Health Library: ABCDEFGHIJKLMNOPQRSTUVWXYZ

Dimenhydrinate Chewable tablet

What is this medicine?

DIMENHYDRINATE (dye men HYE dri nate) is an antihistamine. It is used to prevent and to treat the nausea, vomiting, or dizziness of motion sickness.

How should I use this medicine?

Take this medicine by mouth with a glass of water. Chew this medicine or take whole. Follow the directions on the prescription label. To prevent motion sickness start taking this medicine 1/2 to 1 hour before you travel. Take your medicine at regular intervals. Do not take it more often than directed.

Talk to your pediatrician regarding the use of this medicine in children. While this drug may be prescribed for children as young as 2 years old for selected conditions, precautions do apply.

Patients over 65 years old may have a stronger reaction and need a smaller dose.

What side effects may I notice from receiving this medicine?

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, or nervous

  • fast, irregular heartbeat

  • feeling faint or lightheaded, falls

  • ringing in the ears

  • tremor

  • trouble passing urine or change in the amount of 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):

  • constipation or diarrhea

  • dry mouth

  • headache

  • loss of appetite

  • stomach upset, vomiting

What may interact with this medicine?

  • alcohol

  • MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate

  • some medicines for allergies, cold, or cough

  • medicines that make you sleepy

What if I miss a dose?

If you miss a dose, use it as soon as you can. If it is almost time for your next dose, use only that dose. Do not use double or extra doses.

Where should I keep my medicine?

Keep out of the reach of children.

Store at room temperature between 15 and 25 degrees C (59 and 77 degrees F). Do not freeze. Throw away any unused medicine after the expiration date.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:

  • glaucoma

  • heart disease

  • liver disease

  • lung or breathing disease, like asthma or emphysema

  • pain or trouble passing urine

  • phenylketonuria

  • porphyria

  • prostate trouble

  • seizures

  • an unusual or allergic reaction to dimenhydrinate, diphenhydramine, tartrazine, other medicines, foods, dyes, or preservatives

  • pregnant or trying to get pregnant

  • breast-feeding

What should I watch for while using this medicine?

Visit your doctor or health care professional for regular check ups. Tell your doctor or health care professional if your symptoms do not start to get better 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.