The two are also sometimes prescribed together, often to treat depression while limiting sexual side effects. That combination pairs escitalopram's serotonin effect with bupropion's different mechanism, and it is a recognized strategy rather than an unusual one.

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, especially whether anxiety or low energy is more prominent, 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.

Common questions

Can you take Wellbutrin and Lexapro together? Yes, and it is a recognized strategy. Clinicians sometimes combine the two to treat depression while limiting the sexual side effects an SSRI can cause, since bupropion rarely causes them. The combination should only be set up and adjusted by a prescriber, who will weigh the seizure caution and other factors.

Which one is better for anxiety? Escitalopram. It is approved for generalized anxiety disorder, is used across anxiety conditions, and often feels calming. Bupropion is activating and can worsen anxiety for some people, so it is not a first choice when anxiety is prominent.

Which is less likely to cause sexual side effects? Bupropion. Sexual side effects are common with escitalopram, as with other SSRIs, and rare with bupropion. That difference is one of the main reasons a clinician might choose bupropion, or add it alongside an SSRI to offset those effects.

Will either one cause weight gain? Bupropion is weight-neutral and sometimes linked with mild weight loss, and it can reduce appetite. Escitalopram is roughly weight-neutral in the short term, though some people see modest gain with long-term use. If avoiding weight gain is a priority, bupropion has the edge, but the choice still depends on the whole picture and is made with a prescriber.

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.