Pet Safety / Compounds / Escitalopram (Lexapro)

Is Escitalopram (Lexapro) safe for dogs and cats?

Moderate risk for pets

Escitalopram is considered by some veterinary pharmacologists to be the SSRI most likely to cause serotonin syndrome in dogs at relatively low doses — clinical reports suggest dogs may be more sensitive to escitalopram's serotonergic effects than to sertraline or fluoxetine at equivalent doses. Toxic dose: ASPCA APCC data suggest signs possible in dogs at ≥5 mg/kg; moderate-severe signs at 10–25 mg/kg. Serotonin syndrome signs: hyperthermia (sometimes >40°C), severe tremors, muscle rigidity, tachycardia, diarrhea, vomiting — the presentation is often more acute and severe than with some other SSRIs. QT effects: the cardiac QT signal is theoretically relevant in dogs with pre-existing cardiac disease on antiarrhythmics; ECG monitoring warranted in high-risk dogs. Citalopram comparison: both citalopram and escitalopram are toxic; escitalopram has twice the serotonergic potency of racemic citalopram at the same mg dose. Treatment: prompt decontamination if early; cyproheptadine 1.1 mg/kg; aggressive temperature management for hyperthermia; methocarbamol for tremors; IV fluids; cardiac monitoring. Prognosis: generally good with early treatment; dogs that develop significant hyperthermia (>41°C) have worse outcomes.

What is escitalopram (lexapro)?

The IUPAC name is (1S)-1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-3H-2-benzofuran-5-carbonitrile.

Also known as: (1S)-1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-3H-2-benzofuran-5-carbonitrile, Escitalopram, (S)-Citalopram, S(+)-Citalopram.

IUPAC name
(1S)-1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-3H-2-benzofuran-5-carbonitrile
CAS number
128196-01-0
Molecular formula
C20H21FN2O
Molecular weight
324.4 g/mol
SMILES
CN(C)CCCC1(C2=C(CO1)C=C(C=C2)C#N)C3=CC=C(C=C3)F
PubChem CID
146570

Risk for dogs

Moderate risk

Escitalopram is considered by some veterinary pharmacologists to be the SSRI most likely to cause serotonin syndrome in dogs at relatively low doses — clinical reports suggest dogs may be more sensitive to escitalopram's serotonergic effects than to sertraline or fluoxetine at equivalent doses. Toxic dose: ASPCA APCC data suggest signs possible in dogs at ≥5 mg/kg; moderate-severe signs at 10–25 mg/kg. Serotonin syndrome signs: hyperthermia (sometimes >40°C), severe tremors, muscle rigidity, tachycardia, diarrhea, vomiting — the presentation is often more acute and severe than with some other SSRIs. QT effects: the cardiac QT signal is theoretically relevant in dogs with pre-existing cardiac disease on antiarrhythmics; ECG monitoring warranted in high-risk dogs. Citalopram comparison: both citalopram and escitalopram are toxic; escitalopram has twice the serotonergic potency of racemic citalopram at the same mg dose. Treatment: prompt decontamination if early; cyproheptadine 1.1 mg/kg; aggressive temperature management for hyperthermia; methocarbamol for tremors; IV fluids; cardiac monitoring. Prognosis: generally good with early treatment; dogs that develop significant hyperthermia (>41°C) have worse outcomes.

Regulatory consensus

1 regulatory bodyhas classified Escitalopram (Lexapro).

AgencyYearClassificationNotes
FDA2012Approved for MDD and GAD in adults2012 safety communication limiting maximum dose to 20 mg/day due to QT prolongation

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 escitalopram (lexapro)

  • 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 Escitalopram (Lexapro):

  • Alternative drug class; Non-pharmacological therapy; Lowest effective dose
    Trade-offs: Direct chemical substitution requires verification that the replacement does not introduce new hazards (regrettable substitution). Conduct full hazard assessment of proposed alternative before adoption.
    Relative cost: 1.2-2×

Frequently asked questions

Is escitalopram (lexapro) safe for pets?

Escitalopram is considered by some veterinary pharmacologists to be the SSRI most likely to cause serotonin syndrome in dogs at relatively low doses — clinical reports suggest dogs may be more sensitive to escitalopram's serotonergic effects than to sertraline or fluoxetine at equivalent doses. Toxic dose: ASPCA APCC data suggest signs possible in dogs at ≥5 mg/kg; moderate-severe signs at 10–25 mg/kg. Serotonin syndrome signs: hyperthermia (sometimes >40°C), severe tremors, muscle rigidity, tachycardia, diarrhea, vomiting — the presentation is often more acute and severe than with some other SSRIs. QT effects: the cardiac QT signal is theoretically relevant in dogs with pre-existing cardiac disease on antiarrhythmics; ECG monitoring warranted in high-risk dogs. Citalopram comparison: both citalopram and escitalopram are toxic; escitalopram has twice the serotonergic potency of racemic citalopram at the same mg dose. Treatment: prompt decontamination if early; cyproheptadine 1.1 mg/kg; aggressive temperature management for hyperthermia; methocarbamol for tremors; IV fluids; cardiac monitoring. Prognosis: generally good with early treatment; dogs that develop significant hyperthermia (>41°C) have worse outcomes.

What products contain escitalopram (lexapro)?

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

See Escitalopram (Lexapro) in the pets app

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

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Sources (2)
  1. FDA Prescribing Information: Escitalopram (Lexapro) — MDD/GAD; Black Box suicidality; QT prolongation 20mg limit; minimal CYP interactions; pediatric MDD ≥12yr; 2012 QT safety communication; S-enantiomer of citalopram (2023) (2023) — regulatory
  2. ASPCA Animal Poison Control Center: SSRI/SNRI Toxicosis in Dogs and Cats — serotonin syndrome; cyproheptadine treatment; toxic dose thresholds; fluoxetine/sertraline/paroxetine/escitalopram comparison; clinical signs and management (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 →