Fosamax and Retroperitoneal haemorrhage - a phase IV clinical study of FDA data

Summary:

Retroperitoneal haemorrhage is reported as a side effect among people who take Fosamax (alendronate sodium), especially for people who are female, 60+ old, have been taking the drug for 5 - 10 years also take Actonel, and have High blood pressure.

The phase IV clinical study analyzes which people have Retroperitoneal haemorrhage when taking Fosamax. It is created by eHealthMe based on reports of 104,411 people who have side effects when taking Fosamax from the FDA, and is updated regularly.

What is Fosamax?

Fosamax has active ingredients of alendronate sodium. It is often used in osteoporosis. eHealthMe is studying from 105,452 Fosamax users. Check the latest studies of Fosamax.

What is Retroperitoneal haemorrhage?

Retroperitoneal haemorrhage (bleeding between the peritoneum and the posterior abdominal wall) is found to be associated with 365 drugs and 404 conditions by eHealthMe. Check the latest studies of Retroperitoneal haemorrhage.

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

104,411 people reported to have side effects when taking Fosamax.
Among them, 14 people (0.01%) have Retroperitoneal haemorrhage.

Could Fosamax cause Retroperitoneal haemorrhage?

Among these 14 people:

How long have people been on Fosamax when they have Retroperitoneal haemorrhage? *

What is the gender of people who have Retroperitoneal haemorrhage when taking Fosamax? *

female: 100 %
male: 0.0 %

What is the age of people who have Retroperitoneal haemorrhage when taking Fosamax? *

What are other drugs people take besides Fosamax? *

What are other side effects people have besides Retroperitoneal haemorrhage? *

Urinary Tract Infection: 7 people, 50.00%
Depression: 6 people, 42.86%
Hypotension (abnormally low blood pressure): 6 people, 42.86%
Fatigue (feeling of tiredness): 6 people, 42.86%
Temporomandibular Joint Syndrome (pain at the temporomandibular joint due to various causes of increased muscle tension and spasm. it is believed that syndrome is a physical manifestation of psychological stress): 5 people, 35.71%
Acute Kidney Failure: 5 people, 35.71%
Hypothyroidism (abnormally low activity of the thyroid gland, resulting in retardation of growth and mental development): 5 people, 35.71%
Pneumonia: 5 people, 35.71%
Anaemia (lack of blood): 5 people, 35.71%
Fall: 4 people, 28.57%

What are the existing conditions these people have? *

High Blood Pressure: 5 people, 35.71%
Atrial Fibrillation/flutter (atrial fibrillation and flutter are abnormal heart rhythms in which the atria, or upper chambers of the heart, are out of sync with the ventricles): 3 people, 21.43%
Stomach Discomfort (pain in abdomen): 1 person, 7.14%
Insomnia (sleeplessness): 1 person, 7.14%
Indigestion: 1 person, 7.14%
Idiopathic Thrombocytopenic Purpura (bleeding disorder in which the immune system destroys platelets, which are necessary for normal blood clotting): 1 person, 7.14%
Hyperlipidaemia (presence of excess lipids in the blood): 1 person, 7.14%
High Blood Cholesterol: 1 person, 7.14%
Heart Attack: 1 person, 7.14%
Clostridial Infection (infectious conditions by clostridium bacteria): 1 person, 7.14%

* Approximation only. Some reports may have incomplete information.

Do you take Fosamax and have Retroperitoneal haemorrhage?

- Check whether Retroperitoneal haemorrhage 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 Fosamax:

Fosamax (105,452 reports)

Browse all side effects of Fosamax:

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 Retroperitoneal haemorrhage:

Retroperitoneal haemorrhage (365 drugs)

Browse all the conditions that are associated with Retroperitoneal haemorrhage:

Retroperitoneal haemorrhage (404 conditions)

Related publications that referenced our studies

Stuckey BG, Sallie R, "Alendronate-induced unmasking or deterioration of coeliac disease: a case series", Osteoporosis International, 2015 Jan .
Lee WY, Sun LM, Lin MC, Liang JA, Chang SN, Sung FC, Muo CH, Kao CH, "A higher dosage of oral alendronate will increase the subsequent cancer risk of osteoporosis patients in Taiwan: a population-based cohort study", PloS one, 2012 Dec .
Stuckey BG, Sallie R, "Alendronate-induced unmasking or deterioration of coeliac disease: a case series", Osteoporosis International, 2015 Jan .
Lee WY, Sun LM, Lin MC, Liang JA, Chang SN, Sung FC, Muo CH, Kao CH, "A higher dosage of oral alendronate will increase the subsequent cancer risk of osteoporosis patients in Taiwan: a population-based cohort study", PloS one, 2012 Dec .

How the study uses the data?

The study uses data from the FDA. It is based on alendronate sodium (the active ingredients of Fosamax) and Fosamax (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.