Dog Ate Antidepressant, Anxiety or ADHD Pills: What to Do

Human antidepressant, anxiety, sleep and ADHD pills can poison a dog fast. Who to call now, which pills mean the ER and which signs matter.

Quick answer: If your dog ate any amount of an antidepressant, anxiety, sleep or ADHD pill, call ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661 now, even if it seems fine. ADHD stimulants, tricyclics, bupropion, MAOIs, mixed or unknown pills, or any sign mean an emergency vet now. The ASPCA says antidepressant signs can start within 30 minutes. Don't make your dog vomit unless a vet or poison line says to.

ASPCA Animal Poison Control: (888) 426-4435 (a consultation fee may apply). Pet Poison Helpline: (855) 764-7661 (a per-incident fee applies). Both poison lines take calls every day, including holidays.

This article is general information, not a diagnosis. If you think your pet is in danger, go to the nearest emergency animal hospital.

What should I do right now if my dog ate an antidepressant or ADHD pill?

If your dog ate a human antidepressant, anxiety, sleep or ADHD pill, call a pet poison line now, even if your dog seems fine, with the bottle, the strength on the label, the number of missing pills or opened capsules, the time and your dog's weight ready. The ASPCA says to seek veterinary care immediately, even if your pet appears normal. An ADHD stimulant, tricyclic, bupropion, MAOI, mixed or unknown pills, or any sign means an emergency vet now, calling a poison line on the way. Don't make your dog vomit unless a vet or poison line tells you to.

• Move pets out of the room and pick up every loose pill.
• Bring every bottle and any chewed pill organizer, and treat every missing pill as eaten.
• Check the other pets, and tell the line every medicine and supplement your pet takes.
• On the drive, keep an agitated or trembling pet in a quiet, dim space or carrier, and don't let it overheat or get chilled. During a seizure, keep your hands away from its mouth.

Which pills are most dangerous for a dog?

The most dangerous human mental-health pills for a dog are ADHD stimulants, tricyclics, bupropion and MAOIs; these, mixed or unknown pills, or any sign mean an emergency vet now, and any other antidepressant, anxiety or sleep pill means a poison-line call now. The ASPCA's Top 10 Toxins of 2025 ranks human prescription medications No. 3, with heart medications, antidepressants and ADHD medications the most often swallowed types.

"Emergency vet" means go now and call a poison line on the way. Any sign at all moves a row to Emergency vet.

Medicine	Main risk	Next step
SSRI pill	Serotonin signs	Poison line now
Venlafaxine	Agitation, tremor	Poison line now
Bupropion	Seizures	Emergency vet
Tricyclic	Heart rhythm	Emergency vet
MAOI	Late signs	Emergency vet
ADHD stimulant	Racing heart	Emergency vet
ADHD patch	Racing heart	Emergency vet
Atomoxetine	Fast heart	Poison line now
Alprazolam	Sedation	Poison line now
Sleep pill	Wobbling	Poison line now
Mixed pills	Serotonin	Emergency vet
Unknown pill	Unknown	Emergency vet

Common SSRIs and SNRIs include fluoxetine, sertraline, citalopram, escitalopram, venlafaxine and duloxetine; amitriptyline and nortriptyline are tricyclics; ADHD stimulants include amphetamine, methylphenidate and lisdexamfetamine. Bupropion is also sold as a quit-smoking pill, so the bottle may not look like an antidepressant.

The ASPCA says serotonin syndrome may occur with a large overdose or when more than one medicine that affects serotonin is involved, and an ASPCA Animal Poison Control Center toxicology brief calls it much harder to treat than a simple overdose.

How fast do signs start, and how long do they last?

The ASPCA says antidepressant signs in pets can start within 30 minutes or be delayed several hours with extended-release pills, and its ADHD guidance says stimulant signs can start within 15 minutes or hours later and last 24 to 72 hours. A dog that looks normal still needs the call, because there is no safe home-watch window.

