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Nyquil Side Effects

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.

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.

Nyquil Side Effects Reported to FDA

The following 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.


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.
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 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). The consumer presented with:
  • Gastric Ulcer Haemorrhage
  • Platelet Count Decreased
which developed 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.

Loss Of Consciousness, Off Label Use
This report suggests a potential Nyquil Cold And Flu Loss Of Consciousness, Off Label Use 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. Soon after starting Nyquil Cold And Flu the patient began experiencing various side effects, including:
  • Loss Of Consciousness
  • Off Label Use
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.

Blood Pressure Decreased, Psychomotor Hyperactivity
This Blood Pressure Decreased, Psychomotor Hyperactivity 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 commencing Nyquil Cold + Flu, the patient experienced the following unwanted symptoms/side effects:
  • Blood Pressure Decreased
  • Psychomotor Hyperactivity
The 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.

Insomnia, Headache
This is a report of a 49-year-old male patient (weight: NA) from US. The patient developed the following symptoms/conditions: nasopharyngitis,cough,pyrexia and was treated with Nyquil (dosage: NA) starting Jan 24, 2014. Concurrently used drugs: NA.Soon after that, the consumer experienced the following side effects:
  • Insomnia
  • Headache
This opens a possibility that Nyquil treatment could cause the above reactions, including insomnia, and some male subjects may be more susceptible.


Somnolence, Off Label Use, Incorrect Dose Administered, Intentional Overdose
A 54-year-old female patient (weight: NA) from US with the following symptoms/conditions: insomnia started Nyquil Cold And Flu treatment (dosage: 1 Only) on Jan 10, 2014. Soon after starting Nyquil Cold And Flu treatment, the subject experienced various side effects, including:
  • Somnolence
  • Off Label Use
  • Incorrect Dose Administered
  • Intentional Overdose
Concurrently used drugs:
  • Haldol /00027401/ (haloperidol)
The patient was hospitalized. This finding indicates that some female patients could be more vulnerable to Nyquil Cold And Flu.

Dyspnoea, Swelling Face, Loss Of Consciousness
A 19-year-old female patient from US (weight: NA) experienced symptoms, such as: rhinorrhoea,cough and was treated with Nyquil Cough(dosage: At Bed Time Taking Per Mouth). The treatment was initiated on Nov 13, 2013. After that a consumer reported the following side effect(s):
  • Dyspnoea
  • Swelling Face
  • Loss Of Consciousness
Concurrently used drugs, which potentially could have contributed to side effect(s) or affected Nyquil Cough efficacy: NA.The patient was hospitalized.

Mydriasis, Initial Insomnia, Exposure Via Ingestion
In this report, Nyquil Less Drowsy Cold/flu Relief, Soothing Berry Flavor(dextromethorphan Hydrobromide 30 Mg was administered for the following condition: NA.A 2-year-old female consumer from US (weight: NA) started Nyquil Less Drowsy Cold/flu Relief, Soothing Berry Flavor(dextromethorphan Hydrobromide 30 Mg treatment (dosage: 1/4 Of The Bottle, 1 Only, Oral) on Oct 28, 2013.Sometime after starting the treatment, the patient complained of the following side effect(s):
  • Mydriasis
  • Initial Insomnia
  • Exposure Via Ingestion
A possible interaction with other drugs could have contributed to this reaction: NA.The patient was hospitalized.Establishing a causal relationship between a specific drug and consumer's side effects is complex, but it is possible that in this report Nyquil Less Drowsy Cold/flu Relief, Soothing Berry Flavor(dextromethorphan Hydrobromide 30 Mg treatment could be related to the listed above side effect(s).

Chest Pain, Hallucination, Psychotic Disorder
This is a report of the following Nyquil side effect(s):
  • Chest Pain
  • Hallucination
  • Psychotic Disorder
A 34-year-old male patient from US (weight: NA) presented with the following condition: nasopharyngitis,cough and received a treatment with Nyquil (dosage: NA) starting: Feb 01, 2013.The following concurrently used drugs could have generated interactions: NA.The patient was hospitalized and became disabled.This report suggests that a Nyquil treatment could be associated with the listed above side effect(s).

Loss Of Consciousness, Amnesia
This Nyquil report was submitted by a 60-year-old female consumer from US (weight: NA). The patient was diagnosed with: NA and Nyquil was administered (dosage: NA) starting: 201206. The consumer developed a set of symptoms:
  • Loss Of Consciousness
  • Amnesia
Other drugs used simultaneously:
  • Copaxone
Those unexpected symptoms could be linked to a Nyquil treatment, however establishing a potential drug-safety problem requires a more detailed clinical analysis.

