DIPHENHYDRAMINE (dye fen HYE dra meen) is an antihistamine. It is used to treat the symptoms of an allergic reaction. It is also used to treat Parkinson's disease. This medicine is also used to prevent and to treat motion sickness and as a nighttime sleep aid.
Take this medicine by mouth with a full glass of water. Follow the directions on the prescription label. Take your doses at regular intervals. Do not take your medicine more often than directed. To prevent motion sickness start taking this medicine 30 to 60 minutes before you leave.
Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.
Patients over 65 years old may have a stronger reaction and need a smaller dose.
Side effects that you should report to your doctor or health care professional as soon as possible:
allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
changes in vision
confused, agitated, nervous
irregular or fast heartbeat
trouble passing urine
unusual bleeding or bruising
unusually weak or tired
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
loss of appetite
stomach upset, vomiting
Do not take this medicine with any of the following medications:
MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
This medicine may also interact with the following medications:
barbiturates, like phenobarbital
medicines for bladder spasm like oxybutynin, tolterodine
medicines for blood pressure
medicines for depression, anxiety, or psychotic disturbances
medicines for movement abnormalities or Parkinson's disease
medicines for sleep
other medicines for cold, cough or allergy
some medicines for the stomach like chlordiazepoxide, dicyclomine
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
Keep out of the reach of children.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Keep container closed tightly. Throw away any unused medicine after the expiration date.
They need to know if you have any of these conditions:
asthma or lung disease
high blood pressure or heart disease
pain or difficulty passing urine
ulcers or other stomach problems
an unusual or allergic reaction to diphenhydramine, other medicines foods, dyes, or preservatives such as sulfites
pregnant or trying to get pregnant
Visit your doctor or health care professional for regular check ups. Tell your doctor if your symptoms do not improve or if they get worse.
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.
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.