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Nyquil Side Effects

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Common Nyquil Side Effects


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

Loss Of Consciousness (15)
Dyspnoea (8)
Feeling Abnormal (7)
Fall (6)
Chills (6)
Hypersensitivity (6)
Somnolence (6)
Incorrect Dose Administered (6)
Vomiting (6)
Pain (5)
Hyperhidrosis (5)
Erythema (4)
Dizziness (4)
Confusional State (4)
Fatigue (4)
Head Injury (4)
Pyrexia (4)
Serotonin Syndrome (4)
Tremor (4)
Malaise (4)

➢ 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.

Nyquil Side Effects Reported to FDA



Nyquil Side Effect Report#9924838
Gastric Ulcer Haemorrhage, Platelet Count Decreased
This is a report of a 37-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: cough, who was treated with Nyquil Cold + Flu (dosage: NA, start time: 2012), combined with:
  • Dayquil Cold + Flu
and developed a serious reaction and side effect(s): Gastric Ulcer Haemorrhage, Platelet Count Decreased after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil Cold + Flu treatment in male patients, resulting in Gastric Ulcer Haemorrhage side effect. The patient was hospitalized.
Nyquil Side Effect Report#9870212
Loss Of Consciousness, Off Label Use
This report suggests a potential Nyquil Cold And Flu Loss Of Consciousness side effect(s) that can have serious consequences. A 83-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: nasopharyngitis,oropharyngeal pain and used Nyquil Cold And Flu (dosage: NA) starting NS. After starting Nyquil Cold And Flu the patient began experiencing various side effects, including: Loss Of Consciousness, Off Label UseAdditional drugs used concurrently: NA. Although Nyquil Cold And Flu demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Loss Of Consciousness, may still occur.
Nyquil Side Effect Report#9870192
Blood Pressure Decreased, Psychomotor Hyperactivity
This Blood Pressure Decreased problem was reported by a consumer or non-health professional from US. A 29-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Jan 01, 2011 this consumer started treatment with Nyquil Cold + Flu (dosage: Dosage Per Label Once Only, Oral). The following drugs were being taken at the same time: NA. When using Nyquil Cold + Flu, the patient experienced the following unwanted symptoms/side effects: Blood Pressure Decreased, Psychomotor HyperactivityThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Blood Pressure Decreased, may become evident only after a product is in use by the general population.
Nyquil Side Effect Report#9852361
Insomnia, Headache
This Insomnia side effect was reported by a consumer or non-health professional from US. A 49-year-old male patient (weight:NA) experienced the following symptoms/conditions: nasopharyngitis,cough,pyrexia.The patient was prescribed Nyquil (drug dosage: NA), which was initiated on
Jan 24, 2014. Concurrently used drugs: NA..After starting to take Nyquil the consumer reported adverse symptoms, such as: Insomnia, HeadacheThese side effects may potentially be related to Nyquil.
Nyquil Side Effect Report#9850000
Somnolence, Off Label Use, Incorrect Dose Administered, Intentional Overdose
This is a report of a 54-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: insomnia, who was treated with Nyquil Cold And Flu (dosage: 1 Only, start time:
Jan 10, 2014), combined with:
  • Haldol /00027401/ (haloperidol)
and developed a serious reaction and side effect(s): Somnolence, Off Label Use, Incorrect Dose Administered, Intentional Overdose after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil Cold And Flu treatment in female patients, resulting in Somnolence side effect. The patient was hospitalized.
Nyquil Side Effect Report#9695783
Dyspnoea, Swelling Face, Loss Of Consciousness
This report suggests a potential Nyquil Cough Dyspnoea side effect(s) that can have serious consequences. A 19-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: rhinorrhoea,cough and used Nyquil Cough (dosage: At Bed Time Taking Per Mouth) starting
Nov 13, 2013. After starting Nyquil Cough the patient began experiencing various side effects, including: Dyspnoea, Swelling Face, Loss Of ConsciousnessAdditional drugs used concurrently: NA.The patient was hospitalized. Although Nyquil Cough demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Dyspnoea, may still occur.
Nyquil Side Effect Report#9688724
Mydriasis, Initial Insomnia, Exposure Via Ingestion
This Mydriasis problem was reported by a consumer or non-health professional from US. A 2-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Oct 28, 2013 this consumer started treatment with Nyquil Less Drowsy Cold/flu Relief, Soothing Berry Flavor(dextromethorphan Hydrobromide 30 Mg (dosage: 1/4 Of The Bottle, 1 Only, Oral). The following drugs were being taken at the same time: NA. When using Nyquil Less Drowsy Cold/flu Relief, Soothing Berry Flavor(dextromethorphan Hydrobromide 30 Mg, the patient experienced the following unwanted symptoms/side effects: Mydriasis, Initial Insomnia, Exposure Via IngestionThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Mydriasis, may become evident only after a product is in use by the general population.
Nyquil Side Effect Report#9626150
Chest Pain, Hallucination, Psychotic Disorder
This Chest Pain side effect was reported by a consumer or non-health professional from US. A 34-year-old male patient (weight:NA) experienced the following symptoms/conditions: nasopharyngitis,cough.The patient was prescribed Nyquil (drug dosage: NA), which was initiated on
Feb 01, 2013. Concurrently used drugs: NA..After starting to take Nyquil the consumer reported adverse symptoms, such as: Chest Pain, Hallucination, Psychotic DisorderThese side effects may potentially be related to Nyquil. The patient was hospitalized and became disabled.
