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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
on Feb 21, 2014 Male from US , 37 years of age, was diagnosed with and was treated with Nyquil Cold + Flu. Directly after, patient experienced the unwanted or unexpected Nyquil side effects: gastric ulcer haemorrhage, platelet count decreased. Nyquil Cold + Flu dosage: N/A.
Associated medications used:
  • Dayquil Cold + Flu
Patient was hospitalized.

Loss Of Consciousness, Off Label Use
Patient was taking Nyquil Cold And Flu. Patient felt the following Nyquil side effects: loss of consciousness, off label use on Jan 31, 2014 from US Additional patient health information: Male , 83 years of age, was diagnosed with and. Nyquil Cold And Flu dosage: N/A.

Blood Pressure Decreased, Psychomotor Hyperactivity
Adverse event was reported on Jan 31, 2014 by a Female taking Nyquil Cold + Flu (Dosage: Dosage Per Label Once Only, Oral) . Location: US , 29 years of age, After Nyquil was administered, patient encountered several Nyquil side effects: blood pressure decreased, psychomotor hyperactivity. Patient was hospitalized.

Insomnia, Headache
on Jan 28, 2014 Male from US , 49 years of age, weighting 164.0 lb, was diagnosed with and was treated with Nyquil. Directly after, patient experienced the unwanted or unexpected Nyquil side effects: insomnia, headache. Nyquil dosage: N/A.


Somnolence, Off Label Use, Incorrect Dose Administered, Intentional Overdose
on Jan 24, 2014 Female from US , 54 years of age, was diagnosed with and was treated with Nyquil Cold And Flu. Patient felt the following Nyquil side effects: somnolence, off label use, incorrect dose administered, intentional overdose. Nyquil Cold And Flu dosage: 1 Only.
Multiple prescriptions taken:
  • Haldol /00027401/ (haloperidol)
Patient was hospitalized.

Dyspnoea, Swelling Face, Loss Of Consciousness
Patient was taking Nyquil Cough. After Nyquil was administered, patient encountered several Nyquil side effects: dyspnoea, swelling face, loss of consciousness on Nov 18, 2013 from US Additional patient health information: Female , 19 years of age, weighting 125.0 lb, was diagnosed with and. Nyquil Cough dosage: At Bed Time Taking Per Mouth. Patient was hospitalized.

Mydriasis, Initial Insomnia, Exposure Via Ingestion
Adverse event was reported on Mar 11, 2014 by a Female taking Nyquil Less Drowsy Cold/flu Relief, Soothing Berry Flavor(dextromethorphan Hydrobromide 30 Mg (Dosage: 1/4 Of The Bottle, 1 Only, Oral) . Location: US , child 2 years of age, weighting 24.91 lb, Directly after, patient experienced the unwanted or unexpected Nyquil side effects: mydriasis, initial insomnia, exposure via ingestion. Patient was hospitalized.

Chest Pain, Hallucination, Psychotic Disorder
on Oct 15, 2013 Male from US , 34 years of age, weighting 182.0 lb, was diagnosed with and was treated with Nyquil. Patient felt the following Nyquil side effects: chest pain, hallucination, psychotic disorder. Nyquil dosage: N/A. Patient was hospitalized and became disabled.

Loss Of Consciousness, Amnesia
on Jun 03, 2013 Female from US , 60 years of age, was treated with Nyquil. After Nyquil was administered, patient encountered several Nyquil side effects: loss of consciousness, amnesia. Nyquil dosage: N/A.
Multiple concurrent drugs taken:
  • Copaxone


Serotonin Syndrome
Patient was taking Nyquil. Directly after, patient experienced the unwanted or unexpected Nyquil side effects: serotonin syndrome on Apr 15, 2013 from US Additional patient health information: Male , 46 years of age, was diagnosed with and. Nyquil dosage: Drank 240ml Of The Liquid In 1 Night.
Associated medications used:
  • Sertraline (100 Mg/day)
  • Metformin
  • Levothyroxine Sodium (100microg)
Patient was hospitalized.

