Valacyclovir hydrochloride and Pathogen resistance - a phase IV clinical study of FDA data

Summary:

Pathogen resistance is reported as a side effect among people who take Valacyclovir hydrochloride (valacyclovir hydrochloride), especially for people who are female, 60+ old, have been taking the drug for < 1 month also take Acyclovir, and have Dyslipidaemia.

The phase IV clinical study analyzes which people have Pathogen resistance when taking Valacyclovir hydrochloride. It is created by eHealthMe based on reports of 12,770 people who have side effects when taking Valacyclovir hydrochloride from the FDA, and is updated regularly.

What is Valacyclovir hydrochloride?

Valacyclovir hydrochloride has active ingredients of valacyclovir hydrochloride. It is often used in herpes zoster. eHealthMe is studying from 12,929 Valacyclovir hydrochloride users. Check the latest studies of Valacyclovir hydrochloride.

What is Pathogen resistance?

Pathogen resistance is found to be associated with 443 drugs and 596 conditions by eHealthMe. Check the latest studies of Pathogen resistance.

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 Aug, 27, 2026

12,770 people reported to have side effects when taking Valacyclovir hydrochloride.
Among them, 34 people (0.27%) have Pathogen resistance.

Could Valacyclovir hydrochloride cause Pathogen resistance?

Among these 34 people:

How long have people been on Valacyclovir hydrochloride when they have Pathogen resistance? *

What is the gender of people who have Pathogen resistance when taking Valacyclovir hydrochloride? *

female: 58.33 %
male: 41.67 %

What is the age of people who have Pathogen resistance when taking Valacyclovir hydrochloride? *

What are other drugs people take besides Valacyclovir hydrochloride? *

What are other side effects people have besides Pathogen resistance? *

Drug Resistance (reduction in effectiveness of a drug): 10 people, 29.41%
Cytomegalovirus Infection: 6 people, 17.65%
Disease Recurrence: 6 people, 17.65%
Drug Ineffective: 6 people, 17.65%
Cytomegalovirus Viraemia (cytomegalo virus in blood stream): 5 people, 14.71%
Encephalitis Cytomegalovirus (inflammation of the brain due to cytomegalovirus): 5 people, 14.71%
Dry Eyes (lack of adequate tears): 3 people, 8.82%
Eyelid Ptosis (falling of the upper or lower eyelid): 3 people, 8.82%
Visual Acuity Reduced (reduced clearness of vision): 2 people, 5.88%
Lagophthalmos (the inability to close the eyelids completely): 2 people, 5.88%

What are the existing conditions these people have? *

Primary Myelofibrosis (primary disorder of the bone marrow): 7 people, 20.59%
Dyslipidaemia (abnormal amount of lipids): 7 people, 20.59%
Type 2 Diabetes: 6 people, 17.65%
Graft Versus Host Disease (the donated bone marrow or stem cells view the recipient's body as foreign, and the donated cells/bone marrow attack the body): 3 people, 8.82%
Uveitis (inflammation of the uvea): 2 people, 5.88%
Immunodeficiency Disorders: 2 people, 5.88%
Psoriatic Arthropathy (inflammation of the skin and joints with kin condition which typically causes patches (plaques) of red, scaly skin to develop): 1 person, 2.94%
Gastroenteritis (inflammation of stomach and intestine): 1 person, 2.94%
Adenoviral Conjunctivitis (viral conjunctivitis): 1 person, 2.94%
Bone Marrow Conditioning Regimen: 1 person, 2.94%

* Approximation only. Some reports may have incomplete information.

Do you take Valacyclovir hydrochloride and have Pathogen resistance?

- Check whether Pathogen resistance is associated with a drug or a condition
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Related studies:

Effectiveness of, long term effects of, and alternative drugs to Valacyclovir hydrochloride:

Valacyclovir hydrochloride (12,929 reports)

Browse all side effects of Valacyclovir hydrochloride:

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 Pathogen resistance:

Pathogen resistance (443 drugs)

Browse all the conditions that are associated with Pathogen resistance:

Pathogen resistance (596 conditions)

How the study uses the data?

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