Nyquil Side Effect Report#9331836
Loss Of Consciousness, Amnesia
This is a report of a 60-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Nyquil (dosage: NA, start time: 201206), combined with:
  • Copaxone
and developed a serious reaction and side effect(s): Loss Of Consciousness, Amnesia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil treatment in female patients, resulting in Loss Of Consciousness side effect.
Nyquil Side Effect Report#9232229
Serotonin Syndrome
This report suggests a potential Nyquil Serotonin Syndrome side effect(s) that can have serious consequences. A 46-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: nasopharyngitis,depression,diabetes mellitus,hypothyroidism and used Nyquil (dosage: Drank 240ml Of The Liquid In 1 Night) starting NS. After starting Nyquil the patient began experiencing various side effects, including: Serotonin SyndromeAdditional drugs used concurrently:
  • Sertraline (100 Mg/day)
  • Metformin
  • Levothyroxine Sodium (100microg)
The patient was hospitalized. Although Nyquil demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Serotonin Syndrome, may still occur.
Nyquil Side Effect Report#9229909
Serotonin Syndrome, Incorrect Dose Administered, Confusional State, Chills, Agitation, Pyrexia, Hyperhidrosis, Stupor, Diarrhoea
This Serotonin Syndrome problem was reported by a physician from US. A 46-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Nyquil (dosage: In One Night). The following drugs were being taken at the same time: NA. When using Nyquil, the patient experienced the following unwanted symptoms/side effects: Serotonin Syndrome, Incorrect Dose Administered, Confusional State, Chills, Agitation, Pyrexia, Hyperhidrosis, Stupor, DiarrhoeaThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Serotonin Syndrome, may become evident only after a product is in use by the general population.
Nyquil Side Effect Report#9189354
Concussion, Psychotic Disorder, Memory Impairment, Altered Visual Depth Perception, Disturbance In Attention, Headache, Fall, Confusional State, Fatigue
This Concussion side effect was reported by a consumer or non-health professional from US. A 54-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Nyquil Cold And Flu (drug dosage: 2 Liqcap, Evening For 3 Nights, Oral), which was initiated on
Jan 20, 2013. Concurrently used drugs:
  • Tylenol/00020001 (paracetamol)
  • Cymbalta (duloxetine Hydrochloride)
  • Lexapro (escitalopram Oxalate)
  • Xanax (alprazolam)
.After starting to take Nyquil Cold And Flu the consumer reported adverse symptoms, such as: Concussion, Psychotic Disorder, Memory Impairment, Altered Visual Depth Perception, Disturbance In Attention, Headache, Fall, Confusional State, FatigueThese side effects may potentially be related to Nyquil Cold And Flu. The patient was hospitalized.
Nyquil Side Effect Report#9156682
Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover
This is a report of a 39-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: influenza, who was treated with Nyquil Cold And Flu (dosage: NA, start time:
Jan 31, 2013), combined with: NA. and developed a serious reaction and side effect(s): Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil Cold And Flu treatment in female patients, resulting in Loss Of Consciousness side effect.
Nyquil Side Effect Report#9156682
Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover
This report suggests a potential Nyquil Cold And Flu Loss Of Consciousness side effect(s) that can have serious consequences. A 39-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: influenza like illness and used Nyquil Cold And Flu (dosage: NA) starting
Jan 31, 2013. After starting Nyquil Cold And Flu the patient began experiencing various side effects, including: Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, HangoverAdditional drugs used concurrently:
  • Synthroid (levothyroxine Sodium)
Although Nyquil Cold And Flu demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Loss Of Consciousness, may still occur.
Nyquil Side Effect Report#9154694
Fall, Adverse Reaction, Ill-defined Disorder
This Fall problem was reported by a consumer or non-health professional from US. A 75-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: cough. On NS this consumer started treatment with Nyquil (dosage: NA). The following drugs were being taken at the same time:
  • Robitussin
  • Penicillin
  • Nexium
When using Nyquil, the patient experienced the following unwanted symptoms/side effects: Fall, Adverse Reaction, Ill-defined DisorderThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Fall, may become evident only after a product is in use by the general population.
Nyquil Side Effect Report#8839353
Somnambulism
This Somnambulism side effect was reported by a consumer or non-health professional from US. A 6-year-old female patient (weight:NA) experienced the following symptoms/conditions: cough.The patient was prescribed Nyquil (pseudoephedrine) (drug dosage: Single Dose), which was initiated on NS. Concurrently used drugs: NA..After starting to take Nyquil (pseudoephedrine) the consumer reported adverse symptoms, such as: SomnambulismThese side effects may potentially be related to Nyquil (pseudoephedrine).
Nyquil Side Effect Report#8811568
Hypersensitivity, Pharyngeal Oedema, Throat Tightness, Dyspnoea, Malaise
This is a report of a 28-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Nyquil (pseudoephedrine) (dosage: 1 Capful Once Only, Oral, start time:
Sep 05, 2012), combined with: NA. and developed a serious reaction and side effect(s): Hypersensitivity, Pharyngeal Oedema, Throat Tightness, Dyspnoea, Malaise after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil (pseudoephedrine) treatment in male patients, resulting in Hypersensitivity side effect.