Serotonin Syndrome
This is a report of a possible correlation between Nyquil use and the following symptoms/side effect(s):
  • Serotonin Syndrome
which could contribute to an assessment of Nyquil risk profile.A 46-year-old male consumer from US (weight: NA) was suffering from nasopharyngitis,depression,diabetes mellitus,hypothyroidism and was treated with Nyquil (dosage: Drank 240ml Of The Liquid In 1 Night) starting NS.Other concurrent medications:
  • Sertraline (100 Mg/day)
  • Metformin
  • Levothyroxine Sodium (100microg)
The patient was hospitalized.

Serotonin Syndrome, Incorrect Dose Administered, Confusional State, Chills, Agitation, Pyrexia, Hyperhidrosis, Stupor, Diarrhoea
A 46-year-old male patient from US (weight: NA) presented with the following symptoms: NA and after a treatment with Nyquil (dosage: In One Night) experienced the following side effect(s):
  • Serotonin Syndrome
  • Incorrect Dose Administered
  • Confusional State
  • Chills
  • Agitation
  • Pyrexia
  • Hyperhidrosis
  • Stupor
  • Diarrhoea
The treatment was started on NS. Nyquil was used in combination with the following drugs: NA.The patient was hospitalized.This report could alert potential Nyquil consumers.

Concussion, Psychotic Disorder, Memory Impairment, Altered Visual Depth Perception, Disturbance In Attention, Headache, Fall, Confusional State, Fatigue
In this report, a 54-year-old female patient from US (weight: NA) was affected by a possible Nyquil Cold And Flu side effect.The patient was diagnosed with NA. After a treatment with Nyquil Cold And Flu (dosage: 2 Liqcap, Evening For 3 Nights, Oral, start date: Jan 20, 2013), the patient experienced the following side effect(s):
  • Concussion
  • Psychotic Disorder
  • Memory Impairment
  • Altered Visual Depth Perception
  • Disturbance In Attention
  • Headache
  • Fall
  • Confusional State
  • Fatigue
The following simultaneously used drugs could have led to this reaction:
  • Tylenol/00020001 (paracetamol)
  • Cymbalta (duloxetine Hydrochloride)
  • Lexapro (escitalopram Oxalate)
  • Xanax (alprazolam)
The patient was hospitalized.The findings here stress that side effects should be taken into consideration when evaluating a Nyquil Cold And Flu treatment.

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 from US (weight: NA), who used Nyquil Cold And Flu (dosage: NA) for a treatment of influenza. After starting a treatment on Jan 31, 2013, the patient experienced the following side effect(s):
  • Loss Of Consciousness
  • Feeling Abnormal
  • Fatigue
  • Fall
  • Laceration
  • Skin Injury
  • Head Injury
  • Contusion
  • Hangover
The following drugs could possibly have interacted with the Nyquil Cold And Flu treatment NA.Taken together, these observations suggest that a Nyquil Cold And Flu treatment could be related to side effect(s), such as Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover.

Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover
This loss of consciousness side effect was reported by a consumer or non-health professional from US. A 39-year-old female patient (weight:NA) experienced the following symptoms/conditions: influenza like illness. The patient was prescribed Nyquil Cold And Flu (dosage: NA), which was started on Jan 31, 2013. Concurrently used drugs:
  • Synthroid (levothyroxine Sodium)
When starting to take Nyquil Cold And Flu the consumer reported the following symptoms:
  • Loss Of Consciousness
  • Feeling Abnormal
  • Fatigue
  • Fall
  • Laceration
  • Skin Injury
  • Head Injury
  • Contusion
  • Hangover
These side effects may potentially be related to Nyquil Cold And Flu.

Fall, Adverse Reaction, Ill-defined Disorder
This is a Nyquil side effect report of a 75-year-old female patient (weight:NA) from US, suffering from the following symptoms/conditions: cough, who was treated with Nyquil (dosage:NA, start time: NS), combined with:
  • Robitussin
  • Penicillin
  • Nexium
, and developed a serious reaction and a fall side effect. The patient presented with:
  • Fall
  • Adverse Reaction
  • Ill-defined Disorder
which developed after the beginning of treatment. The patient was hospitalized. This side effect report can indicate a possible existence of increased vulnerability to Nyquil treatment in female patients suffering from cough, resulting in fall.

Somnambulism
This report suggests a potential Nyquil (pseudoephedrine) somnambulism side effect(s) that can have serious consequences. A 6-year-old female patient from US (weight:NA) was diagnosed with the following health condition(s): cough and used Nyquil (pseudoephedrine) (dosage: Single Dose) starting NS. Soon after starting Nyquil (pseudoephedrine) the patient began experiencing various side effects, including:
  • Somnambulism
Drugs used concurrently:NA. Although Nyquil (pseudoephedrine) demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as somnambulism, may still occur.

