Effexor and Red blood cell count increased - a phase IV clinical study of FDA data

Summary:

Red blood cell count increased is reported as a side effect among people who take Effexor (venlafaxine hydrochloride), especially for people who are female, 50-59 old, have been taking the drug for < 1 month also take Jakafi, and have Primary myelofibrosis.

The phase IV clinical study analyzes which people have Red blood cell count increased when taking Effexor. It is created by eHealthMe based on reports of 92,291 people who have side effects when taking Effexor from the FDA, and is updated regularly.

What is Effexor?

Effexor has active ingredients of venlafaxine hydrochloride. It is often used in depression. eHealthMe is studying from 99,493 Effexor users. Check the latest studies of Effexor.

What is Red blood cell count increased?

Red blood cell count increased is found to be associated with 429 drugs and 584 conditions by eHealthMe. Check the latest studies of Red blood cell count increased.

On Jul, 14, 2026

92,291 people reported to have side effects when taking Effexor.
Among them, 22 people (0.02%) have Red blood cell count increased.

Could Effexor cause Red blood cell count increased?

Among these 22 people:

How long have people been on Effexor when they have Red blood cell count increased? *

What is the gender of people who have Red blood cell count increased when taking Effexor? *

female: 64.71 %
male: 35.29 %

What is the age of people who have Red blood cell count increased when taking Effexor? *

What are other drugs people take besides Effexor? *

What are other side effects people have besides Red blood cell count increased? *

Fatigue (feeling of tiredness): 11 people, 50.00%
Weight Decreased: 9 people, 40.91%
Weakness: 9 people, 40.91%
Nausea (feeling of having an urge to vomit): 7 people, 31.82%
Malaise (a feeling of general discomfort or uneasiness): 7 people, 31.82%
Upper Respiratory Tract Infection: 7 people, 31.82%
Rashes (redness): 7 people, 31.82%
Weight Increased: 6 people, 27.27%
Haematocrit Increased: 6 people, 27.27%
Immune System Disorder: 6 people, 27.27%

What are the existing conditions these people have? *

Primary Myelofibrosis (primary disorder of the bone marrow): 5 people, 22.73%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 3 people, 13.64%
Post-Traumatic Stress Disorder: 2 people, 9.09%
Major Depression (a mood state that goes well beyond temporarily feeling sad or blue. it is a serious medical illness that affects one's thoughts, feelings): 2 people, 9.09%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 1 person, 4.55%
Hypothyroidism (abnormally low activity of the thyroid gland, resulting in retardation of growth and mental development): 1 person, 4.55%
Attention Deficit Hyperactivity Disorder (a chronic condition including attention difficulty, hyperactivity, and impulsiveness): 1 person, 4.55%
Bipolar Disorder (mood disorder): 1 person, 4.55%
Constipation: 1 person, 4.55%
Diarrhea: 1 person, 4.55%

* Approximation only. Some reports may have incomplete information.

Do you take Effexor and have Red blood cell count increased?

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Related studies:

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

Effexor (99,493 reports)

Browse all side effects of Effexor:

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Browse all the drugs that are associated with Red blood cell count increased:

Red blood cell count increased (429 drugs)

Browse all the conditions that are associated with Red blood cell count increased:

Red blood cell count increased (584 conditions)

How the study uses the data?

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