Hydroxyzine is an antihistamine available only with a prescription. It is used to treat symptoms of allergies and motion sickness.
Hydroxyzine overdose occurs when someone takes more than the normal or recommended amount of this medicine. This can be by accident or on purpose.
This article is for information only. DO NOT use it to treat or manage an actual overdose. If you or someone you are with has an overdose, call the local emergency number (such as 911), or the local poison control center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States.
Hydroxyzine can be harmful in large amounts.
Hydroxyzine is found in medicines with these names:
Other medicines may also contain hydroxyzine.
Dilated pupils are the classic symptom of a hydroxyzine overdose. Below are other symptoms of a hydroxyzine overdose in different parts of the body.
AIRWAYS AND LUNGS
BLADDER AND KIDNEYS
- Difficulty urinating
EYES, EARS, NOSE, THROAT, AND MOUTH
- Blurred vision
- Dry mouth
- Enlarged pupils
- Dry eyes
- Ringing in the ears
HEART AND BLOOD
- Rapid heartbeat
- Low blood pressure
- Pounding heartbeat (palpitations)
- Coma (decreased level of consciousness and lack of responsiveness)
- Hallucinations (seeing or hearing things that aren't there)
- Sleeping difficulties
- Uncoordinated movement
- Dry, red, or flushed skin
STOMACH AND INTESTINES
Before Calling Emergency
Have this information ready:
- Person's age, weight, and condition
- Name of the product (ingredients and strength, if known)
- Time it was swallowed
- Amount swallowed
- If the medicine was prescribed for the person
Your local poison control center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States. This national hotline will let you talk to experts in poisoning. They will give you further instructions.
This is a free and confidential service. All local poison control centers in the United States use this national number. You should call if you have any questions about poisoning or poison prevention. It does NOT need to be an emergency. You can call for any reason, 24 hours a day, 7 days a week.
What to Expect at the Emergency Room
Take the container to the hospital with you, if possible.
The health care provider will measure and monitor the person's vital signs, including temperature, pulse, breathing rate, and blood pressure.
Tests that may done include:
- Blood and urine tests
- Chest x-ray
- ECG (electrocardiogram or heart tracing)
- Fluids through a vein (by IV)
- Medicines to treat symptoms
- Activated charcoal
- Breathing support, including a tube through the mouth into the lungs and connected to a breathing machine (ventilator)
Recovery is likely if the person survives the first 24 hours. Complications such as pneumonia, muscle damage from lying on a hard surface for a prolonged period of time, or brain damage from lack of oxygen may cause permanent disability. Few people actually die from an antihistamine overdose, unless they have serious heart rhythm disturbances or breathing problems.
Keep all medicines in child-proof bottles and out of reach of children.
Aronson JK. Anticholinergic drugs. In: Aronson JK, ed. Meyler's Side Effects of Drugs. 16th ed. Waltham, MA: Elsevier; 2016:534-539.
Monte AA, Hoppe JA. Anticholinergics. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 145.
Last reviewed on: 11/13/2021
Reviewed by: Jesse Borke, MD, CPE, FAAEM, FACEP, Attending Physician at Kaiser Permanente, Orange County, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.