• An ASPCA toxicology brief says bupropion can cause tremors and seizures within 1 to 4 hours, and a few MAOI cases show signs 12 to 24 hours later.
• For ADHD drugs, the Merck Veterinary Manual says extended-release, controlled-release and patch forms are absorbed more slowly and stay in the body longer. XR, ER, XL, SR, CR or LA on a label usually means a long-acting form.

Signs of antidepressant poisoning and serotonin syndrome

The ASPCA lists vomiting, drooling, agitation, restlessness, lethargy, dilated pupils and trouble walking as the first signs of antidepressant poisoning, and tremors, high body temperature, abnormal heart rhythm, changes in blood pressure, breathing trouble and seizures as more serious signs as poisoning progresses. The Merck Veterinary Manual adds that an overdose of almost any antidepressant can cause sleepiness and a fast or slow heart rate, so a quiet, sleepy dog has not been cleared.

No sign yet still means a poison-line call now. Any sign below means an emergency vet now, calling a poison line on the way.

Sign	Stage	Next step
Drooling, vomiting	Early	Emergency vet
Restless, big pupils	Early	Emergency vet
Wobbly walking	Early	Emergency vet
Very sleepy	Early	Emergency vet
Tremors, twitching	Advanced	Emergency vet
Hot to touch	Advanced	Emergency vet
Racing or slow heart	Advanced	Emergency vet
Slow breathing	Advanced	Emergency vet
Cold, weak	Advanced	Emergency vet
Seizure	Advanced	Emergency vet
Cat still, staring	Any	Emergency vet

Serotonin syndrome signs in a dog also include disorientation, vocalizing, muscle stiffness, high body temperature and diarrhea, per the ASPCA toxicology brief and the Merck Veterinary Manual. Tricyclics can leave a dog cold and sleepy: the Merck Veterinary Manual lists abnormal heart rhythms and high blood pressure, then deep sleepiness, low body temperature and slowed breathing, and the ASPCA brief says death can occur within 1 to 2 hours if signs are left untreated, so a tricyclic means you go now.

My dog ate an ADHD pill: why stimulants mean the ER now

Any ADHD stimulant means an emergency vet now, calling a poison line on the way, because the ASPCA says ADHD-medicine signs can start within 15 minutes and last 24 to 72 hours, and the Merck Veterinary Manual says even small amounts need emergency care. The guide to caffeine pills and coffee grounds in dogs gives the same rule for prescription stimulants.

The ASPCA says dogs on stimulants pace, circle and act restless, and Pet Poison Helpline adds panting, dilated pupils, a racing heart, overheating, tremors, seizures, vomiting and diarrhea, and warns that amphetamine poisoning can be fatal if treatment is delayed. A chewed ADHD patch counts as an ingestion.

Non-stimulant ADHD medicines are different drugs with their own risks; read the label or imprint to the poison line. A sleepy, weak or wobbly pet after any ADHD pill is still an emergency.

Anxiety and sleep pills: alprazolam, other benzodiazepines and sleep aids

Anxiety and sleep pills such as alprazolam and zolpidem can make a dog deeply sleepy and wobbly, but the ASPCA says sleep pills often do the opposite and leave a pet agitated, panting and overly active, and the Merck Veterinary Manual says this excitement also occurs, so call a poison line now and go to an emergency vet for any sign, especially if the dog cannot stand or breathes slowly.

For benzodiazepines, the Merck Veterinary Manual lists slowed breathing, wobbliness, weakness and vomiting. For sleep aids, Pet Poison Helpline says pets may become sedated or agitated, vomit or have heart changes. Confine a wobbly dog on the drive to the ER.

The Merck Veterinary Manual says melatonin generally has a wide margin of safety, but products made for people may contain 5-HTP or xylitol; any amount of a product with either means an emergency vet now, as this guide to melatonin, xylitol and 5-HTP in dogs explains.

Will my dog be OK after eating one pill?

A dog that ate a human antidepressant, anxiety or ADHD pill does best when a poison line or emergency vet is involved before signs start, and for ADHD stimulants the Merck Veterinary Manual says there is no antidote. The ASPCA says to seek veterinary care immediately, even if your pet appears normal, and its toxicology brief adds that SSRI overdoses, if treated promptly, have fewer heart effects and are much less likely to be fatal than tricyclic or MAOI overdoses.

