Flomax and Retrograde ejaculation - a phase IV clinical study of FDA data

Summary:

Retrograde ejaculation is reported as a side effect among people who take Flomax (tamsulosin hydrochloride), especially for people who are 60+ old, have been taking the drug for 1 - 6 months also take Aspirin, and have High blood pressure.

The phase IV clinical study analyzes which people have Retrograde ejaculation when taking Flomax. It is created by eHealthMe based on reports of 50,469 people who have side effects when taking Flomax from the FDA, and is updated regularly.

What is Flomax?

Flomax has active ingredients of tamsulosin hydrochloride. It is often used in enlarged prostate. eHealthMe is studying from 52,865 Flomax users. Check the latest studies of Flomax.

What is Retrograde ejaculation?

Retrograde ejaculation (entry of semen into the bladder instead of going out through the urethra during ejaculation) is found to be associated with 42 drugs and 249 conditions by eHealthMe. Check the latest studies of Retrograde ejaculation.

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 Sep, 01, 2026

50,469 people reported to have side effects when taking Flomax.
Among them, 108 people (0.21%) have Retrograde ejaculation.

Could Flomax cause Retrograde ejaculation?

Among these 108 people:

* Approximation only. Some reports may have incomplete information.

Do you take Flomax and have Retrograde ejaculation?

- Check whether Retrograde ejaculation 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 Flomax:

Flomax (52,865 reports)

Retrograde ejaculation treatments and more:

Retrograde ejaculation (928 reports)

How severe was Retrograde ejaculation and when was it recovered:

Retrograde ejaculation in Flomax

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

Retrograde ejaculation and drugs with ingredients of tamsulosin hydrochloride (127 reports)

Sub-studies by age:

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

Browse all side effects of Flomax:

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 Retrograde ejaculation:

Retrograde ejaculation (42 drugs)

Browse all the conditions that are associated with Retrograde ejaculation:

Retrograde ejaculation (249 conditions)

How the study uses the data?

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