Clonidine Overdose: Symptoms, Risks For Children And What To To
How to spot a clonidine overdose, why children and used patches are a special risk, what to do right away, and clonidine brands and forms in five countries.
Yes, a clonidine overdose can be life-threatening. Too much clonidine can cause deep sleepiness, tiny pupils, a slow heartbeat, low blood pressure and slow or paused breathing, which can look a lot like an opioid overdose. Children are especially sensitive, even to a used skin patch. Call poison control or emergency services right away, even if the symptoms seem mild.
At a glance
- Symptoms of a clonidine overdose usually start within 30 to 60 minutes and can last 12 to 36 hours, according to StatPearls (NIH).
- Clonidine poisoning can “strongly resemble an opioid overdose,” StatPearls says, and Poison Control warns that naloxone (Narcan) “is not always effective.”
- Pediatric clonidine exposures reported to Florida’s poison center rose from 182 in 2002 to 378 in 2016, and 25% of the 3,444 children were admitted to intensive care.
- A used clonidine patch still holds medicine, and Poison Control warns that a child might find one “even from the trash.”
- In June 2026, an FDA compounding official presented six cases of children harmed by errors in compounded clonidine, including liquids made far stronger than prescribed.
- Stopping clonidine suddenly “can be life-threatening due to severe rebound hypertension,” StatPearls says, so never stop it without a doctor’s plan.
What is clonidine used for?
Clonidine is a blood pressure medicine known as an alpha-2 agonist. According to StatPearls (updated December 2025), its FDA-approved uses include high blood pressure, ADHD (extended-release forms only), tics in Tourette syndrome and severe cancer pain. Doctors also use it off-label to ease withdrawal from opioids, benzodiazepines and alcohol, and for anxiety and sometimes sleep problems.
It comes as tablets, extended-release tablets, a weekly skin patch (brand name Catapres-TTS) and, since the FDA approved Onyda XR on May 24, 2024, an extended-release liquid for ADHD. MedlinePlus lists the Catapres and Kapvay brands as no longer on the market in the US, though generic versions are sold. StatPearls says children are at particular risk, partly because these medicines are widely prescribed for ADHD.
What are the symptoms of a clonidine overdose?
MedlinePlus, the NHS and StatPearls list these signs:
- Extreme sleepiness or being hard to wake
- Small, pinpoint pupils
- Slow heartbeat
- Low blood pressure, dizziness or fainting
- Slow, shallow or paused breathing
- Cold, pale skin, shivering or low body temperature
- Confusion, slurred speech or weakness
- Vomiting or dry mouth
- Seizures or coma in severe cases
StatPearls notes that blood pressure can rise briefly at first before it drops. For signs that apply to any drug, see signs of an overdose.
Why does it look like an opioid overdose?
Both cause pinpoint pupils, deep sleepiness and slowed breathing. Poison Control says “many of the symptoms of clonidine or guanfacine toxicity resemble those seen in an opioid overdose.” Clonidine is not an opioid, though, so naloxone may help only partly or not at all. The CDC says “naloxone won’t harm someone if they’re overdosing on drugs other than opioids,” so if you can’t tell what someone took, give it and call for help. Learn more about opioid overdose and how to use Narcan.
How long does a clonidine overdose last?
StatPearls says symptoms usually begin within 30 to 60 minutes and can last 12 to 36 hours. Regular tablets peak in 2 to 4 hours. Extended-release forms (including Onyda XR) and patches release medicine more slowly, so problems can start later. Get help even if the person seems fine at first.
A clonidine overdose is not a harmless deep sleep: in the Florida poison center study, a quarter of children needed intensive care. With prompt care, most people recover.
What should you do if someone took too much clonidine?
- Call emergency services if the person is very hard to wake, is breathing slowly or not at all, has collapsed or has had a seizure.
- Give naloxone if you have it and aren’t sure what they took. It may not fully work, so don’t wait to see.
- If they’re awake and alert, call poison control now (1-800-222-1222 in the US). The NHS says to get urgent advice if “you or your child has taken more than your prescribed dose.”
- Remove any extra patches. MedlinePlus says to take off extra patches before calling poison control. If a child has a patch, take it away.
- Stay with them. If they’re drowsy but breathing, turn them on their side in the recovery position. Start CPR if they stop breathing and you’re trained.
- Don’t try home remedies. Coffee, a cold shower or making someone vomit won’t help and can waste time.
- Bring the bottle or patch box so the medical team knows the form and strength.
What happens in the hospital?
StatPearls says “there is no specific antidote for clonidine overdose, and treatment is primarily supportive.” Hospital teams watch the heart, blood pressure, breathing and body temperature. They may give oxygen or use a breathing tube, IV fluids, atropine for a slow heartbeat, and medicines to raise blood pressure. Doctors may try naloxone, and dialysis is unlikely to help.
Why are children at higher risk?
Poison Control says children “tend to be even more sensitive to the side effects than adults,” and that touching or chewing a patch can make a child sick. Children who handled patches “have experienced unconsciousness, lapses in breathing, low blood pressure, and slowed heart rate.” Any amount a child swallows or chews is a reason to call poison control right away.
- Used patches. “Don’t be fooled by thinking that a discarded patch doesn’t contain much medication,” Poison Control warns.
- Double doses. Poison Control says “hazardous side effects can occur even after an unintentional double-dose.” A written dose log helps when several adults give medicines.
- Compounded liquids. In an FDA presentation on June 24, 2026, a branch chief in the FDA’s compounding office described six cases of pharmacy-mixed clonidine, with calculation mistakes, the wrong starting ingredient and a refilled bottle that looked noticeably different. Children became unresponsive, and several needed a breathing tube. In August 2024, the Kentucky Board of Pharmacy reported three children hospitalized after a compounded clonidine error.
