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Dextromethorphan Side Effects

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Common Dextromethorphan Side Effects

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The most commonly reported Dextromethorphan side effects (click to view or check a box to report):

Completed Suicide (55)
Cardiac Arrest (34)
Respiratory Arrest (31)
Toxicity To Various Agents (28)
Overdose (28)
Serotonin Syndrome (26)
Cardio-respiratory Arrest (24)
Intentional Overdose (20)
Confusional State (20)
Agitation (17)
Death (16)
Lethargy (11)
Incorrect Dose Administered (10)
Vomiting (10)
Hyperhidrosis (10)
Accidental Overdose (9)
Hallucination (8)
Nausea (8)
Tachycardia (8)
Nystagmus (8)

➢ More

If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Dextromethorphan Side Effects Reported to FDA



Dextromethorphan Side Effect Report#9862960
Completed Suicide
This is a report of a 71-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Dextromethorphan Hydrobromide (dosage: NA, start time: NS), combined with:
  • Paroxetine
  • Nortriptyline
  • Diazepam
and developed a serious reaction and side effect(s): Completed Suicide after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan Hydrobromide treatment in female patients, resulting in Completed Suicide side effect.
Dextromethorphan Side Effect Report#9862885
Completed Suicide, Cardio-respiratory Arrest
This report suggests a potential Dextromethorphan Hydrobromide Completed Suicide side effect(s) that can have serious consequences. A 47-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Dextromethorphan Hydrobromide (dosage: NA) starting NS. After starting Dextromethorphan Hydrobromide the patient began experiencing various side effects, including: Completed Suicide, Cardio-respiratory ArrestAdditional drugs used concurrently:
  • Heroin
  • Alprazolam
  • Cocaine
  • Hydroxyzine
  • Quinine
Although Dextromethorphan Hydrobromide demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Completed Suicide, may still occur.
Dextromethorphan Side Effect Report#9862880
Cardio-respiratory Arrest
This Cardio-respiratory Arrest problem was reported by a health professional from US. A 25-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Dextromethorphan Hydrobromide (dosage: Unk). The following drugs were being taken at the same time: NA. When using Dextromethorphan Hydrobromide, the patient experienced the following unwanted symptoms/side effects: Cardio-respiratory ArrestAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Cardio-respiratory Arrest, may become evident only after a product is in use by the general population.
Dextromethorphan Side Effect Report#9862819
Completed Suicide
This Completed Suicide side effect was reported by a health professional from US. A 24-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Dextromethorphan Hydrobromide (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Ethylene Glycol
  • Salicylates
  • Amphetamine
  • Vitamin B3
.After starting to take Dextromethorphan Hydrobromide the consumer reported adverse symptoms, such as: Completed SuicideThese side effects may potentially be related to Dextromethorphan Hydrobromide.
Dextromethorphan Side Effect Report#9862659
This is a report of a 17-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Dextromethorphan Hydrobromide (dosage: Unk, start time: NS), combined with:
  • Chlorpheniramine (Unk)
  • Alprazolam (Unk)
and developed a serious reaction and side effect(s): after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan Hydrobromide treatment in male patients, resulting in Death side effect.
Dextromethorphan Side Effect Report#9860507
Cardio-respiratory Arrest
This report suggests a potential Dextromethorphan Hydrobromide Death side effect(s) that can have serious consequences. A 57-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Dextromethorphan Hydrobromide (dosage: Unk) starting NS. After starting Dextromethorphan Hydrobromide the patient began experiencing various side effects, including: Cardio-respiratory ArrestAdditional drugs used concurrently:
  • Dextromethorphan W/doxylamine/paracetamol/pse (Unk)
Although Dextromethorphan Hydrobromide demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Death, may still occur.
Dextromethorphan Side Effect Report#9860443
Cardio-respiratory Arrest
This Cardio-respiratory Arrest problem was reported by a health professional from US. A 32-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Dextromethorphan Hydrobromide (dosage: Unk). The following drugs were being taken at the same time:
  • Cocaine (Unk)
  • Heroin (Unk)
  • Levamisole (Unk)
  • Codeine (Unk)
When using Dextromethorphan Hydrobromide, the patient experienced the following unwanted symptoms/side effects: Cardio-respiratory ArrestAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Cardio-respiratory Arrest, may become evident only after a product is in use by the general population.
Dextromethorphan Side Effect Report#9860384
This Death side effect was reported by a health professional from US. A 17-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Dextromethorphan Hydrobromide (drug dosage: Unk), which was initiated on NS. Concurrently used drugs:
  • Chlorpheniramine (Unk)
  • Alprazolam (Unk)
.After starting to take Dextromethorphan Hydrobromide the consumer reported adverse symptoms, such as: These side effects may potentially be related to Dextromethorphan Hydrobromide.
Dextromethorphan Side Effect Report#9848901
Dizziness
This is a report of a 66-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: nasopharyngitis, who was treated with Dextromethorphan Polilstirex (dosage: NA, start time:
Jan 24, 2014), combined with: NA. and developed a serious reaction and side effect(s): Dizziness after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan Polilstirex treatment in female patients, resulting in Dizziness side effect.
Dextromethorphan Side Effect Report#9831426
Toxicity To Various Agents
This report suggests a potential Dextromethorphan Toxicity To Various Agents side effect(s) that can have serious consequences. A 50-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Dextromethorphan (dosage: NA) starting NS. After starting Dextromethorphan the patient began experiencing various side effects, including: Toxicity To Various AgentsAdditional drugs used concurrently:
  • Acetaminophen
  • Acetaminophen
  • Methadone
  • Oxycodone
  • Hydrocodone
Although Dextromethorphan demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Toxicity To Various Agents, may still occur.
Dextromethorphan Side Effect Report#9831425
Toxicity To Various Agents
This Toxicity To Various Agents problem was reported by a pharmacist from US. A 50-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Dextromethorphan (dosage: NA). The following drugs were being taken at the same time:
  • Doxylamine
  • Diphenhydramine
  • Morphine
  • Paroxetine
When using Dextromethorphan, the patient experienced the following unwanted symptoms/side effects: Toxicity To Various AgentsAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Toxicity To Various Agents, may become evident only after a product is in use by the general population.
Dextromethorphan Side Effect Report#9831410
Toxicity To Various Agents
This Toxicity To Various Agents side effect was reported by a pharmacist from US. A 58-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Dextromethorphan (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Acetaminophen
