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Nyquil and Hallucinations aggravated - a phase IV clinical study of FDA data

Summary:

Hallucinations aggravated is reported as a side effect among people who take Nyquil (acetaminophen / dextromethorphan / doxylamine / pseudoephedrine), especially for people who are female, 60+ old, have been taking the drug for < 1 month also take Tylenol, and have Nasopharyngitis.

The phase IV clinical study analyzes which people have Hallucinations aggravated when taking Nyquil. It is created by eHealthMe based on reports of 2,013 people who have side effects when taking Nyquil from the FDA, and is updated regularly.

What is Nyquil?

Nyquil has active ingredients of acetaminophen / dextromethorphan / doxylamine / pseudoephedrine. It is often used in cold symptoms. eHealthMe is studying from 2,240 Nyquil users. Check the latest studies of Nyquil.

What is Hallucinations aggravated?

Hallucinations aggravated (sensations that appear real but are created by your mind) is found to be associated with 1,649 drugs and 557 conditions by eHealthMe. Check the latest studies of Hallucinations aggravated.

On Jul, 14, 2026

2,013 people reported to have side effects when taking Nyquil.
Among them, 24 people (1.19%) have Hallucinations aggravated.

Could Nyquil cause Hallucinations aggravated?

Among these 24 people:

How long have people been on Nyquil when they have Hallucinations aggravated? *

  • < 1 month: 66.67 %
  • 1 - 6 months: 0.0 %
  • 6 - 12 months: 33.33 %
  • 1 - 2 years: 0.0 %
  • 2 - 5 years: 0.0 %
  • 5 - 10 years: 0.0 %
  • 10+ years: 0.0 %

What is the gender of people who have Hallucinations aggravated when taking Nyquil? *

  • female: 57.14 %
  • male: 42.86 %

What is the age of people who have Hallucinations aggravated when taking Nyquil? *

  • 0-1: 0.0 %
  • 2-9: 0.0 %
  • 10-19: 0.0 %
  • 20-29: 10 %
  • 30-39: 30 %
  • 40-49: 20 %
  • 50-59: 10 %
  • 60+: 30 %

What are other drugs people take besides Nyquil? *

  1. Tylenol: 5 people, 20.83%
  2. Vitamin D3: 4 people, 16.67%
  3. Revlimid: 3 people, 12.50%
  4. Prochlorperazine: 3 people, 12.50%
  5. Vitamin D: 3 people, 12.50%
  6. Aspirin: 3 people, 12.50%
  7. Valacyclovir: 3 people, 12.50%
  8. Dexamethasone: 3 people, 12.50%
  9. Juluca: 3 people, 12.50%
  10. Descovy: 3 people, 12.50%

What are other side effects people have besides Hallucinations aggravated? *

  1. Feeling Abnormal: 6 people, 25.00%
  2. Diarrhea: 5 people, 20.83%
  3. Overdose: 5 people, 20.83%
  4. Cholecystitis (infection of gallbladder): 4 people, 16.67%
  5. Posterior Reversible Encephalopathy Syndrome (posterior reversible encephalopathy syndrome (pres), also known as reversible posterior leukoencephalopathy syndrome (rpls), is a syndrome characterized by headache, confusion, seizures and visual loss): 4 people, 16.67%
  6. Acute Hepatic Failure: 4 people, 16.67%
  7. Bleeding Disorders: 4 people, 16.67%
  8. Visual Acuity Reduced (reduced clearness of vision): 4 people, 16.67%
  9. Paraesthesia (sensation of tingling, tickling, prickling, pricking, or burning of a person's skin with no apparent long-term physical effect): 4 people, 16.67%
  10. Nasopharyngitis (inflammation of the nasopharynx): 3 people, 12.50%

What are the existing conditions these people have? *

  1. Upper Respiratory Tract Infection: 4 people, 16.67%
  2. Nasopharyngitis (inflammation of the nasopharynx): 4 people, 16.67%
  3. Multiple Myeloma (cancer of the plasma cells): 3 people, 12.50%
  4. Relapsing-Remitting Multiple Sclerosis (reoccurrence of an inflammatory disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged): 2 people, 8.33%
  5. The Flu (the flu is caused by an influenza virus): 1 person, 4.17%
  6. Polycythaemia Vera (blood disorder in which the bone marrow makes too many red blood cells): 1 person, 4.17%
  7. Pneumonia: 1 person, 4.17%
  8. Parkinson's Disease: 1 person, 4.17%
  9. Influenza Like Illness: 1 person, 4.17%
  10. Hypersensitivity: 1 person, 4.17%

* Approximation only. Some reports may have incomplete information.

Do you take Nyquil and have Hallucinations aggravated?

- Check whether Hallucinations aggravated is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
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Related studies:

Effectiveness of, long term effects of, and alternative drugs to Nyquil:

Hallucinations aggravated treatments and more:

How severe was Hallucinations aggravated and when was it recovered:

Expand to all the drugs that have ingredients of acetaminophen / dextromethorphan / doxylamine / pseudoephedrine:

Sub-studies by gender and age:

Female: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Male: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Browse all side effects of Nyquil:

a b c d e f g h i j k l m n o p q r s t u v w x y z

Browse all the drugs that are associated with Hallucinations aggravated:

Browse all the conditions that are associated with Hallucinations aggravated:

How the study uses the data?

The study uses data from the FDA. It is based on acetaminophen / dextromethorphan / doxylamine / pseudoephedrine (the active ingredients of Nyquil) and Nyquil (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

How to use the study?

DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.

Who is eHealthMe?

With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).

WARNING, DISCLAIMER, USE FOR PUBLICATION

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.

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