Alahist DM

Name: Alahist DM

What is the most important information I should know about Alahist DM (brompheniramine, dextromethorphan, and phenylephrine)?

Do not give this medication to a child younger than 4 years old. Always ask a doctor before giving a 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 this medication if you have severe constipation, a blockage in your stomach or intestines, or if you are unable to urinate.

Do not use this medication if you have untreated or uncontrolled diseases such as glaucoma, asthma or COPD, high blood pressure, heart disease, coronary artery disease, or overactive thyroid.

Do not use this medication if you have used an MAO inhibitor such as furazolidone (Furoxone), isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam, Zelapar), or tranylcypromine (Parnate) in the last 14 days. A dangerous drug interaction could occur, leading to serious side effects.

How should I take Alahist DM (brompheniramine, dextromethorphan, and phenylephrine)?

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. This medication is usually taken only for a short time until your symptoms clear up.

Do not give this medication to a child younger than 4 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Do not take for longer than 7 days in a row. Talk with your doctor if your symptoms do not improve after 7 days of treatment, or if you have a fever with a headache or skin rash.

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

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

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

Alahist DM (brompheniramine, dextromethorphan, and phenylephrine) side effects

Get emergency medical help if you have any of these 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 a serious side effect such as:

  • fast, slow, or uneven heart rate;

  • severe headache, mood changes, hallucinations;

  • severe dizziness or anxiety, feeling like you might pass out;

  • tremor, seizure (convulsions);

  • easy bruising or bleeding, unusual weakness;

  • fever;

  • urinating less than usual or not at all;

  • feeling short of breath; or

  • dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, uneven heartbeats, seizure).

Less serious side effects may include:

  • mild headache;

  • mild dizziness, drowsiness;

  • dry mouth, nose, or throat;

  • nausea, diarrhea, constipation, upset stomach;

  • feeling nervous, restless, or irritable;

  • 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.

What other drugs will affect Alahist DM (brompheniramine, dextromethorphan, and phenylephrine)?

Ask a doctor or pharmacist before using this medicine if you regularly use other medicines that make you sleepy (such as narcotic pain medication, sedatives, sleeping pills, muscle relaxers, and medicine for seizures, depression or anxiety). They can add to sleepiness caused by brompheniramine or dextromethorphan.

Ask a doctor or pharmacist if it is safe for you to take this medication if you are also using any of the following drugs:

  • atropine (Atreza, Sal-Tropine);

  • benztropine (Cogentin);

  • topiramate (Topamax);

  • zonisamide (Zonegran);

  • an antidepressant such as citalopram (Celexa), duloxetine (Cymbalta), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem, Symbyax), paroxetine (Paxil, Pexeva), sertraline (Zoloft), venlafaxine (Effexor), and others;

  • anti-nausea medications such as belladonna (Donnatal), dimenhydrinate (Dramamine), droperidol (Inapsine), methscopolamine (Pamine), or scopolamine (Transderm Scop);

  • bladder or urinary medications such as darifenacin (Enablex), flavoxate (Urispas), oxybutynin (Ditropan, Oxytrol), solifenacin (Vesicare), tolterodine (Detrol), or Urogesic Blue;

  • bronchodilators such as ipratropium (Atrovent) or tiotropium (Spiriva);

  • irritable bowel medications such as dicyclomine (Bentyl), hyoscyamine (Hyomax), or propantheline (Pro Banthine); or

  • ulcer medicine such as glycopyrrolate (Robinul) or mepenzolate (Cantil).

This list is not complete and other drugs may interact with brompheniramine, dextromethorphan, and phenylephrine. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.

For the Consumer

Applies to brompheniramine / dextromethorphan / phenylephrine: oral elixir, oral liquid, oral syrup

Renal Dose Adjustments

Data not available

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