  • Acetaminophen
  • Morphine
  • Amitriptyline
.After starting to take Dextromethorphan the consumer reported adverse symptoms, such as: Toxicity To Various AgentsThese side effects may potentially be related to Dextromethorphan.
Dextromethorphan Side Effect Report#9830503
Completed Suicide, Cardiac Arrest, Respiratory Arrest
This is a report of a 43-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Dextromethorphan Hbr (dosage: NA, start time: NS), combined with:
  • Diphenhydramine
and developed a serious reaction and side effect(s): Completed Suicide, Cardiac Arrest, Respiratory Arrest after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan Hbr treatment in female patients, resulting in Completed Suicide side effect.
Dextromethorphan Side Effect Report#9830500
Completed Suicide
This report suggests a potential Dextromethorphan Hbr Completed Suicide side effect(s) that can have serious consequences. A 32-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Dextromethorphan Hbr (dosage: NA) starting NS. After starting Dextromethorphan Hbr the patient began experiencing various side effects, including: Completed SuicideAdditional drugs used concurrently:
  • Bupropion
  • Diphenhydramine
  • Doxylamine
  • Citalopram
Although Dextromethorphan Hbr demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Completed Suicide, may still occur.
Dextromethorphan Side Effect Report#9830499
Completed Suicide
This Completed Suicide problem was reported by a pharmacist from US. A 71-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Dextromethorphan Hbr (dosage: NA). The following drugs were being taken at the same time:
  • Paroxetine
  • Nortriptyline
  • Diazepam
When using Dextromethorphan Hbr, the patient experienced the following unwanted symptoms/side effects: Completed SuicideAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Completed Suicide, may become evident only after a product is in use by the general population.
Dextromethorphan Side Effect Report#9830497
Completed Suicide
This Completed Suicide side effect was reported by a pharmacist from US. A 20-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Dextromethorphan Hbr (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Diphenhydramine
  • Chlorpheniramine
  • Fluoxetine
.After starting to take Dextromethorphan Hbr the consumer reported adverse symptoms, such as: Completed SuicideThese side effects may potentially be related to Dextromethorphan Hbr.
Dextromethorphan Side Effect Report#9830265
Cardiac Arrest, Respiratory Arrest
This is a report of a 57-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Dextromethorphan Hbr (dosage: NA, start time: NS), combined with:
  • Acetaminophen/dextromethorphan/doxylamine/pseudoephedrine
and developed a serious reaction and side effect(s): Cardiac Arrest, Respiratory Arrest after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan Hbr treatment in female patients, resulting in Death side effect.
Dextromethorphan Side Effect Report#9828947
Toxicity To Various Agents
This report suggests a potential Dextromethorphan Toxicity To Various Agents side effect(s) that can have serious consequences. A 69-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Dextromethorphan (dosage: NA) starting NS. After starting Dextromethorphan the patient began experiencing various side effects, including: Toxicity To Various AgentsAdditional drugs used concurrently:
  • Acetaminophen
  • Acetaminophen
  • Oxycodone
  • Hydrocodone
  • Citalopram
  • Bupropion
  • Metoprolol
Although Dextromethorphan demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Toxicity To Various Agents, may still occur.
Dextromethorphan Side Effect Report#9828505
Cardiac Arrest, Respiratory Arrest
This Cardiac Arrest problem was reported by a pharmacist from US. A 25-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Dextromethorphan Hbr (dosage: Unk). The following drugs were being taken at the same time: NA. When using Dextromethorphan Hbr, the patient experienced the following unwanted symptoms/side effects: Cardiac Arrest, Respiratory ArrestAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Cardiac Arrest, may become evident only after a product is in use by the general population.
Dextromethorphan Side Effect Report#9828406
Completed Suicide
This Completed Suicide side effect was reported by a pharmacist from US. A 24-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Dextromethorphan Hbr (drug dosage: Unk), which was initiated on NS. Concurrently used drugs:
  • Ethylene Glycol (Unk)
  • Acetylsalicylic Acid (Unk)
  • Amphetamine (Unk)
  • Vitamin B3 (Unk)
  • Chlorpheniramine
.After starting to take Dextromethorphan Hbr the consumer reported adverse symptoms, such as: Completed SuicideThese side effects may potentially be related to Dextromethorphan Hbr.
Dextromethorphan Side Effect Report#9828331
This is a report of a 23-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Dextromethorphan Hbr (dosage: Unk, start time: NS), combined with:
  • Heroin (Unk)
and developed a serious reaction and side effect(s): after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan Hbr treatment in male patients, resulting in Death side effect.
Dextromethorphan Side Effect Report#9821924
Cardiac Arrest, Respiratory Arrest
This report suggests a potential Dextromethorphan Hbr Cardiac Arrest side effect(s) that can have serious consequences. A 32-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Dextromethorphan Hbr (dosage: NA) starting NS. After starting Dextromethorphan Hbr the patient began experiencing various side effects, including: Cardiac Arrest, Respiratory ArrestAdditional drugs used concurrently:
  • Codeine
  • Cocaine
  • Heroin
  • Levamisole
Although Dextromethorphan Hbr demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Cardiac Arrest, may still occur.
Dextromethorphan Side Effect Report#9816602
This Death problem was reported by a pharmacist from US. A 17-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Dextromethorphan Hbr (dosage: NA). The following drugs were being taken at the same time:
  • Alprazolam
  • Chlorpheniramine
When using Dextromethorphan Hbr, the patient experienced the following unwanted symptoms/side effects:Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Death, may become evident only after a product is in use by the general population.
Dextromethorphan Side Effect Report#9813356
Toxicity To Various Agents
This Toxicity To Various Agents side effect was reported by a pharmacist from US. A 23-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Dextromethorphan (romilar, Xinli) +/- Guaifenesin (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Heroin
.After starting to take Dextromethorphan (romilar, Xinli) +/- Guaifenesin the consumer reported adverse symptoms, such as: Toxicity To Various AgentsThese side effects may potentially be related to Dextromethorphan (romilar, Xinli) +/- Guaifenesin.
Dextromethorphan Side Effect Report#9813264
Toxicity To Various Agents
This is a report of a 33-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Dextromethorphan (romilar, Xinli) +/- Guaifenesin (dosage: NA, start time: NS), combined with:
  • Heroin
  • Alprazolam
  • Cocaine
  • Quinine
and developed a serious reaction and side effect(s): Toxicity To Various Agents after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Dextromethorphan (romilar, Xinli) +/- Guaifenesin treatment in male patients, resulting in Toxicity To Various Agents side effect.


