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Dimenhydrinate may increase the effects of other drugs that cause drowsiness, including antidepressants, alcohol, antihistamines, sedatives (used to treat insomnia), pain relievers, anxiety medicines, and muscle relaxants. Tell your doctor about all medicines that you are taking, and do not take any medicine unless your doctor approves.

Drugs other than those listed here may also interact with dimenhydrinate. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines.

Stop taking dimenhydrinate and seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives).

Other, less serious side effects may be more likely to occur. Continue to take dimenhydrinate and talk to your doctor if you experience

• drowsiness or dizziness;

• restlessness, excitation, nervousness, or insomnia;

• blurred or double vision;

• dry mouth, nose, or throat;

• decreased appetite, nausea, vomiting, or diarrhea;

• difficulty urinating; or

• an irregular or fast heartbeat.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.