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Alahist DM (Brompheniramine, Dextromethorphan, and Phenylephrine)

Generic name: Brompheniramine, Dextromethorphan, and Phenylephrine [ brome-fen-IR-a-meen-dex-troe-meth-OR-fan-& fen-il-EF-rin ]
Brand names: Alahist DM, AP-Hist DM, BroveX PEB DM, Dimaphen DM Cold/Cough, Dimetapp Cold Relief Childrens, ... show all 15 brands
Drug class: Upper respiratory combinations

Medically reviewed by Last updated on Dec 20, 2023.

Uses of Alahist DM:

What do I need to tell my doctor BEFORE I take Alahist DM?

This is not a list of all drugs or health problems that interact with Alahist DM (brompheniramine, dextromethorphan, and phenylephrine).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Alahist DM (brompheniramine, dextromethorphan, and phenylephrine) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Alahist DM?

How is this medicine (Alahist DM) best taken?

Use Alahist DM (brompheniramine, dextromethorphan, and phenylephrine) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

What do I do if I miss a dose?

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

What are some other side effects of Alahist DM?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Alahist DM?

Consumer Information Use and Disclaimer

Further information

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