Serotonin Syndrome, Incorrect Dose Administered, Confusional State, Chills, Agitation, Pyrexia, Hyperhidrosis, Stupor, Diarrhoea
Adverse event was reported on Apr 11, 2013 by a Male taking Nyquil (Dosage: In One Night) . Location: US , 46 years of age, Patient felt the following Nyquil side effects: serotonin syndrome, incorrect dose administered, confusional state, chills, agitation, pyrexia, hyperhidrosis, stupor, diarrhoea. Patient was hospitalized.

Concussion, Psychotic Disorder, Memory Impairment, Altered Visual Depth Perception, Disturbance In Attention, Headache, Fall, Confusional State, Fatigue
on Mar 22, 2013 Female from US , 54 years of age, was treated with Nyquil Cold And Flu. After Nyquil was administered, patient encountered several Nyquil side effects: concussion, psychotic disorder, memory impairment, altered visual depth perception, disturbance in attention, headache, fall, confusional state, fatigue. Nyquil Cold And Flu dosage: 2 Liqcap, Evening For 3 Nights, Oral.
Multiple concurrent drugs taken:
  • Tylenol/00020001 (paracetamol)
  • Cymbalta (duloxetine Hydrochloride)
  • Lexapro (escitalopram Oxalate)
  • Xanax (alprazolam)
Patient was hospitalized.

Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover
on Mar 19, 2013 Female from US , 39 years of age, was diagnosed with and was treated with Nyquil Cold And Flu. Directly after, patient experienced the unwanted or unexpected Nyquil side effects: loss of consciousness, feeling abnormal, fatigue, fall, laceration, skin injury, head injury, contusion, hangover. Nyquil Cold And Flu dosage: N/A.

Loss Of Consciousness, Feeling Abnormal, Fatigue, Fall, Laceration, Skin Injury, Head Injury, Contusion, Hangover
Patient was taking Nyquil Cold And Flu. Patient felt the following Nyquil side effects: loss of consciousness, feeling abnormal, fatigue, fall, laceration, skin injury, head injury, contusion, hangover on Feb 26, 2014 from US Additional patient health information: Female , 39 years of age, weighting 132.9 lb, was diagnosed with and. Nyquil Cold And Flu dosage: N/A.
Multiple prescriptions taken:
  • Synthroid (levothyroxine Sodium)


Fall, Adverse Reaction, Ill-defined Disorder
Adverse event was reported on Aug 06, 2013 by a Female taking Nyquil (Dosage: N/A) was diagnosed with and. Location: US , 75 years of age, After Nyquil was administered, patient encountered several Nyquil side effects: fall, adverse reaction, ill-defined disorder.
Multiple concurrent drugs taken:
  • Robitussin
  • Penicillin
  • Nexium
Patient was hospitalized.

Somnambulism
on Oct 11, 2012 Female from US , child 6 years of age, weighting 47.00 lb, was diagnosed with and was treated with Nyquil (pseudoephedrine). Directly after, patient experienced the unwanted or unexpected Nyquil side effects: somnambulism. Nyquil (pseudoephedrine) dosage: Single Dose.

Hypersensitivity, Pharyngeal Oedema, Throat Tightness, Dyspnoea, Malaise
on Sep 27, 2012 Male from US , 28 years of age, weighting 220.0 lb, was treated with Nyquil (pseudoephedrine). Patient felt the following Nyquil side effects: hypersensitivity, pharyngeal oedema, throat tightness, dyspnoea, malaise. Nyquil (pseudoephedrine) dosage: 1 Capful Once Only, Oral.