Hypersensitivity, Pharyngeal Oedema, Throat Tightness, Dyspnoea, Malaise
This hypersensitivity problem was reported by a consumer or non-health professional from US. A 28-year-old male patient (weight: NA) was diagnosed with the following medical condition(s): NA.On Sep 05, 2012 a consumer started treatment with Nyquil (pseudoephedrine) (dosage: 1 Capful Once Only, Oral). The following drugs/medications were being taken at the same time: NA. When commencing Nyquil (pseudoephedrine), the patient experienced the following unwanted symptoms /side effects:
  • Hypersensitivity
  • Pharyngeal Oedema
  • Throat Tightness
  • Dyspnoea
  • Malaise
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as hypersensitivity, may become evident only after a product is in use by the general population.

Pregnancy After Post Coital Contraception
This is a Nyquil side effect report of a female patient (weight: NA) from UNITED STATES. The patient developed the following symptoms/conditions: nasopharyngitis,post coital contraception and was treated with Nyquil (dosage: NA) starting May 31, 2012. Concurrently used drugs:
  • Plan B One-step (1.5 Milligram;)
Soon after that, the consumer experienced the following of symptoms:
  • Pregnancy After Post Coital Contraception
This opens a possibility that Nyquil could cause pregnancy after post coital contraception and that some female patients may be more susceptible.

Self Injurious Behaviour, Vomiting, Incorrect Dose Administered
A 23-year-old female patient (weight: NA) from UNITED STATES with the following symptoms: NA started Nyquil Cough Relief, Cherry Flavor(ethanol 10 %, Dextromethorphan Hydr treatment (dosage: 9 Oz, 1 Only, Oral) on May 22, 2012. Soon after starting Nyquil Cough Relief, Cherry Flavor(ethanol 10 %, Dextromethorphan Hydr treatment, the consumer experienced several side effects, including:
  • Self Injurious Behaviour
  • Vomiting
  • Incorrect Dose Administered
. Concurrently used drugs: NA.The patient was hospitalized. This finding indicates that some patients can be more vulnerable to developing Nyquil Cough Relief, Cherry Flavor(ethanol 10 %, Dextromethorphan Hydr side effects, such as self injurious behaviour.

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 (dosage: Unk), which was started on Jan 01, 2000. Concurrently used drugs:
  • Yaz (Unk)
  • Singulair
  • Yaz
  • Midrin
  • Flonase (Unk)
  • Tylenol (Unk)
  • Claritin
.When starting to take Nyquil the consumer reported symptoms, such as:
  • Deep Vein Thrombosis
  • Pain
These side effects may potentially be related to Nyquil. The patient was hospitalized.

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 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). The consumer presented with:
  • Acute Pulmonary Oedema
  • Serotonin Syndrome
  • Toxicity To Various Agents
  • Cardiac Failure
which developed 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.

Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure
This report suggests a potential Nyquil Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure 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. Soon after starting Nyquil the patient began experiencing various side effects, including:
  • Acute Pulmonary Oedema
  • Serotonin Syndrome
  • Toxicity To Various Agents
  • Cardiac Failure
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.

Malaise, Influenza, Somnolence
This Malaise, Influenza, Somnolence 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 commencing Nyquil, the patient experienced the following unwanted symptoms/side effects:
  • Malaise
  • Influenza
  • Somnolence
Although 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.

Pleural Effusion, Pulmonary Infarction, Lobar Pneumonia, Flank Pain, Lung Disorder, Injury, Fear, Circulatory Collapse, Musculoskeletal Pain
This is a report of a 24-year-old female patient (weight: NA) from UNITED STATES. The patient developed the following symptoms/conditions: NA and was treated with Nyquil (dosage: Unk) starting 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)
Soon after that, the consumer experienced the following side effects:
  • Pleural Effusion
  • Pulmonary Infarction
  • Lobar Pneumonia
  • Flank Pain
  • Lung Disorder
  • Injury
  • Fear
  • Circulatory Collapse
  • Musculoskeletal Pain
The patient was hospitalized. This opens a possibility that Nyquil treatment could cause the above reactions, including pleural effusion, and some female subjects may be more susceptible.

Pain, Cholecystitis, Injury, Cholecystitis Acute, Abdominal Pain Upper
A 29-year-old female patient (weight: NA) from UNITED STATES with the following symptoms/conditions: nasopharyngitis,menstruation irregular started Nyquil treatment (dosage: NA) on Jun 20, 2007. Soon after starting Nyquil treatment, the subject experienced various side effects, including:
  • Pain
  • Cholecystitis
  • Injury
  • Cholecystitis Acute
  • Abdominal Pain Upper
Concurrently used drugs:
  • Yasmin (Unk)
  • Yasmin (Unk)
  • Guaifenesin
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Yaz (Unk)
  • Dayquil
  • Ibuprofen (advil) (200 Mg, Prn)
  • Yasmin (Unk)
This finding indicates that some female patients could be more vulnerable to Nyquil.

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Keep Track of Side Effects

Note Your Observations

It is really important to keep of your 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

    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.


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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