Nyquil Side Effect Report#8449340-X
Pregnancy After Post Coital Contraception
This report suggests a potential Nyquil Pregnancy After Post Coital Contraception side effect(s) that can have serious consequences. A female patient (weight: NA) from United States was diagnosed with the following symptoms/conditions: nasopharyngitis,post coital contraception and used Nyquil (dosage: NA) starting
May 31, 2012. After starting Nyquil the patient began experiencing various side effects, including: Pregnancy After Post Coital ContraceptionAdditional drugs used concurrently:
  • Plan B One-step (1.5 Milligram;)
Although Nyquil demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Pregnancy After Post Coital Contraception, may still occur.
Nyquil Side Effect Report#8443474-1
Self Injurious Behaviour, Vomiting, Incorrect Dose Administered
This Self Injurious Behaviour problem was reported by a consumer or non-health professional from United States. A 23-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
May 22, 2012 this consumer started treatment with Nyquil Cough Relief, Cherry Flavor(ethanol 10 %, Dextromethorphan Hydr (dosage: 9 Oz, 1 Only, Oral). The following drugs were being taken at the same time: NA. When using Nyquil Cough Relief, Cherry Flavor(ethanol 10 %, Dextromethorphan Hydr, the patient experienced the following unwanted symptoms/side effects: Self Injurious Behaviour, Vomiting, Incorrect Dose AdministeredThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Self Injurious Behaviour, may become evident only after a product is in use by the general population.
Nyquil Side Effect Report#8390615-0
Deep Vein Thrombosis, Pain
This Deep Vein Thrombosis side effect was reported by a consumer or non-health professional from United States. A 46-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Nyquil (drug dosage: Unk), which was initiated on
Jan 01, 2000. Concurrently used drugs:
  • Yaz (Unk)
  • Singulair
  • Yaz
  • Midrin
  • Flonase (Unk)
  • Tylenol (Unk)
  • Claritin
.After starting to take Nyquil the consumer reported adverse symptoms, such as: Deep Vein Thrombosis, PainThese side effects may potentially be related to Nyquil. The patient was hospitalized.
Nyquil Side Effect Report#8330051-6
Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure
This is a report of a 64-year-old male patient (weight: NA) from Canada, suffering from the following health symptoms/conditions: cough,bronchitis, who was treated with Nyquil (dosage: NA, start time: NS), combined with:
  • Biaxin
  • Benylin Dm
  • Prozac
and developed a serious reaction and side effect(s): Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil treatment in male patients, resulting in Acute Pulmonary Oedema side effect.
Nyquil Side Effect Report#8327084-2
Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure
This report suggests a potential Nyquil Acute Pulmonary Oedema side effect(s) that can have serious consequences. A 64-year-old male patient (weight: NA) from Canada was diagnosed with the following symptoms/conditions: cough and used Nyquil (dosage: NA) starting NS. After starting Nyquil the patient began experiencing various side effects, including: Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac FailureAdditional drugs used concurrently:
  • Benylin Dm
  • Biaxin
  • Prozac
Although Nyquil demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Acute Pulmonary Oedema, may still occur.
Nyquil Side Effect Report#8279809-2
Malaise, Influenza, Somnolence
This Malaise problem was reported by a consumer or non-health professional from United States. A 62-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Nyquil (dosage: NA). The following drugs were being taken at the same time:
  • Nexium
When using Nyquil, the patient experienced the following unwanted symptoms/side effects: Malaise, Influenza, SomnolenceAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Malaise, may become evident only after a product is in use by the general population.
Nyquil Side Effect Report#8254652-9
Pleural Effusion, Pulmonary Infarction, Lobar Pneumonia, Flank Pain, Lung Disorder, Injury, Fear, Circulatory Collapse, Musculoskeletal Pain
This Pleural Effusion side effect was reported by a health professional from United States. A 24-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Nyquil (drug dosage: Unk), which was initiated on
Dec 01, 2006. Concurrently used drugs:
  • Ciprofloxacin Hcl (Unk)
  • Tylenol 1 (2 Capsules, Tid)
  • Iron
  • Mesalamine
  • Yasmin (Unk)
  • Prednisone Tab (15 Mg, Qd)
  • Pentasa (2 Gm, Qd)
.After starting to take Nyquil the consumer reported adverse symptoms, such as: Pleural Effusion, Pulmonary Infarction, Lobar Pneumonia, Flank Pain, Lung Disorder, Injury, Fear, Circulatory Collapse, Musculoskeletal PainThese side effects may potentially be related to Nyquil. The patient was hospitalized.
Nyquil Side Effect Report#8224238-0
Pain, Cholecystitis, Injury, Cholecystitis Acute, Abdominal Pain Upper
This is a report of a 29-year-old female patient (weight: NA) from United States, suffering from the following health symptoms/conditions: nasopharyngitis,menstruation irregular, who was treated with Nyquil (dosage: NA, start time:
Jun 20, 2007), combined with:
  • Yasmin (Unk)
  • Yasmin (Unk)
  • Guaifenesin
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Yaz (Unk)
  • Dayquil
  • Ibuprofen (advil) (200 Mg, Prn)
  • Yasmin (Unk)
and developed a serious reaction and side effect(s): Pain, Cholecystitis, Injury, Cholecystitis Acute, Abdominal Pain Upper after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Nyquil treatment in female patients, resulting in Pain side effect.


