What should I watch for?
Tell your doctor or health care professional if your symptoms do not improve.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.
Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your doctor if the problem does not go away or is severe.
This medicine may cause dry eyes and blurred vision. If you wear contact lenses you may feel some discomfort. Lubricating drops may help. See your eye doctor if the problem does not go away or is severe.
If you are receiving skin tests for allergies, tell your doctor you are using this medicine.
Common and Rare Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Less common or rare
Abdominal or stomach pain
clay-colored stools or dark urine
fast or irregular heartbeat
puffiness or swelling of the eyelids or around the eyes, face, lips or tongue
redness of skin
shortness of breath
tightness in chest
unusual tiredness or weakness
Check with your doctor as soon as possible if any of the following side effects occur:
Symptoms of overdose
Clumsiness or unsteadiness
dryness of mouth, nose, or throat (severe)
flushing or redness of face
hallucinations (seeing, hearing, or feeling things that are not there)
shortness of breath or troubled breathing
trouble in sleeping
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
dry mouth, nose, or throat
increased appetite and weight gain
thickening of mucus
Less common or rare
Acid or sour stomach
blurred vision or any change in vision
body aches or pain
clumsiness or unsteadiness
confusion (not with diphenhydramine)
difficult or painful urination
difficulty in moving
difficult or painful menstruation
dizziness (not with brompheniramine or hydroxyzine)
dryness of mouth, nose, or throat
increased sensitivity of skin to sun
loss of appetite
muscle aching or cramping
muscle pains or stiffness
ringing or buzzing in ears
stomach discomfort, upset or pain
tender swollen glands in neck
unusual excitement, nervousness, restlessness, or irritability
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.