Effexor and Flat affect - a phase IV clinical study of FDA data

Summary:

Flat affect 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 Paxil, and have Pain.

The phase IV clinical study analyzes which people have Flat affect 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 Flat affect?

Flat affect (absence of emotional response to a situation) is found to be associated with 295 drugs and 458 conditions by eHealthMe. Check the latest studies of Flat affect.

On Apr, 22, 2026

92,291 people reported to have side effects when taking Effexor.
Among them, 121 people (0.13%) have Flat affect.

Among these 121 people:

* Approximation only. Some reports may have incomplete information.

Do you take Effexor and have Flat affect?

- Check whether Flat affect is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

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

Effexor (99,493 reports)

Flat affect treatments and more:

Flat affect (2,784 reports)

How severe was Flat affect and when was it recovered:

Flat affect in Effexor

Expand to all the drugs that have ingredients of venlafaxine hydrochloride:

Flat affect and drugs with ingredients of venlafaxine hydrochloride (140 reports)

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 Effexor:

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 Flat affect:

Flat affect (295 drugs)

Browse all the conditions that are associated with Flat affect:

Flat affect (458 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.