Valacyclovir and Famvir drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Valacyclovir (valacyclovir hydrochloride) and Famvir (famciclovir). Common drug interactions include alanine aminotransferase increased among females and diffuse large b-cell lymphoma among males.

The phase IV clinical study analyzes what interactions people have when they take Valacyclovir and Famvir. It is created by eHealthMe based on reports of 25 people who take the same drugs from the FDA, and is updated regularly.

What is Valacyclovir?

Valacyclovir has active ingredients of valacyclovir hydrochloride. It is often used in genital herpes. eHealthMe is studying from 42,107 Valacyclovir users. Check the latest studies of Valacyclovir.

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.

On Aug, 02, 2026

25 people who take Valacyclovir and Famvir together, and have interactions are studied.

Valacyclovir and Famvir drug interactions.

What are the common drug interactions of Valacyclovir and Famvir, by gender? *:

female:

Alanine aminotransferase increased
Ascites (accumulation of fluid in the abdominal cavity)
Bone disorder
Breast cancer metastatic
Chronic obstructive pulmonary disease (a progressive disease that makes it hard to breathe)
Death
Decreased interest
Deep vein thrombosis (blood clot in a major vein that usually develops in the legs and/or pelvis)
Deformity (disfigurement)
Discomfort

male:

Diffuse large b-cell lymphoma (cancer of b cells, a type of white blood cell)
Chronic kidney disease
Renal failure (kidney dysfunction)

What are the common drug interactions of Valacyclovir and Famvir, by age (0-1 to 60+)? *:

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

n/a

30-39:

n/a

40-49:

Pain
Palpitations (feelings or sensations that your heart is pounding or racing)
Pollakiuria (abnormally frequent passage of relatively small quantities or urine)
Pyrexia (fever)
Renal failure (kidney dysfunction)
Rhinorrhoea (watery mucus discharge from the nose)
Sleep disorder due to general medical condition, insomnia type (a conditions that prevent a person from getting restful sleep due to mental condition of not getting sleep)
Snoring
Somnolence (a state of near-sleep, a strong desire for sleep)
Suicidal ideation

50-59:

Flushing (the warm, red condition of human skin)

60+:

Oedema peripheral (superficial swelling)
Pyrexia (fever)
Decreased interest
Deep vein thrombosis (blood clot in a major vein that usually develops in the legs and/or pelvis)
Deformity (disfigurement)
Discomfort
Dizziness
Dysgeusia (disorder of the sense of taste)
Dyspepsia (indigestion)
Emotional distress

What are the existing conditions these people have? *

Pain: 11 people, 44.00%
Stress And Anxiety: 9 people, 36.00%
Breast Cancer: 8 people, 32.00%
Reflux Gastritis (a condition in which the lining of a person's stomach becomes inflamed as a result of exposure to bile): 8 people, 32.00%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 3 people, 12.00%
Insomnia (sleeplessness): 3 people, 12.00%
Neuralgia (pain in one or more nerves): 2 people, 8.00%
Multiple Myeloma (cancer of the plasma cells): 2 people, 8.00%
Polycythaemia Vera (blood disorder in which the bone marrow makes too many red blood cells): 2 people, 8.00%
Idiopathic Thrombocytopenic Purpura (bleeding disorder in which the immune system destroys platelets, which are necessary for normal blood clotting): 2 people, 8.00%

* Approximation only. Some reports may have incomplete information.

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