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The appearance of Nyquil 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 Nyquil Side Effects for Women?

Women Side EffectsReports
Loss Of Consciousness 10
Fall 5
Feeling Abnormal 5
Hypersensitivity 5
Pain 5
Chills 4
Erythema 4
Head Injury 4
Abdominal Pain Upper 3
Blood Pressure Increased 3

What are common Nyquil Side Effects for Men?

Men Side EffectsReports
Loss Of Consciousness 5
Dyspnoea 4
Serotonin Syndrome 4
Convulsion 3
Hyperhidrosis 3
Incorrect Dose Administered 3
Malaise 3
Pyrexia 3
Somnolence 3
Vomiting 3

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.

    Nyquil 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.

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    Nyquil Safety Alerts, Active Ingredients, Usage Information

    NDC29485-2828
    TypeHUMAN OTC DRUG
    Proprietary NameVicks NyQuil Cold and Flu
    NameAcetaminophen, Dextromethorphan Hydrobromide, and Doxylamine Succinate
    Dosage FormCAPSULE, LIQUID FILLED
    RouteORAL
    On market since20100101
    LabelerMechanical Servants, Inc.
    Active Ingredient(s)ACETAMINOPHEN; DEXTROMETHORPHAN HYDROBROMIDE; DOXYLAMINE SUCCINATE
    Strength(s)325; 15; 6.25
    Unit(s)mg/1; mg/1; mg/1
    Pharma Class

    More About Nyquil

    Side Effects reported to FDA: 75

    Nyquil safety alerts: No

    Reported deaths: 3

    Reported hospitalizations: 16

    Latest Nyquil clinical trials