Famvir and Hypomagnesaemia - a phase IV clinical study of FDA data

Summary:

Hypomagnesaemia is reported as a side effect among people who take Famvir (famciclovir), especially for people who are male, 60+ old, also take Cozaar, and have Breast cancer.

The phase IV clinical study analyzes which people have Hypomagnesaemia when taking Famvir. It is created by eHealthMe based on reports of 2,955 people who have side effects when taking Famvir from the FDA, and is updated regularly.

What is Famvir?

Famvir has active ingredients of famciclovir. It is often used in herpes labialis (oral herpes simplex). eHealthMe is studying from 3,061 Famvir users. Check the latest studies of Famvir.

What is Hypomagnesaemia?

Hypomagnesaemia (electrolyte disturbance in which there is an abnormally low level of magnesium in the blood) is found to be associated with 1,027 drugs and 1,056 conditions by eHealthMe. Check the latest studies of Hypomagnesaemia.

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, 02, 2026

2,955 people reported to have side effects when taking Famvir.
Among them, 11 people (0.37%) have Hypomagnesaemia.

Among these 11 people:

What is the gender of people who have Hypomagnesaemia when taking Famvir? *

female: 50 %
male: 50 %

What is the age of people who have Hypomagnesaemia when taking Famvir? *

What are other drugs people take besides Famvir? *

What are other side effects people have besides Hypomagnesaemia? *

Hypokalemia (low potassium): 11 people, 100.00%
Pain: 10 people, 90.91%
Anaemia (lack of blood): 10 people, 90.91%
Stress And Anxiety: 10 people, 90.91%
Sinusitis (inflammation of sinus): 9 people, 81.82%
Gastrointestinal Haemorrhage (bleeding gastrointestinal tract): 9 people, 81.82%
Musculoskeletal Pain (pain affects the bones, muscles, ligaments, tendons, and nerves): 6 people, 54.55%
Bone Disorder: 6 people, 54.55%
Localised Infection (infection at the single location): 6 people, 54.55%
Pancytopenia (medical condition in which there is a reduction in the number of red and white blood cells, as well as platelets): 6 people, 54.55%

What are the existing conditions these people have? *

Hyperlipidaemia (presence of excess lipids in the blood): 1 person, 9.09%
Breast Cancer: 1 person, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Famvir and have Hypomagnesaemia?

- Check whether Hypomagnesaemia 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 Famvir:

Famvir (3,061 reports)

Hypomagnesaemia treatments and more:

Hypomagnesaemia (18,707 reports)

Browse all side effects of Famvir:

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 Hypomagnesaemia:

Hypomagnesaemia (1,027 drugs)

Browse all the conditions that are associated with Hypomagnesaemia:

Hypomagnesaemia (1,056 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on famciclovir (the active ingredients of Famvir) and Famvir (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.