Generic name: dexbrompheniramine, dextromethorphan, and phenylephrine [ dex-brom-feh-neer-a-meen, dex-tro-meh-thor-fan, and-feh-nill-eff-rin ]
Drug class: Upper respiratory combinations
Availability: Rx and/or otc
Pregnancy & Lactation: Risk data not available
What is Alahist dm (dexbrompheniramine)?
Dexbrompheniramine 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.
Dextromethorphan is a cough suppressant. It affects the signals in the brain that trigger cough reflex.
Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).
Alahist DM (dexbrompheniramine) is a combination medicine used to treat runny or stuffy nose, sneezing, itching, watery eyes, cough, and sinus congestion caused by allergies, the common cold, or the flu.
Alahist DM (dexbrompheniramine) will not treat a cough that is caused by smoking, asthma, or emphysema.
Alahist DM (dexbrompheniramine) may also be used for purposes not listed in this medication guide.
Do not use Alahist DM (dexbrompheniramine) 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.
How should I use Alahist dm (dexbrompheniramine)
Use exactly as directed on the label, or as prescribed by your doctor. Cold or cough 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).
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 the surgeon or doctor if you have taken a cough or cold medicine within the past few days.
Store at room temperature away from moisture and heat. Do not freeze.Alahist dm (dexbrompheniramine) Dosage information (more detail)
You should not use this medicine if you are allergic to dexbrompheniramine, dextromethorphan, or phenylephrine.
Do not use cough or cold medicine if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include furazolidone, isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.
Ask a doctor or pharmacist if this medicine is safe to use if you have:
asthma or COPD;
a cough with mucus, or cough caused by chronic bronchitis;
a blockage in your stomach or intestines;
liver or kidney disease;
heart disease, high blood pressure;
a thyroid disorder; or
Ask a doctor before using this medicine if you are pregnant or breast-feeding.
Liquid medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).
What happens if I miss a dose?
Since Alahist DM (dexbrompheniramine) 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.
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 using Alahist dm (dexbrompheniramine)?
Drinking alcohol with Alahist DM (dexbrompheniramine) can cause side effects.
Ask a doctor or pharmacist before using other cough or cold medicines that may contain similar ingredients.
Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.
Alahist dm (dexbrompheniramine) 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.
This medicine may cause serious side effects. Stop using this medicine and call your doctor at once if you have:
fast, pounding, or irregular heartbeats;
shortness of breath;
severe dizziness or nervousness;
little or no urination;
trouble sleeping; or
increased blood pressure--severe headache, blurred vision, pounding in your neck or ears, anxiety, nosebleed.
Common side effects of Alahist DM (dexbrompheniramine) may include:
flushing (warmth, redness, or tingly feeling);
dry mouth, nose, or throat;
feeling nervous, restless, or irritable;
feeling restless or excited (especially in children);
loss of appetite;
blurred vision; or
sleep problems (insomnia).
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 more: Alahist dm (dexbrompheniramine) Side Effects
What other drugs will affect Alahist dm (dexbrompheniramine)?
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.