Pregnancy After Post Coital Contraception
Patient was taking Nyquil. After Nyquil was administered, patient encountered several Nyquil side effects: pregnancy after post coital contraception on Jun 17, 2012 from UNITED STATES Additional patient health information: Female , weighting 115.1 lb, was diagnosed with and. Nyquil dosage: N/A.
Multiple concurrent drugs taken:
  • Plan B One-step (1.5 Milligram;)


Self Injurious Behaviour, Vomiting, Incorrect Dose Administered
Adverse event was reported on May 23, 2012 by a Female taking Nyquil Cough Relief, Cherry Flavor(ethanol 10 %, Dextromethorphan Hydr (Dosage: 9 Oz, 1 Only, Oral) . Location: UNITED STATES , 23 years of age, Directly after, patient experienced the unwanted or unexpected Nyquil side effects: self injurious behaviour, vomiting, incorrect dose administered. Patient was hospitalized.

Deep Vein Thrombosis, Pain
on May 21, 2012 Female from UNITED STATES , 46 years of age, weighting 275.0 lb, was treated with Nyquil. Patient felt the following Nyquil side effects: deep vein thrombosis, pain. Nyquil dosage: Unk.
Multiple prescriptions taken:
  • Yaz (Unk)
  • Singulair
  • Yaz
  • Midrin
  • Flonase (Unk)
  • Tylenol (Unk)
  • Claritin
Patient was hospitalized.

Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure
on May 01, 2012 Male from CANADA , 64 years of age, was diagnosed with and was treated with Nyquil. After Nyquil was administered, patient encountered several Nyquil side effects: acute pulmonary oedema, serotonin syndrome, toxicity to various agents, cardiac failure. Nyquil dosage: N/A.
Multiple concurrent drugs taken:
  • Biaxin
  • Benylin Dm
  • Prozac


Acute Pulmonary Oedema, Serotonin Syndrome, Toxicity To Various Agents, Cardiac Failure
Patient was taking Nyquil. Directly after, patient experienced the unwanted or unexpected Nyquil side effects: acute pulmonary oedema, serotonin syndrome, toxicity to various agents, cardiac failure on May 01, 2012 from CANADA Additional patient health information: Male , 64 years of age, was diagnosed with and. Nyquil dosage: N/A.
Associated medications used:
  • Benylin Dm
  • Biaxin
  • Prozac


Malaise, Influenza, Somnolence
Adverse event was reported on Nov 18, 2011 by a Male taking Nyquil (Dosage: N/A) . Location: UNITED STATES , 62 years of age, Patient felt the following Nyquil side effects: malaise, influenza, somnolence.
Multiple prescriptions taken:
  • Nexium


Pleural Effusion, Pulmonary Infarction, Lobar Pneumonia, Flank Pain, Lung Disorder, Injury, Fear, Circulatory Collapse, Musculoskeletal Pain
on Mar 26, 2012 Female from UNITED STATES , 24 years of age, weighting 150.0 lb, was treated with Nyquil. After Nyquil was administered, patient encountered several Nyquil side effects: pleural effusion, pulmonary infarction, lobar pneumonia, flank pain, lung disorder, injury, fear, circulatory collapse, musculoskeletal pain. Nyquil dosage: Unk.
Multiple concurrent drugs taken:
  • Ciprofloxacin Hcl (Unk)
  • Tylenol 1 (2 Capsules, Tid)
  • Iron
  • Mesalamine
  • Yasmin (Unk)
  • Prednisone Tab (15 Mg, Qd)
  • Pentasa (2 Gm, Qd)
Patient was hospitalized.

Pain, Cholecystitis, Injury, Cholecystitis Acute, Abdominal Pain Upper
on Mar 14, 2012 Female from UNITED STATES , 29 years of age, weighting 210.0 lb, was diagnosed with and was treated with Nyquil. Directly after, patient experienced the unwanted or unexpected Nyquil side effects: pain, cholecystitis, injury, cholecystitis acute, abdominal pain upper. Nyquil dosage: N/A.
Associated medications used:
  • Yasmin (Unk)
  • Yasmin (Unk)
  • Guaifenesin
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Yaz (Unk)
  • Dayquil
  • Ibuprofen (advil) (200 Mg, Prn)
  • Yasmin (Unk)


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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


    Track Online

  • User Sign In
  • Register to track your side effects

  • 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.

    Discuss Nyquil Side Effects

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