In a study of 313 dogs reported to Pet Poison Helpline for an SSRI antidepressant exposure (Journal of Veterinary Emergency and Critical Care, 2012), most had no reported signs, but 37 of the 55 dogs whose care was tracked were hospitalized; the authors called the outlook excellent with veterinary attention.

Pet Poison Helpline says hospital care for stimulant poisoning can include decontamination when appropriate, IV fluids, sedation, cooling, and ECG and blood-pressure monitoring. No pet should wait, and small, young or senior pets and pets with heart, liver or kidney disease or a seizure history are at higher risk; the ASPCA toxicology brief says liver or kidney disease can interfere with a good outcome.

Cats: why a dropped capsule is riskier

The ASPCA says cats appear particularly attracted to venlafaxine capsules and that a cat on an ADHD stimulant may sit unusually still and stare while its heart rate and temperature rise, so a cat that may have eaten any of these pills needs a poison-line call now, even if it seems calm. A cat that hides or seems disoriented after a possible pill is showing a sign, not just being shy. An ADHD stimulant, tricyclic, bupropion, MAOI, mixed or unknown pills, or any sign in a cat means an emergency vet now.

The Merck Veterinary Manual says cats can be more sensitive to benzodiazepines. In a 2013 study of 33 cats that ate SSRI-type antidepressants, including venlafaxine (Journal of Veterinary Emergency and Critical Care), the authors concluded that decontamination and supportive care for at least 12 to 24 hours can be considered, particularly after venlafaxine; sedation was the most common sign.

When a video visit helps, and when it does not

A video visit cannot treat a pill poisoning, so a dog or cat that may have swallowed any amount of an antidepressant, anxiety, sleep or ADHD pill, including a dropped pill, an opened capsule or liquid medicine, needs a poison-line call now, and an emergency vet now for an ADHD stimulant, a tricyclic, bupropion, an MAOI, mixed or unknown pills, or any sign.

RexVet, a nonprofit online vet service, serves pets located in Florida, New York and Virginia by video visit. A $64.99 live video visit with a licensed RexVet vet, a veterinarian licensed in your pet's state, fits only after a poison line or emergency vet has handled the exposure and said home monitoring is fine (live slots run about 8 AM to 11 PM ET, when one is open). The veterinarian can go over that advice with you, help tell the after-effects the poison line or emergency vet said to expect apart from new or worsening signs that need the ER, check whether your pet's own medicines and supplements change the picture, watch walking, pupils and behavior on camera, say when a recheck is needed, and help you set up a pill-safety plan before guests arrive. It also fits when you are certain nothing was swallowed and want that pill-safety plan. For those cases, book a video visit.

It does not fit any suspected swallow of an ADHD stimulant, a tricyclic, bupropion, an MAOI, two or more such drugs or an unknown pill; any sign the poison line or emergency vet has not already cleared, such as vomiting, wobbling, heavy sleepiness, tremors, a racing heart, a seizure or collapse, or a cat that sits unusually still and stares; or a pet located outside those three states. A video visit cannot safely empty a pet's stomach, run an ECG or bloodwork, check blood pressure, cool the pet, start IV fluids or provide hospital monitoring.

No prescription is promised, and RexVet is not a pharmacy; a pharmacy transfer fee applies if a prescription is sent to an outside pharmacy. Under section 474.2021, Florida Statutes, a telehealth-only prescription is limited to FDA-approved animal drugs used as labeled, for up to 14 days (1 month for products labeled only for flea and tick control), and cannot be renewed without an in-person exam; human-labeled and controlled drugs need an in-person exam first. Federal rules (21 CFR 530.3) allow extralabel or human-drug use in animals only within an in-person veterinarian-client-patient relationship.

How to keep the next dropped pill away from pets

To protect dogs and cats, keep every human and pet medicine in a closed cabinet, and if a pill drops, the ASPCA says to move pets out of the room, close the door and find it right away. The ASPCA also says never to leave pills on counters, nightstands or in open bags.

