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Dimetapp Nighttime Cold & Congestion

Generic Name: diphenhydramine and phenylephrine (DYE fen HYE dra meen and FEN il EFF rin)
Brand Name: Children's Triacting Night Time, Delsym Children's Night Time Cough & Cold, Dimetapp Nighttime Cold & Congestion, Dytan-D, PediaCare Children's Allergy & Cold, Robitussin Night Time Cough & Cold, Triaminic Night Time Cold & Cough

Medically reviewed on August 1, 2017

What is Dimetapp Nighttime Cold & Congestion?

Diphenhydramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.

Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).

Dimetapp Nighttime Cold & Congestion is a combination medicine used to treat symptoms of the common cold or seasonal allergies, including sneezing, runny or stuffy nose, and itchy, watery eyes.

Dimetapp Nighttime Cold & Congestion may also be used for purposes not listed in this medication guide.

Important Information

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

You should not use antihistamine medication to make a child sleepy.

Before taking this medicine

You should not use this medicine if you are allergic to diphenhydramine or phenylephrine.

Do not use this medicine 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.

Ask a doctor or pharmacist if it is safe for you to use this medicine if you have other medical conditions, especially:

It is not known whether Dimetapp Nighttime Cold & Congestion will harm an unborn baby. Do not use this medicine without your doctor's advice if you are pregnant.

It is not known whether diphenhydramine and phenylephrine passes into breast milk or if it could affect a nursing baby. Antihistamines and decongestants may also slow breast milk production. Ask a doctor before using this medicine if you are breast-feeding.

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

How should I take Dimetapp Nighttime Cold & Congestion?

Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. Cold or allergy medicine is usually taken only for a short time until your symptoms clear up.

Do not give Dimetapp Nighttime Cold & Congestion to a child younger than 6 years old. Always ask a doctor before giving cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

You should not use antihistamine medication to make a child sleepy.

The chewable tablet must be chewed before swallowing.

Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.

Call your doctor if your symptoms do not improve after 7 days of treatment, or if you have a fever with a headache, cough, or skin rash.

If you need surgery or medical tests, tell the doctor ahead of time if you have taken a cold medicine within the past few days.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Since cold or allergy medicine is used when needed, you may not be on a dosing schedule. If you are on a schedule, use the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not use extra medicine to make up the missed dose.

What happens if I overdose?

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

What should I avoid while taking Dimetapp Nighttime Cold & Congestion?

This medication may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.

Drinking alcohol with Dimetapp Nighttime Cold & Congestion can cause side effects.

Ask a doctor or pharmacist before using any other cold, allergy, or sleep medicine. Many combination medicines contain diphenhydramine (Benadryl) or phenylephrine. Taking certain products together can cause you to get too much of this medicine.

Dimetapp Nighttime Cold & Congestion side effects

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 this medicine and call your doctor at once if you have:

  • severe dizziness or nervousness;

  • severe drowsiness; or

  • little or no urination.

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

Common side effects may include:

  • dizziness, drowsiness;

  • dry mouth, nose, or throat;

  • blurred vision; or

  • feeling restless or excited (especially in children).

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.

See also: Side effects (in more detail)

What other drugs will affect Dimetapp Nighttime Cold & Congestion?

Ask a doctor or pharmacist before using Dimetapp Nighttime Cold & Congestion if you are also using any other drugs, including prescription and over-the-counter medicines, vitamins, and herbal products. Some medicines can cause unwanted or dangerous effects when used together. Not all possible interactions are listed in this medication guide.

Taking this medicine with other drugs that make you sleepy or slow your breathing can worsen these effects. Ask your doctor before taking Dimetapp Nighttime Cold & Congestion with a sleeping pill, opioid pain medicine, muscle relaxer, or medicine for anxiety, depression, or seizures.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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