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The appearance of Dextromethorphan on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

What are common Dextromethorphan Side Effects for Women?

Women Side EffectsReports
Completed Suicide 23
Toxicity To Various Agents 12
Cardiac Arrest 11
Respiratory Arrest 9
Convulsion 7
Overdose 7
Vomiting 7
Confusional State 5
Death 5
Nausea 5

What are common Dextromethorphan Side Effects for Men?

Men Side EffectsReports
Completed Suicide 31
Serotonin Syndrome 25
Cardiac Arrest 23
Respiratory Arrest 22
Cardio-respiratory Arrest 19
Overdose 19
Intentional Overdose 16
Toxicity To Various Agents 16
Confusional State 15
Agitation 12

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

    • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Dextromethorphan reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

    Discuss Dextromethorphan Side Effects

    Did You Have a Dextromethorphan Side Effect?

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    How Effective is Dextromethorphan for You?

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    Dextromethorphan Safety Alerts, Active Ingredients, Usage Information

    NDC0472-1630
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NamePrometh with Dextromethorphan Promethazine Hydrochloride, Dextromethorphan Hydrobromide
    NameSYRUP
    Dosage FormORAL
    Route20070103
    On market sinceActavis Mid Atlantic LLC
    LabelerDEXTROMETHORPHAN HYDROBROMIDE; PROMETHAZINE HYDROCHLORIDE
    Active Ingredient(s)15; 6.25
    Strength(s)mg/5mL; mg/5mL
    Unit(s)Phenothiazine [EPC],Phenothiazines [Chemical/Ingredient],Uncompetitive N-methyl-D-aspartate Receptor
    Pharma Class

    More About Dextromethorphan

    Side Effects reported to FDA: 304

    Dextromethorphan safety alerts: 2005

    Reported deaths: 135

    Reported hospitalizations: 58

    Dextromethorphan

    Audience: Healthcare professionals and consumers

    FDA issued a Talk Paper to notify the public about the abuse of dextromethorphan (DXM), an ingredient found in many over-the-counter (OTC) cough and cold remedies. The agency is working with other health and law enforcement authorities to address this serious issue and warn the public of potential harm, after five recently reported deaths of teenagers that may be associated with the consumption of powdered DXM sold in capsules.

    [May 20, 2005 - Talk Paper - FDA]

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