This overview explains Wellbutrin (bupropion) side effects that affect mood, using the most recent FDA-approved labeling and regulatory references. It also summarizes what to expect when starting Wellbutrin, including anxiety, irritability, and activation effects described in the FDA label.
Founder at Anticipate
Updated:
Anticipate is not a medical provider and does not offer medical advice, diagnosis or treatment. The content on this page is informational and should not replace advice from your healthcare professional. Always speak with your clinician about medication questions or changes in mood.
Primary source: FDA Prescribing Information – Wellbutrin XL (Revised 2025)
Wellbutrin (generic name: bupropion hydrochloride) is an antidepressant approved by the U.S. Food and Drug Administration (FDA) for the treatment of major depressive disorder (MDD) and other indications depending on formulation.
According to the FDA-approved prescribing information, bupropion affects neurotransmitters involved in mood regulation and activation. It is often described clinically as having a more “activating” profile compared to some other antidepressants.
Because bupropion affects norepinephrine and dopamine activity, some people feel increased energy and motivation. Others may notice side effects such as anxiety, irritability, restlessness, or insomnia, especially when starting Wellbutrin or after dose changes.
Source: https://medlineplus.gov/druginfo/meds/a695033.html
The following information is based directly on the FDA-approved prescribing information (2025 revision) and related patient guidance materials.
According to the FDA prescribing information, the most common side effects of Wellbutrin affecting mood may include:
These effects are often observed early in treatment or after dose adjustments.
The FDA labeling highlights the potential for neuropsychiatric adverse events, which may include:
The prescribing information emphasizes monitoring for behavioral and mood changes, especially during the initial months of treatment or after dose changes.
Like other antidepressants, Wellbutrin carries an FDA boxed warning regarding the increased risk of suicidal thoughts and behaviors in certain populations, particularly younger individuals.
The FDA recommends close observation for:
For UK users, official safety and prescribing information is available through:
These sources similarly list anxiety, agitation, insomnia, and mood changes among documented adverse reactions.
EMC Patient Leaflet: https://www.medicines.org.uk
BNF Monograph: https://bnf.nice.org.uk
According to FDA prescribing guidance and patient medication guides, side effects when starting Wellbutrin may appear early in treatment, particularly during the first weeks.
Some Wellbutrin side effects such as anxiety or irritability may be influenced by lifestyle factors or medication timing. Even if Wellbutrin is a factor, mood shifts are often amplified by:
The FDA labeling emphasizes monitoring for behavioral and mood changes, particularly:
This is where structured mood tracking becomes clinically useful.
Anticipate is not a medical device and does not replace professional care. However, as a mood tracking app, it can support the type of observation the FDA recommends by helping users monitor patterns such as:
By reviewing mood patterns over time, users may be better prepared to discuss changes with their healthcare provider.
This page is based on publicly available, up-to-date regulatory sources including:
Information is reviewed periodically to reflect the latest official updates.
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