Fentanyl and Haemoglobin increased - a phase IV clinical study of FDA data

Summary:

Haemoglobin increased is reported as a side effect among people who take Fentanyl (fentanyl citrate), especially for people who are female, 60+ old, have been taking the drug for < 1 month also take Heparin, and have Nausea.

The phase IV clinical study analyzes which people have Haemoglobin increased when taking Fentanyl. It is created by eHealthMe based on reports of 72,646 people who have side effects when taking Fentanyl from the FDA, and is updated regularly.

What is Fentanyl?

Fentanyl has active ingredients of fentanyl citrate. It is often used in pain. eHealthMe is studying from 73,301 Fentanyl users. Check the latest studies of Fentanyl.

What is Haemoglobin increased?

Haemoglobin increased is found to be associated with 477 drugs and 539 conditions by eHealthMe. Check the latest studies of Haemoglobin increased.

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, 27, 2026

72,646 people reported to have side effects when taking Fentanyl.
Among them, 11 people (0.02%) have Haemoglobin increased.

Could Fentanyl cause Haemoglobin increased?

Among these 11 people:

How long have people been on Fentanyl when they have Haemoglobin increased? *

What is the gender of people who have Haemoglobin increased when taking Fentanyl? *

female: 54.55 %
male: 45.45 %

What is the age of people who have Haemoglobin increased when taking Fentanyl? *

What are other drugs people take besides Fentanyl? *

Heparin: 3 people, 27.27%
Gentamicin: 2 people, 18.18%
Midazolam: 2 people, 18.18%
Pantoprazole: 2 people, 18.18%
Gabapentin: 1 person, 9.09%
Duragesic: 1 person, 9.09%
Enbrel: 1 person, 9.09%
Endep: 1 person, 9.09%
Enoxaparin Sodium: 1 person, 9.09%
Erlotinib Hydrochloride: 1 person, 9.09%

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

Haematocrit Increased: 2 people, 18.18%
Red Blood Cell Count Decreased: 2 people, 18.18%
Fatigue (feeling of tiredness): 2 people, 18.18%
Haematocrit Decreased: 2 people, 18.18%
White Blood Cell Count Increased: 2 people, 18.18%
Dyspnea (difficult or laboured breathing): 2 people, 18.18%
Constipation: 2 people, 18.18%
Hyperhidrosis (abnormally increased sweating): 2 people, 18.18%
Hyperkalemia (damage to or disease of the kidney): 2 people, 18.18%
Injection Site Pain: 2 people, 18.18%

What are the existing conditions these people have? *

High Blood Cholesterol: 2 people, 18.18%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 2 people, 18.18%
Anaemia (lack of blood): 2 people, 18.18%
Nausea (feeling of having an urge to vomit): 2 people, 18.18%
Discomfort: 1 person, 9.09%
Adenocarcinoma Pancreas (cancer of pancreas): 1 person, 9.09%
Allergic Rhinitis: 1 person, 9.09%
Anaesthesia: 1 person, 9.09%
Angiodysplasia (small vascular malformation of the gut): 1 person, 9.09%
Anorexia Nervosa (psychological disorder-eating disorder characterized by immoderate food restriction and irrational fear of gaining weight): 1 person, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Fentanyl and have Haemoglobin increased?

- Check whether Haemoglobin increased is associated with a drug or a condition
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Related studies:

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

Fentanyl (73,301 reports)

Browse all side effects of Fentanyl:

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 increased:

Haemoglobin increased (477 drugs)

Browse all the conditions that are associated with Haemoglobin increased:

Haemoglobin increased (539 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on fentanyl citrate (the active ingredients of Fentanyl) and Fentanyl (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.