As the primary care physician, how should I manage a female patient on bupropion (Wellbutrin) who for the past week has experienced increased fatigue, emotional lability, panic symptoms, tension‑type headaches, and diarrhea?

Immediate Clinical Assessment and Management

You need to urgently assess whether this patient is experiencing worsening depression with emerging suicidality, neuropsychiatric adverse effects from bupropion, or bupropion toxicity—all of which require immediate intervention. The FDA label explicitly warns that anxiety, agitation, panic attacks, and emotional lability can signal increased suicide risk and necessitate close monitoring and possible medication changes 1.

Step 1: Rule Out Life-Threatening Conditions

Screen for suicidality immediately. Ask directly about:

• Suicidal thoughts, plans, or intent
• Self-harm ideation
• Homicidal thoughts (rare but documented with bupropion) 1

The FDA mandates that symptoms like anxiety, agitation, panic, irritability, and emotional changes—especially when severe or abrupt—may indicate increased suicide risk 1. If positive, this requires same-day psychiatric evaluation or emergency department referral.

Assess for bupropion toxicity. Her symptom cluster (agitation/panic, headache, diarrhea, fatigue) overlaps with bupropion adverse effects and toxicity 2, 3. Ask about:

• Accidental extra doses (most common cause of toxicity) 2
• New medications that could cause drug interactions (bupropion inhibits CYP2D6) 4
• Alcohol use changes (bupropion lowers alcohol tolerance) 1
• Seizure activity—the primary concern in toxicity 1, 2

Step 2: Determine If Symptoms Are Medication-Related

These symptoms are consistent with known bupropion adverse effects. The guidelines confirm that headache, diarrhea, and fatigue are among the most common adverse events with second-generation antidepressants, including bupropion 5. However, the constellation of panic and emotional symptoms is more concerning.

Bupropion can paradoxically worsen anxiety and panic in some patients, despite recent evidence suggesting it may help anxiety in MDD 6. The FDA label specifically warns about emergence of anxiety, panic attacks, and agitation as potential harbingers of clinical worsening 1. One small study even suggested bupropion might help panic disorder 7, but this contradicts clinical experience and the current presentation.

Step 3: Clinical Decision Algorithm

If suicidality is present:

• Discontinue bupropion immediately 1
• Arrange urgent psychiatric evaluation
• Do not restart without psychiatric consultation

If no suicidality but symptoms are severe/intolerable:

• Discontinue bupropion 1
• The FDA label states that severe, abrupt-onset symptoms warrant medication changes 1
• Consider switching to an SSRI, which may be more appropriate for patients with prominent anxiety symptoms 6
• SSRIs showed modest advantage over bupropion in patients with high baseline anxiety 6

If symptoms are mild-moderate and tolerable:

• Increase monitoring frequency to weekly visits or phone calls 1
• The FDA requires "very close monitoring" when these symptoms emerge 1
• Educate patient/family to report worsening immediately
• Consider dose reduction (though not standard practice)
• Reassess in 1 week—if no improvement or worsening, discontinue

Step 4: Address Specific Symptoms

For tension headaches and diarrhea: These are common adverse effects 5 but typically improve with time. Symptomatic management is reasonable if continuing bupropion.

For panic/anxiety: This is the most concerning symptom. While recent evidence suggests bupropion may help anxiety in some MDD patients 6, the FDA label prioritizes safety concerns about emerging panic as a warning sign 1.

Critical Pitfalls to Avoid

1. Do not dismiss these symptoms as "adjustment period" effects. The FDA explicitly states these warrant immediate attention 1.

2. Do not add a benzodiazepine to manage anxiety without addressing the underlying issue. This masks the warning signs of clinical deterioration.

3. Do not continue bupropion if the patient reports seizure activity—this is an absolute contraindication to continuation 1.

4. Remember that bupropion toxicity can mimic other conditions (including alcohol withdrawal) and may require days for confirmatory testing 3.

Practical Next Steps

Schedule an urgent in-person visit (within 24-48 hours) to:

• Perform mental status examination
• Assess suicide risk using a validated tool
• Review medication adherence and dosing
• Check for drug interactions
• Obtain vital signs (tachycardia occurs in 5.5% with bupropion) 5

If you cannot see her urgently, instruct her to:

• Stop bupropion immediately if symptoms worsen
• Go to emergency department for suicidal thoughts, seizures, or severe agitation
• Have family monitor her closely

Document thoroughly that you assessed suicide risk and provided specific safety instructions, as this is a high-risk clinical scenario identified by the FDA 1.