Chlorpheniramine is an antihistamine. Dextromethorphan is a cough suppressant.

Dimetapp Long Acting Cough Plus Cold is a combination medicine used to treat sneezing, runny nose, and cough caused by the common cold.

Dimetapp Long Acting Cough Plus Cold may also be used for purposes not listed in this medication guide.

Do not use this medicine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.

Do not use cough or cold medicine to make a child sleepy.

Use exactly as directed on the label, or as prescribed by your doctor. Cough or cold medicine is only for short-term use until your symptoms clear up.

Always follow directions on the medicine label about giving cough or cold medicine to a child. Do not use the medicine only to make a child sleepy. Death can occur from the misuse of cough or cold medicines in very young children.

Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).

You must chew the chewable tablet before you swallow it.

Call your doctor if your symptoms do not improve after 7 days, or if you have a fever, rash, or headaches.

If you need surgery or medical tests, tell your surgeon or doctor if you are currently using this medicine.

Store at room temperature away from moisture and heat. Do not freeze.

Do not use Dimetapp Long Acting Cough Plus Cold if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.

You should not use this medicine if you are allergic to chlorpheniramine or dextromethorphan.

Ask a doctor or pharmacist if this medicine is safe to use if you have:

• glaucoma;

• an enlarged prostate;

• urination problems; or

• a cough with mucus, or cough caused by smoking, asthma, emphysema, or chronic bronchitis.

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

This medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).

Since cough or cold medicine is used when needed, you may not be on a dosing schedule. Skip any missed dose if it's almost time for your next dose. Do not use two doses at one time.

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Avoid driving or hazardous activity until you know how Dimetapp Long Acting Cough Plus Cold will affect you. Your reactions could be impaired.

Avoid drinking alcohol while taking this medicine.

Ask a doctor or pharmacist before using other cough or cold medicines that may contain similar ingredients.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using Dimetapp Long Acting Cough Plus Cold and call your doctor at once if you have severe drowsiness.

Side effects such as dry mouth, constipation, and confusion may be more likely in older adults.

Common side effects of Dimetapp Long Acting Cough Plus Cold may include:

• dizziness, drowsiness;

• dry mouth, nose, or throat;

• constipation;

• blurred vision; or

• feeling restless or excited (especially in a child).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Avoid using this medicine with other drugs that cause drowsiness or slow your breathing (such as opioid medicine, a muscle relaxer, or medicine for anxiety or seizures). Ask a doctor or pharmacist before using any other medication, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed in this medication guide.