- Teens. The Florida study reported that “female intentional ingestions increased from 52 to 70%,” and StatPearls flags self-harm attempts among adolescents. If you or your teen is thinking about self-harm, the help box on this page lists crisis lines.
If a refill looks different from the last one, ask the pharmacist before giving it. Our guide on what to do if your refill looks different can help.
By the numbers: clonidine poisoning in children
How we did this: We compiled these figures from a Florida poison center study (2002 to 2016, published in the International Journal of Emergency Medicine in 2019), a 2014 to 2020 review summarized by StatPearls, an FDA presentation (June 24, 2026) and the Kentucky Board of Pharmacy (August 29, 2024).
| Measure | Figure | Source and period |
|---|---|---|
| Pediatric clonidine exposures | 3,444 | Florida poison center, 2002 to 2016 |
| Exposures per year | 182 in 2002, 378 in 2016 | Florida poison center |
| Rate per 100,000 children | 4.8 in 2002, 9.1 in 2016 | Florida poison center |
| Share under age 6 | 50.6% | Florida poison center |
| Admitted to intensive care | 25% overall; 31.4% of children under 6 | Florida poison center |
| Managed at home | 24% | Florida poison center |
| Deaths | None reported | Florida poison center |
| Slow heartbeat / low blood pressure | 72% / 69% of 111 poisonings | Review summarized by StatPearls, 2014 to 2020 |
| Severe slow heartbeat | 12%, more often in young children | Review summarized by StatPearls |
| Compounded clonidine case examples | 6 | FDA presentation, June 2026 |
| Children hospitalized after one pharmacy’s error | 3 | Kentucky Board of Pharmacy, August 2024 |
The Florida study found the rise held “despite adjustment for population growth,” and that younger children were more likely to need intensive care. No deaths were reported in the 15 years studied.
Clonidine brands and forms by country
Clonidine goes by different names and units around the world. The US and Canada label strengths in milligrams (mg); Australia and India use micrograms (mcg), and 100 mcg equals 0.1 mg.
| Country | Brands and forms we found | Main approved uses | Good to know |
|---|---|---|---|
| United States | Generic tablets, extended-release tablets and weekly patches; Onyda XR liquid (2024); Nexiclon XR | High blood pressure; ADHD (extended-release forms) | MedlinePlus lists Catapres, Kapvay and Jenloga as discontinued brands |
| Puerto Rico | Same FDA-approved products as the US | Same as the US | No separate local rule found |
| Canada | Generic clonidine tablets, 0.1 mg (white) and 0.2 mg (orange) in one maker’s monograph | High blood pressure | That monograph says use is not recommended under age 18 |
| Australia | Catapres 100 and 150 mcg; APO Clonidine and Clonidine Lupin 100 mcg | High blood pressure; migraine prevention and menopausal flushing | Catapres 150 mcg was in shortage from December 2025 to April 2026 |
| India | Arkamin 100 mcg tablets (Torrent) | High blood pressure | Labeled in micrograms |
How can you check what a clonidine pill is?
Several clonidine tablets we checked are plain white (Clonidine Lupin 100 mcg, for example, is marked YS 01), so they’re easy to confuse with other pills. Search the code stamped on the tablet with our pill imprint search, or see pictures of clonidine pills. If you find a loose pill near a child, read what to do if you find a pill and call poison control if it might have been swallowed. Fake pills can look identical to real ones, so a matching imprint doesn’t prove a pill is real.
Can you stop taking clonidine suddenly?
No. The NHS warns that stopping suddenly “can cause dangerously high blood pressure and withdrawal side effects,” such as restlessness, a pounding heartbeat, shaking, headaches and nausea. StatPearls says rare cases of stroke and death have been reported. Your doctor will lower the dose gradually.
StatPearls adds that in children, vomiting from a common illness can trigger this rebound, so call the doctor if your child can’t keep clonidine down. If you miss a dose, never take two doses at the same time.
The NHS lists sleeping tablets, anti-anxiety medicines and beta-blockers such as propranolol among medicines that interact with clonidine; beta-blockers with clonidine can slow the heart too much. Don’t mix clonidine with other sedating drugs or alcohol.
How do you dispose of clonidine patches safely?
MedlinePlus says to fold each used or unneeded patch “in half with the sticky sides together” and make sure it is “out of the reach of children.” Put it in a trash can children can’t open. Keep tablets and liquids in their original container, out of sight and reach, ideally locked. See how to dispose of unused medicines for take-back options.
Common questions
Can you overdose on a clonidine patch?
Yes. Wearing extra patches, or a child touching, chewing or swallowing a patch, can cause an overdose. MedlinePlus says to remove extra patches and call poison control. Used patches still contain medicine, so fold them sticky sides together before throwing them away.
Does Narcan work on clonidine?
Sometimes, but not reliably. Poison Control says naloxone “is not always effective” for clonidine, though it is often tried. The CDC says naloxone won’t harm someone who hasn’t taken opioids, so give it if you’re unsure and call emergency services.
What should I do if my child took clonidine by accident?
Call poison control right away (1-800-222-1222 in the US), even if your child seems fine. Call emergency services if your child is very sleepy, hard to wake or breathing slowly. Children are more sensitive to clonidine than adults.
Is clonidine an opioid?
No. Clonidine is an alpha-2 agonist, a type of blood pressure medicine, and doctors sometimes use it to ease opioid withdrawal. Its overdose can look like an opioid overdose, with pinpoint pupils and slowed breathing.
What happens if you take 2 clonidine by accident?
Poison Control says hazardous side effects can occur “even after an unintentional double-dose.” Call poison control or your doctor right away, and get emergency help for fainting, a very slow heartbeat or trouble breathing. Don’t drive yourself.