• Before Thanksgiving and holiday visits, ask houseguests to keep medicine in a closed cabinet, not a bag or suitcase; these tips for keeping holiday visits calm for an anxious dog cover the rest.
• Hang coats, purses and school backpacks out of reach.
• Keep human and pet medicines on separate shelves.

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Frequently Asked Questions

Will one sertraline pill hurt my dog?

It can, so call a poison line now; the risk from one sertraline pill depends on its strength, your dog's size and other medicines. The ASPCA says to seek veterinary care immediately, even if your pet appears normal. Sertraline is an SSRI, and an ASPCA toxicology brief says SSRI overdoses, if treated promptly, are much less likely to be fatal than tricyclic or MAOI overdoses, so call early. Any sign means an emergency vet now.

My dog ate an ADHD pill but seems fine after two hours. Do I still need to go to the vet?

Yes. Go to an emergency vet now and call a poison line on the way, because long-acting ADHD pills can delay signs by several hours. The ASPCA says ADHD-medicine signs can start within 15 minutes or hours later, depending on the drug and its form. A dog that looks fine has not been cleared.

How long will my dog be affected after eating an antidepressant or ADHD pill?

It depends on the drug: the ASPCA says ADHD-medicine signs can last 24 to 72 hours once they start. In a 2012 study of SSRI cases reported to Pet Poison Helpline, hospitalized dogs stayed an average of 18.5 hours. There is no safe home-watch window: if your pet has not been checked yet, call a poison line now, and the treating vet decides when it can go home. Any new or worsening sign after coming home means back to the ER now.

Can a dog die from eating an antidepressant or ADHD pill?

Yes, it can happen, especially with tricyclics, MAOIs and ADHD stimulants, and fast veterinary care is what lowers the risk. A 2024 case report described a dog that died after eating lisdexamfetamine despite prompt treatment, so deaths are rare but reported even with care. Call a poison line now, and go to an emergency vet now for an ADHD stimulant, tricyclic, bupropion, MAOI, mixed or unknown pills, or any sign.

My dog takes prescribed fluoxetine and got an extra pill by accident. What should I do?

Call your dog's prescribing vet or a poison line now, before the next dose; an extra fluoxetine pill is still an overdose to report. Clomipramine, a dog behavior medicine, is a tricyclic and selegiline is an MAOI, so an extra dose of either means an emergency vet now, as does a human antidepressant, a cough medicine with dextromethorphan, or 5-HTP on top of a behavior medicine, because the mix raises the risk of serotonin syndrome. Any sign, such as restlessness, tremors, vomiting, wobbling or heavy sleepiness, means the ER now.

What if my dog ate a human pain pill like ibuprofen or acetaminophen?

Call a poison line now: human pain relievers are a separate poison. RexVet's guide to acetaminophen, ibuprofen and aspirin in dogs explains the signs and next steps.

Can I give my dog human ADHD or anxiety medicine to calm it down?

No. Never give a dog a person's ADHD, anxiety, sleep or antidepressant pills; a veterinarian decides whether a pet needs a behavior medicine, and which one. The Merck Veterinary Manual says even small amounts of ADHD drugs need emergency care. If your dog already swallowed one, call a poison line now.

Can an online vet help if my pet in Florida, New York or Virginia swallowed an antidepressant or ADHD pill?

No. A swallowed antidepressant, anxiety, sleep or ADHD pill needs a poison line or an emergency vet now, because decontamination, an ECG, IV fluids and monitoring need in-person care. After a poison line or emergency vet has handled the exposure and said home monitoring is fine, a licensed RexVet vet can review that advice on camera and help with a pill-safety plan. No prescription is promised. In Florida, section 474.2021 limits a telehealth-only prescription to FDA-approved animal drugs used as labeled, for up to 14 days (1 month for products labeled only for flea and tick control), with no renewal without an in-person exam, and human-labeled and controlled drugs need an in-person exam first. Virginia allows an electronic exam, though federal rules (21 CFR 530.3) still require an in-person veterinarian-client-patient relationship for extralabel or human-drug use. New York's rules are unsettled, so the veterinarian may require an in-person exam.