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If your dog or cat may have swallowed an antidepressant, contact a veterinarian or emergency veterinary clinic now—even if your pet seems fine. Have the medication name and strength, how many tablets may be missing, and the approximate time of exposure ready. Do not wait for symptoms or try to treat your pet at home.
What to do after a suspected ingestion
- Call a veterinarian or emergency veterinary clinic immediately. Explain that an antidepressant may have been swallowed and follow the clinic’s directions about where and when to bring your pet.
- Gather the details. Share the medication name and strength, the possible number of missing tablets, the approximate exposure time, your pet’s species and weight, and any signs you have noticed. Bring the packaging if it is readily available.
- Follow professional guidance. A veterinarian may consult animal poison control for case-specific advice. Do not induce vomiting, give activated charcoal, or administer another medicine unless a veterinarian directs you to do so.
Prompt advice matters even when the amount is uncertain or the pet appears normal. There is no single safe-dose rule that applies to every antidepressant and every animal.
Why antidepressants can affect pets differently
“Antidepressant” describes several kinds of medicine, including tricyclic antidepressants (TCAs), monoamine oxidase inhibitors (MAOIs), selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and atypical antidepressants. Examples include fluoxetine (Prozac), sertraline (Zoloft), citalopram (Celexa), venlafaxine (Effexor), duloxetine (Cymbalta), and bupropion (Wellbutrin). ASPCA’s owner guidance describes these medicines and the risks of accidental exposure.
Some antidepressants are prescribed by veterinarians for particular animals and conditions. That does not make an accidental ingestion—or a dose beyond the one prescribed—safe. Risk depends on the particular drug and formulation, the amount involved, the animal’s size and health, and other case-specific factors. Pet Poison Helpline notes that multiple factors affect toxicity; its antidepressants guidance does not establish a universal safe amount.
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Signs of antidepressant toxicity
Possible signs include vomiting, drooling, agitation, restlessness, unusual sleepiness, enlarged pupils, or difficulty walking. More severe effects can involve tremors, elevated body temperature, abnormal heart rhythms or blood pressure, breathing difficulty, and seizures. Veterinary references also describe gastrointestinal signs, uncoordinated movement, shaking, and changes in heart rate. These signs are not a way to diagnose poisoning at home: signs vary, and their absence does not show that an exposure is harmless.
Serotonin syndrome
Excess serotonin activity is one possible emergency after some overdoses or combinations of medicines that affect serotonin. It can involve serious changes in movement, temperature, behavior, or body function. Do not try to identify or manage serotonin syndrome from an online symptom list; seek veterinary assessment.
Timing can vary
ASPCA says signs may appear within about 30 minutes, while extended-release formulations can delay signs for several hours. A delay is not a reason to watch and wait. Contact a veterinarian as soon as you suspect ingestion.
Why the specific medication matters
Different drug classes can affect the body in different ways, so a symptom pattern cannot reliably identify the medicine or determine how serious an exposure is. Merck Veterinary Manual notes, for example, that SSRIs may be associated with nystagmus (involuntary eye movement); venlafaxine exposures may involve rigidity, high blood pressure, and nystagmus; and tricyclic antidepressants can have anticholinergic and cardiac effects. These are clinical details, not a home diagnostic checklist.
Veterinary toxicology guidance also describes medication-specific differences in whether and when decontamination may be considered. Those decisions depend on the case and belong to veterinary professionals, alongside monitoring and supportive or symptom-directed care. The Merck Veterinary Manual review of human antidepressant toxicoses in animals is professional guidance, not a home-care protocol.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Preventing accidental exposure
- Keep medicines in secure cabinets or another place pets cannot access; a dedicated lockable medication box may help some households.
- Do not leave pills on counters, bedside tables, or in open bags.
- If you drop a pill, move pets out of the room, close the door, and locate it promptly before letting them back in.
For a broader overview of human prescription-drug poisoning in pets, see the Merck Veterinary Manual owner overview.
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