Is Amitriptyline safe for dogs and cats?
Moderate risk for petsAmitriptyline is used off-label in dogs for chronic pain, behavioral disorders (separation anxiety, obsessive behaviors), and feline idiopathic cystitis in cats (though this entry covers dogs); it is also used in veterinary medicine for neuropathic pain management. Veterinary dosing (dogs): 1–2 mg/kg once or twice daily for behavioral conditions; 0.5–1 mg/kg for neuropathic pain. Toxic dose: ASPCA APCC data indicate signs at approximately 5–15 mg/kg in dogs; serious cardiac toxicity at >25 mg/kg. Signs: anticholinergic (tachycardia, urinary retention, dry mucous membranes, ileus), CNS depression or stimulation, tremors; cardiac arrhythmias (QRS widening, ventricular arrhythmias) at higher doses. Cardiac risk: the sodium channel blocking property is the most dangerous aspect — dogs can develop ventricular arrhythmias requiring sodium bicarbonate treatment; ECG monitoring essential. Narrow therapeutic index: even at intended veterinary doses, individual variability means some dogs may show toxicity signs; periodic monitoring warranted. Comparison to newer antidepressants: amitriptyline is more dangerous per mg than SSRIs in dogs; most veterinary behaviorists now prefer SSRIs and SNRIs; amitriptyline use in behavioral medicine is declining.
What is amitriptyline?
The IUPAC name is N,N-dimethyl-3-(2-tricyclo[9.4.0.03,8]pentadeca-1(15),3,5,7,11,13-hexaenylidene)propan-1-amine.
Also known as: N,N-dimethyl-3-(2-tricyclo[9.4.0.03,8]pentadeca-1(15),3,5,7,11,13-hexaenylidene)propan-1-amine, Amitriptylin, Seroten, Damitriptyline.
- IUPAC name
- N,N-dimethyl-3-(2-tricyclo[9.4.0.03,8]pentadeca-1(15),3,5,7,11,13-hexaenylidene)propan-1-amine
- CAS number
- 50-48-6
- Molecular formula
- C20H23N
- Molecular weight
- 277.4 g/mol
- SMILES
- CN(C)CCC=C1C2=CC=CC=C2CCC3=CC=CC=C31
- PubChem CID
- 2160
Risk for dogs
Moderate riskAmitriptyline is used off-label in dogs for chronic pain, behavioral disorders (separation anxiety, obsessive behaviors), and feline idiopathic cystitis in cats (though this entry covers dogs); it is also used in veterinary medicine for neuropathic pain management. Veterinary dosing (dogs): 1–2 mg/kg once or twice daily for behavioral conditions; 0.5–1 mg/kg for neuropathic pain. Toxic dose: ASPCA APCC data indicate signs at approximately 5–15 mg/kg in dogs; serious cardiac toxicity at >25 mg/kg. Signs: anticholinergic (tachycardia, urinary retention, dry mucous membranes, ileus), CNS depression or stimulation, tremors; cardiac arrhythmias (QRS widening, ventricular arrhythmias) at higher doses. Cardiac risk: the sodium channel blocking property is the most dangerous aspect — dogs can develop ventricular arrhythmias requiring sodium bicarbonate treatment; ECG monitoring essential. Narrow therapeutic index: even at intended veterinary doses, individual variability means some dogs may show toxicity signs; periodic monitoring warranted. Comparison to newer antidepressants: amitriptyline is more dangerous per mg than SSRIs in dogs; most veterinary behaviorists now prefer SSRIs and SNRIs; amitriptyline use in behavioral medicine is declining.
Regulatory consensus
2 regulatory and scientific bodies have classified Amitriptyline. The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| FDA | — | Approved for depression | FDA-approved indication, though now predominantly used off-label for pain, migraine prophylaxis, and insomnia |
| American Geriatrics Society | — | Strongly avoid in adults ≥65 years | Beers Criteria recommendation due to anticholinergic burden |
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 amitriptyline
- 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 Amitriptyline:
-
Therapeutic alternatives (consult prescriber)
Trade-offs: Drug-specific. Cannot substitute without medical guidance.Relative cost: 1.2-2×
Frequently asked questions
Is amitriptyline safe for pets?
Amitriptyline is used off-label in dogs for chronic pain, behavioral disorders (separation anxiety, obsessive behaviors), and feline idiopathic cystitis in cats (though this entry covers dogs); it is also used in veterinary medicine for neuropathic pain management. Veterinary dosing (dogs): 1–2 mg/kg once or twice daily for behavioral conditions; 0.5–1 mg/kg for neuropathic pain. Toxic dose: ASPCA APCC data indicate signs at approximately 5–15 mg/kg in dogs; serious cardiac toxicity at >25 mg/kg. Signs: anticholinergic (tachycardia, urinary retention, dry mucous membranes, ileus), CNS depression or stimulation, tremors; cardiac arrhythmias (QRS widening, ventricular arrhythmias) at higher doses. Cardiac risk: the sodium channel blocking property is the most dangerous aspect — dogs can develop ventricular arrhythmias requiring sodium bicarbonate treatment; ECG monitoring essential. Narrow therapeutic index: even at intended veterinary doses, individual variability means some dogs may show toxicity signs; periodic monitoring warranted. Comparison to newer antidepressants: amitriptyline is more dangerous per mg than SSRIs in dogs; most veterinary behaviorists now prefer SSRIs and SNRIs; amitriptyline use in behavioral medicine is declining.
What products contain amitriptyline?
Amitriptyline appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).
See Amitriptyline in the pets app
Look up products containing amitriptyline, compare to alternatives, and explore the full data record.
Open in pets View raw API dataSources (2)
- FDA Prescribing Information: Amitriptyline (Elavil) — depression; TCA; QRS widening; sodium bicarbonate antidote; anticholinergic; Beers Criteria avoid ≥65yr; pain/migraine off-label; pediatric enuresis; narrow therapeutic index; CYP2D6 polymorphism (2023) (2023) — regulatory
- ASPCA Animal Poison Control Center: Tricyclic Antidepressant Toxicosis in Dogs — sodium channel blockade; cardiac arrhythmias; ECG monitoring; sodium bicarbonate treatment; anticholinergic toxidrome; toxic dose thresholds; comparison to SSRI toxicity (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 →