• you are allergic to any ingredient in Atarax
• you are taking sodium oxybate (GHB)
• you are in the first trimester of pregnancy.

Contact your doctor or health care provider right away if any of these apply to you.

Some medical conditions may interact with Atarax. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have asthma, glaucoma, difficulty urinating, urinary or intestinal blockage, a prostate disease, or a blood disease
• if you drink alcoholic beverages.

Some medicines may interact with Atarax. Tell your health care provider if you are taking any other medicines, especially any of the following:

• Sodium oxybate (GHB) because side effects such as an increase in sleep duration and slowed breathing may occur.

This may not be a complete list of all interactions that may occur. Ask your health care provider if Atarax may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

Important safety information:

• Atarax may cause drowsiness. These effects may be worse if you take it with alcohol or certain medicines. Use Atarax with caution. Do not drive or perform other possible unsafe tasks until you know how you react to it.
• Avoid drinking alcohol or using medicines that may cause drowsiness (eg, sleep aids, muscle relaxers) while you are using Atarax; it may add to their effects. Ask your pharmacist if you have questions about which medicines may cause drowsiness.
• The effectiveness of Atarax as anxiety treatment for longer than 4 months is not known.
• Use Atarax with caution in the elderly; they may be more sensitive to its effects.
• Atarax should not be used in newborns; safety and effectiveness in newborns have not been confirmed.
• Pregnancy and breast-feeding: Do not use Atarax if you are in the first trimester of pregnancy. If you think you may be pregnant, contact your doctor right away. It is not known if Atarax is found in breast milk. Do not breastfeed while taking Atarax.

Check with your doctor if any of these most common side effects persist or become bothersome:

Drowsiness; dry mouth.

Seek medical attention right away if any of these severe side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); involuntary movements.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider.