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Dimaphen DM

Generic names: brompheniramine, dextromethorphan, and phenylephrine [brome-fen-IR-a-meen, dex-troe-meth-OR-fan, fen-il-EFF-rin].

Brand names: Alahist DM, BP Allergy DM, Bromatan-DM, Children’s Cold & Cough DM, Cold & Cough Childrens,… Show all 12 brands
Classification of drugs: upper respiratory combinations

What is Dimaphen DM?

Brompheniramine is an antihistamine that decreases any effects of chemical histamine within the body. Histamine is a trigger for nasal congestion, itching, eye watering, and a swollen nose. Dextromethorphan is an effective cough suppressant. It interferes with the signals of the brain, which trigger the cough reflex.

Phenylephrine can be described as a decongestant that shrinks blood vessels in nasal passages. The blood vessels that are dilated can cause nose congestion (stuffy nasal congestion). Brompheniramine, dextromethorphan, and phenylephrine are utilized to treat runny or stuffy noses, as well as itching, sneezing, and watery eyes, cough, sinus congestion due to allergies, as well as the typical cold and an illness called influenza. Dimaphen DM is not a treatment for a cough that is the result of cigarettes, asthma, or emphysema. Dimaphen DM could be used for other purposes not mentioned in this medication guide.

Side effects of Dimaphen DM 

See a doctor immediately. If you notice any of the following symptoms that indicate reactions to an allergen, such as hives: difficulty breathing and swelling of your lips, face, and tongue,

Stop taking this medication and contact your doctor anytime if you are experiencing any serious side effects like:

  • Either a slow, fast, or irregular heart rate;
  • Extremely headaches and mood swings; hallucinations; severe headaches;
  • Intense disorientation as well as anxiety and feeling as if you're about to pass out;
  • Tremor, seizure (convulsions);
  • Bleeding or bruising, an uncommon weakness
  • Fever;
  • Urinating less frequently than normal, or even not at all
  • Being breathless, feeling breathless;
  • Extremely hypertension (severe headache, blurred vision, hearing buzzing panic in the chest, confusion, headache, unsteady heartbeats, seizures).

Less severe side effects can be:

  • Mild headaches;
  • Mild dizziness and drowsiness;
  • Dry mouth, the nose, mouth, or throat
  • Nausea, diarrhea, constipation, upset stomach;
  • Being anxious, restless, or anxious;
  • Blurred vision or
  • Sleep problems (insomnia).

This isn't a complete list of possible side effects, and others could happen. Contact your doctor for advice regarding medical adverse effects. You can report any symptoms to the FDA at 1-800-FDA-1088.


Avoid giving this medicine to children younger than 4 years of age. Always consult with a doctor prior to giving a cold or cough medicine to children. Death can occur due to the improper use of cough or cold medications for very young children. This medication is recommended if you suffer from extreme constipation or blockage in your stomach, the intestines, or cannot urinate.

Don't take this medicine when you suffer from non-treated or uncontrolled illnesses like glaucoma, asthma, glaucoma COPD or hypertension, coronary artery conditions, coronary artery disease, or an overactive thyroid.

Do not take this medication in the event that you've previously taken an MAO inhibitor like furazolidone (Furoxone) or isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam, Zelapar), or tranylcypromine (Parnate) within the past 14 days. A potentially dangerous interaction between drugs could result in serious side effects.

Before you take this drug

Avoid using this drug in the event that you've previously taken an MAO inhibitor, such as furazolidone (Furoxone) or isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam, Zelapar), or tranylcypromine (Parnate), within the last 14 days. A drug interaction that is dangerous could result in serious side effects. It is not recommended to take Dimaphen DM in the case of extreme constipation, obstruction in your stomach or your intestines, or the inability to urinate.

Don't take this medicine. If you suffer from non-treated or uncontrolled illnesses like glaucoma, asthma, copd, high blood pressure, coronary artery disease, or an overactive thyroid, speak with a pharmacist or doctor to determine if it is safe for you to be taking this drug if you are suffering from:

  • A colostomy or ileostomy;
  • Diabetes;
  • Kidney or liver disease;
  • Epilepsy or another seizure;
  • Cough that is mucusy or cough that is caused by emphysema, or chronic bronchitis;
  • Prostate enlargement or urinary problems
  • Low blood pressure;
  • Pheochromocytoma (an adrenal gland tumor) or
  • If you take potassium (cytra, epiklor, k-lyte, and k-phos), kaon, klor-con, polycitra, and urocit-k,

FDA pregnancy classification C It is unclear whether this medication can affect a baby who is not yet born. Do not take Dimaphen DM unless you have medical guidance and are pregnant.

This medication could be absorbed in breast milk and cause harm to a baby who is nursing. Antihistamines as well as decongestants can also reduce the production of breast milk. Do not take this medication without medical advice in the case of breastfeeding babies.

How to take Dimaphen DM?

Take exactly as indicated on the label or as directed by your physician. Do not take it in greater quantities, in smaller amounts, or for a longer period than is recommended. The medication is typically taken only for a brief period until symptoms improve. Don't give this medication to children younger than four years old. Always consult with a doctor prior to giving a cold or cough medicine to children. Death can occur due to the improper use of cold and cough medicines by very young children. Do not take more than seven days consecutively. Discuss with your doctor in the event that your symptoms don't improve after seven days of treatment or if you suffer from symptoms of a headache, fever, or a skin eruption.

Measure the liquid medicine using a spoon that is specifically designed for measuring doses or a medicine cup, not an ordinary tablespoon. If you don't have a device for measuring doses, inquire with your pharmacist to get one. If you are in need of surgical intervention or other medical examinations, notify your doctor or surgeon before the appointment time if you have taken this medicine within the last couple of days. Keep it at room temperature, free of heat and moisture. Avoid freezing.

What happens if I miss a dose?

Because this medication is used at times of need, you might not be on a dose schedule. If you're taking the medication frequently, you should take the missed dose whenever you remember. Do not take your missed dosage if it's close to the time of the next dose. Do not take extra medication to make up for the missed dose.

What happens if I overdose?

For medical emergencies, seek emergency medical attention or contact the Poison Help Line toll-free at 1-800-222-1222.

Overdose symptoms can be severe manifestations of certain side effects outlined in this drug guide.

What should be avoided?

Dimaphen DM could cause blurred vision and could affect your thinking or reactions. Be aware if you drive or engage in any activity that requires that you be aware and in a position to clearly see. Drinking alcohol can trigger certain adverse effects associated with this drug.

Talk to your doctor or pharmacist before taking another cold, allergy, cough, or sleep medication. Antihistamines, cough suppressants, and decongestants can be found in a variety of combination medications. Combining certain medications could result in you taking excessive amounts of a specific medication. Look at the label to determine the presence of an antihistamine, cough suppressant, or decongestant.

Beware of taking these medications if you use weight loss pills, caffeine pills, or any different stimulants (such as ADHD medication). Combining a stimulant with decongestants may increase your chances of having undesirable negative side effects. Beware of becoming dehydrated or overheated when exercising and during hot temperatures. This medication can reduce the sweating and make you more susceptible to heat overheating.

Interaction with other drug

Consult a physician or pharmacist prior to using this medication if you frequently utilize other medicines that can make you restless (such as narcotic pain medications, sleep aids, sedatives, sleep aids, muscle relaxers, and medications that treat seizures, depression, or anxiety). These medications can contribute to the sleepiness caused by dextromethorphan or brompheniramine.

Consult a physician or pharmacist about whether it is appropriate for you to take this medication if you are taking any of these 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), as well as venlafaxine (effexor), and many others;
  • Anti-nausea medicines like belladonna (donnatal), dimenhydrinate (dramamine), dropseridol (inapsine), methscopolamine (pamine), and scopolamine (transderm scop);
  • Medications for urinary or bladder problems like darifenacin (enablex) and flavoxate (urispas), oxybutynin (ditropan, oxytrol), solifenacin (vesicare), tolterodine (detrol), or urogesic blue
  • Bronchodilators like the ipratropium (atrovent) and the tiotropium (spiriva);
  • Inflammatory bowel medications like dicyclomine (bentyl), hyoscyamine (hyomax), and propantheline (pro banthine) as well as
  • Medications for ulcers, like glycopyrrolate (robinul) or mepenzolate (cantil).

This list isn't exhaustive, and there are other drugs that can interfere with dm. Discuss with your doctor the medications you are taking. This includes prescription and over-the-counter vitamins as well as herbal remedies. Don't start an entirely new medication without consulting your physician.