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Is Sertraline Toxic to Dogs? Safety and What to Do

PawAI Lab
7 min read

Learn whether sertraline poses a toxicity risk to dogs, how this SSRI medication affects them, and what steps a veterinarian may recommend after accidental ingestion.

Quick Answer

Sertraline is an SSRI antidepressant that may be harmful to dogs when ingested in overdose. It can cause lethargy, agitation, gastrointestinal upset, tremors, seizures, and a serious condition called serotonin syndrome. If your dog ate sertraline, contact a veterinarian or an animal poison-control service promptly, even if your dog appears well at this time.

Before using any tool, contact a veterinary professional if your dog may have eaten sertraline.

  • US: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • UK: Animal PoisonLine (01202 509000) or your nearest veterinary emergency clinic
  • Canada: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • AU: Animal Emergency Centre or your regular vet
  • EU: Contact your nearest veterinary emergency service

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Safety Verdict

Potentially Harmful. Sertraline is a selective serotonin reuptake inhibitor (SSRI), a class of antidepressant that increases the amount of serotonin available in the nervous system. It is used in people to treat depression, anxiety, and related conditions. While SSRIs share a similar mechanism, sertraline is not as commonly prescribed in veterinary medicine as some other medications in this class. When a dog ingests more than the intended dose, or consumes a human formulation, the medication may cause unwanted and potentially serious effects.

The main concern with sertraline overdose in dogs is excess serotonin activity. At higher doses, too much serotonin can lead to a condition called serotonin syndrome, which may involve elevated body temperature, muscle rigidity, tremors, and changes in mental state. Sertraline also has a similar risk profile to other SSRIs such as fluoxetine, meaning the types of signs and concerns overlap.

What Should the Owner Do Now?

  1. Contact a veterinarian or animal poison-control service immediately. Professional guidance can help determine whether the amount ingested is likely to cause concern.
  2. Do not induce vomiting unless a veterinarian or poison-control professional directly instructs you to do so. Improper induction can cause additional harm.
  3. Collect relevant information (see the section below) so the veterinary team can assess the situation accurately.
  4. Do not give food, milk, salt, charcoal, or any home remedy. These are not proven treatments and may interfere with veterinary care.
  5. Keep your dog calm and monitored while you await professional advice, and prevent access to stairs or areas where tremors or disorientation could cause injury.

Even if your dog seems normal right now, professional consultation is still recommended because neurological signs and serotonin effects may take time to develop.

What Signs May Occur?

Signs of sertraline ingestion in dogs may begin within a few hours of exposure. Not every dog will show the same signs, and the absence of early symptoms does not necessarily rule out risk.

Possible signs may include:

  • Lethargy or unusual drowsiness
  • Agitation or restlessness
  • Vomiting or diarrhea
  • Reduced appetite
  • Drooling

In cases involving larger amounts, more serious signs may occur:

  • Tremors
  • Seizures
  • Elevated body temperature (hyperthermia)
  • Muscle rigidity
  • Changes in mental state

When excess serotonin causes serotonin syndrome, signs may include a combination of tremors, rigidity, elevated body temperature, and agitation. This is a serious condition that requires urgent veterinary attention.

What Information Should Be Ready?

When you contact a veterinarian or poison-control service, having the following details available can help them assess the situation more efficiently:

  • Dog's details: species, breed, approximate age, and body weight
  • Medication name: sertraline, and the brand name if known (e.g., Zoloft)
  • Strength and formulation: milligram strength per tablet, and whether it is a tablet or liquid
  • Estimated amount ingested: best guess of how many tablets were consumed
  • Time of ingestion: when the exposure occurred, or the window of time during which it may have happened
  • Current symptoms: any lethargy, agitation, tremors, vomiting, or changes in body temperature
  • Packaging: the prescription label and any remaining product
  • Medical history: any pre-existing seizures, behavioral conditions, current medications, or other health conditions

Provide honest estimates rather than precise numbers. The veterinary team can work with approximate information to determine the best course of action.

Differences That May Affect Risk

Sertraline risk in dogs is influenced by several factors:

  • Dose relative to body weight: A given number of milligrams may affect a small dog more than a large dog, but risk depends on the dose relative to weight rather than the number of tablets alone.
  • Other medications: Dogs already taking other antidepressants or serotonin-affecting drugs may be at greater risk of serotonin syndrome.
  • Seizure history: Dogs with a history of seizures may be more vulnerable to neurological effects.
  • Liver function: Sertraline is processed by the liver, so dogs with liver disease may be more sensitive to its effects.

Because of these variables, any known or suspected ingestion should be discussed with a veterinarian rather than assessed at home.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service immediately if your dog has eaten sertraline. Do not wait for symptoms to appear.

Emergency signs that require urgent veterinary attention include:

  • Seizures or tremors
  • Elevated body temperature or panting
  • Muscle rigidity
  • Marked agitation or restlessness
  • Collapse or inability to stand

Non-urgent follow-up: If ingestion occurred hours ago and your dog appears normal, veterinary consultation is still recommended to confirm whether monitoring or treatment is needed.

FAQ

Is sertraline ever given to dogs?

Sertraline is an SSRI antidepressant that is less commonly used in veterinary medicine than some other medications in its class, but it may be prescribed by veterinarians in specific cases at controlled doses. The risk discussed here concerns accidental ingestion or overdose of human medication, not a supervised veterinary prescription.

What is serotonin syndrome in dogs?

Serotonin syndrome is a serious condition that can occur when there is too much serotonin activity in the nervous system. It may involve elevated body temperature, muscle rigidity, tremors, and changes in mental state. It is a known risk with SSRI overdose, including sertraline, and requires urgent veterinary attention.

How much sertraline is toxic to a dog?

There is no single universal toxic dose for all dogs, because risk depends on body weight, liver function, and individual sensitivity. Rather than estimating a threshold at home, contact a veterinarian or poison-control service with the strength and amount ingested so they can assess the specific situation.

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Disclaimer

This article and the PawAI Toxicity Checker provide general safety information and cannot determine an individual pet's toxicity risk or replace a veterinarian or animal poison-control service. If exposure may have occurred, contact an appropriate professional promptly, even if your pet appears well.

Written by PawAI Lab