Narcan and Haemoglobin decreased - a phase IV clinical study of FDA data

Summary:

Haemoglobin decreased is reported as a side effect among people who take Narcan (naloxone hydrochloride), especially for people who are male, 60+ old, have been taking the drug for < 1 month also take Zofran, and have Primary pulmonary hypertension.

The phase IV clinical study analyzes which people have Haemoglobin decreased when taking Narcan. It is created by eHealthMe based on reports of 3,672 people who have side effects when taking Narcan from the FDA, and is updated regularly.

What is Narcan?

Narcan has active ingredients of naloxone hydrochloride. eHealthMe is studying from 3,687 Narcan users. Check the latest studies of Narcan.

What is Haemoglobin decreased?

Haemoglobin decreased is found to be associated with 2,394 drugs and 3,137 conditions by eHealthMe. Check the latest studies of Haemoglobin decreased.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Aug, 28, 2026

3,672 people reported to have side effects when taking Narcan.
Among them, 42 people (1.14%) have Haemoglobin decreased.

Could Narcan cause Haemoglobin decreased?

Among these 42 people:

How long have people been on Narcan when they have Haemoglobin decreased? *

What is the gender of people who have Haemoglobin decreased when taking Narcan? *

female: 45.95 %
male: 54.05 %

What is the age of people who have Haemoglobin decreased when taking Narcan? *

What are other drugs people take besides Narcan? *

What are other side effects people have besides Haemoglobin decreased? *

Dyspnea (difficult or laboured breathing): 21 people, 50.00%
Chest Pain: 18 people, 42.86%
Pain: 18 people, 42.86%
Weakness: 15 people, 35.71%
Abdominal Pain: 14 people, 33.33%
Dizziness: 13 people, 30.95%
Drowsiness: 13 people, 30.95%
Fatigue (feeling of tiredness): 13 people, 30.95%
Fever: 13 people, 30.95%
Nausea (feeling of having an urge to vomit): 13 people, 30.95%

What are the existing conditions these people have? *

Primary Pulmonary Hypertension (primary high blood pressure that affects the arteries in the lungs and the right side of your heart): 8 people, 19.05%
Osteoporosis (bones weak and more likely to break): 7 people, 16.67%
Pain: 7 people, 16.67%
Primary Myelofibrosis (primary disorder of the bone marrow): 5 people, 11.90%
Nausea (feeling of having an urge to vomit): 4 people, 9.52%
Diabetes: 4 people, 9.52%
Skin Ulcer: 3 people, 7.14%
Itching: 2 people, 4.76%
Haemochromatosis (body to absorb more iron than usual from food): 2 people, 4.76%
Gastrointestinal Stromal Tumor: 2 people, 4.76%

* Approximation only. Some reports may have incomplete information.

Do you take Narcan and have Haemoglobin decreased?

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- 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 Narcan:

Narcan (3,687 reports)

Browse all side effects of Narcan:

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 Haemoglobin decreased:

Haemoglobin decreased (2,395 drugs)

Browse all the conditions that are associated with Haemoglobin decreased:

Haemoglobin decreased (3,137 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on naloxone hydrochloride (the active ingredients of Narcan) and Narcan (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.