Skip to Content

Atarax Side Effects

Generic Name: hydroxyzine

Note: This page contains information about the side effects of hydroxyzine. Some of the dosage forms included on this document may not apply to the brand name Atarax.

For the Consumer

Applies to hydroxyzine: oral capsules, oral suspension or solution, parenteral injection

Side effects include:

Drowsiness, dry mouth.

For Healthcare Professionals

Applies to hydroxyzine: compounding powder, intramuscular solution, oral capsule, oral suspension, oral syrup, oral tablet

Nervous system

Very common (10% or more): Drowsiness/somnolence
Common (1% to 10%): Headache
Uncommon (0.1% to 1%): Dizziness, attention disturbance
Rare (less than 0.1%): Tremor, convulsions
Frequency not reported: Psychomotor impairment, paresthesia, extrapyramidal effects, seizure, coma, ataxia, slurred speech, bitter taste in mouth, faintness, vertigo
Postmarketing reports: Sedation, dyskinesia/involuntary motor activity[Ref]


Common (1% to 10%): Dry mouth
Uncommon (0.1% to 1%): Constipation, nausea
Frequency not reported: Increased gastric reflux, diarrhea, epigastric pain, increased GI peristalsis
Postmarketing reports: Vomiting[Ref]


Common (1% to 10%): Fatigue
Uncommon (0.1% to 1%): Asthenia
Frequency not reported: Lassitude, weakness, tinnitus, labyrinthitis, chills
Postmarketing reports: Malaise, pyrexia[Ref]


Uncommon (0.1% to 1%): Insomnia
Frequency not reported: Sleep disturbances, depression, increased anxiety, nightmares, irritability
Postmarketing reports: Agitation, confusion, disorientation, hallucinations[Ref]


Frequency not reported: Palpitations, flushing, chest tightness
Postmarketing reports: QT interval prolongation, Torsade de Pointes and other ventricular arrhythmias, tachycardia, hypotension[Ref]


Frequency not reported: Hair loss, eczema
Postmarketing reports: Pruritus, rash (erythematous, maculo-papular), urticaria, dermatitis, angioneurotic edema, increased sweating, fixed drug eruption, acute generalized exanthematous pustulosis, erythema multiforme, Stevens-Johnson syndrome[Ref]


Frequency not reported: Dysuria
Postmarketing reports: Urinary retention[Ref]


Frequency not reported: Priapism, impotence, early menses[Ref]


Frequency not reported: Blood disorders (agranulocytosis, leucopenia, hemolytic anemia, thrombocytopenia)[Ref]


Frequency not reported: Liver dysfunction
Postmarketing reports: Abnormal liver function tests[Ref]


Frequency not reported: Prophyria, anorexia[Ref]


Frequency not reported: Angioedema
Postmarketing reports: Allergic reaction, hypersensitivity reaction, anaphylactic shock[Ref]


Frequency not reported: Myalgia[Ref]


Postmarketing reports: Accommodation disorder, blurred vision[Ref]


Frequency not reported: Thickened respiratory tract secretions, wheezing, nasal stuffiness, throat dryness
Postmarketing reports: Bronchospasm[Ref]


1. "Product Information. Vistaril (hydroxyzine)." Pfizer US Pharmaceuticals, New York, NY.

Not all side effects for Atarax may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.