Pet Safety / Compounds / Bupropion (Wellbutrin)

Is Bupropion (Wellbutrin) safe for dogs and cats?

High risk for pets

Bupropion is one of the most dangerous human antidepressants for dogs — it consistently causes seizures at relatively low doses, well within the range achievable by a dog ingesting 1–3 tablets. The mechanism (NE/DA reuptake inhibition rather than serotonergic) means that traditional SSRI antidotes (cyproheptadine) are ineffective; treatment is primarily seizure management. Toxic dose: ASPCA APCC data indicate tremors and agitation at doses as low as 5–10 mg/kg; seizures common at 10–25 mg/kg; severe toxicity at >25 mg/kg. Signs: agitation, tremors, tachycardia, hypertension, mydriasis, vocalization progressing to tonic-clonic seizures; vomiting and diarrhea common early; onset typically within 1–4 hours. Extended-release: Wellbutrin SR (12-hr) and XL (24-hr) formulations have delayed and prolonged onset; dogs may appear initially normal and then develop severe seizures 4–8 hours post-ingestion; minimum 12–24 hour monitoring required for any XL ingestion. Treatment: prompt emesis/activated charcoal; benzodiazepines (diazepam, midazolam) for seizure management — first-line; IV levetiracetam as second-line; phenobarbital if refractory; IV fluids; thermoregulation; heart rate/BP management. Fatalities: bupropion causes canine fatalities more frequently than SSRIs; rapid veterinary care is essential. Flavor: bupropion tablets may be attractively flavored or smell appealing to dogs.

What is bupropion (wellbutrin)?

The IUPAC name is 2-(tert-butylamino)-1-(3-chlorophenyl)propan-1-one.

Also known as: 2-(tert-butylamino)-1-(3-chlorophenyl)propan-1-one, bupropion, Amfebutamone, Amfebutamon.

IUPAC name
2-(tert-butylamino)-1-(3-chlorophenyl)propan-1-one
CAS number
34841-39-9
Molecular formula
C13H18ClNO
Molecular weight
239.74 g/mol
SMILES
CC(C(=O)C1=CC(=CC=C1)Cl)NC(C)(C)C
PubChem CID
444

Risk for dogs

High risk

Bupropion is one of the most dangerous human antidepressants for dogs — it consistently causes seizures at relatively low doses, well within the range achievable by a dog ingesting 1–3 tablets. The mechanism (NE/DA reuptake inhibition rather than serotonergic) means that traditional SSRI antidotes (cyproheptadine) are ineffective; treatment is primarily seizure management. Toxic dose: ASPCA APCC data indicate tremors and agitation at doses as low as 5–10 mg/kg; seizures common at 10–25 mg/kg; severe toxicity at >25 mg/kg. Signs: agitation, tremors, tachycardia, hypertension, mydriasis, vocalization progressing to tonic-clonic seizures; vomiting and diarrhea common early; onset typically within 1–4 hours. Extended-release: Wellbutrin SR (12-hr) and XL (24-hr) formulations have delayed and prolonged onset; dogs may appear initially normal and then develop severe seizures 4–8 hours post-ingestion; minimum 12–24 hour monitoring required for any XL ingestion. Treatment: prompt emesis/activated charcoal; benzodiazepines (diazepam, midazolam) for seizure management — first-line; IV levetiracetam as second-line; phenobarbital if refractory; IV fluids; thermoregulation; heart rate/BP management. Fatalities: bupropion causes canine fatalities more frequently than SSRIs; rapid veterinary care is essential. Flavor: bupropion tablets may be attractively flavored or smell appealing to dogs.

Regulatory consensus

2 regulatory and scientific bodies have classified Bupropion (Wellbutrin). The classifications differ — that's the data.

AgencyYearClassificationNotes
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 2 positive / 0 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 2 positive / 0 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where pets encounter bupropion (wellbutrin)

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Bupropion (Wellbutrin):

  • Therapeutic alternatives (consult prescriber)
    Trade-offs: Drug-specific. Cannot substitute without medical guidance.
    Relative cost: 1.2-2×

Frequently asked questions

Is bupropion (wellbutrin) safe for pets?

Bupropion is one of the most dangerous human antidepressants for dogs — it consistently causes seizures at relatively low doses, well within the range achievable by a dog ingesting 1–3 tablets. The mechanism (NE/DA reuptake inhibition rather than serotonergic) means that traditional SSRI antidotes (cyproheptadine) are ineffective; treatment is primarily seizure management. Toxic dose: ASPCA APCC data indicate tremors and agitation at doses as low as 5–10 mg/kg; seizures common at 10–25 mg/kg; severe toxicity at >25 mg/kg. Signs: agitation, tremors, tachycardia, hypertension, mydriasis, vocalization progressing to tonic-clonic seizures; vomiting and diarrhea common early; onset typically within 1–4 hours. Extended-release: Wellbutrin SR (12-hr) and XL (24-hr) formulations have delayed and prolonged onset; dogs may appear initially normal and then develop severe seizures 4–8 hours post-ingestion; minimum 12–24 hour monitoring required for any XL ingestion. Treatment: prompt emesis/activated charcoal; benzodiazepines (diazepam, midazolam) for seizure management — first-line; IV levetiracetam as second-line; phenobarbital if refractory; IV fluids; thermoregulation; heart rate/BP management. Fatalities: bupropion causes canine fatalities more frequently than SSRIs; rapid veterinary care is essential. Flavor: bupropion tablets may be attractively flavored or smell appealing to dogs.

What products contain bupropion (wellbutrin)?

Bupropion (Wellbutrin) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

See Bupropion (Wellbutrin) in the pets app

Look up products containing bupropion (wellbutrin), compare to alternatives, and explore the full data record.

Open in pets View raw API data

Sources (2)
  1. FDA Prescribing Information: Bupropion (Wellbutrin/Zyban/Aplenzin) — MDD/SAD/smoking cessation; seizure risk; eating disorder contraindication; NDRI mechanism; no sexual dysfunction; no weight gain; CYP2B6 metabolism; extended-release formulations; neuropsychiatric warning history (2023) (2023) — regulatory
  2. ASPCA Animal Poison Control Center: Bupropion Toxicosis in Dogs — high seizure risk; extended-release delayed onset; benzodiazepine treatment; toxic dose thresholds; canine fatalities; comparison to SSRI profile; management protocol (2023) (2023) — veterinary

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →