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

Summary:

Drug interactions are reported among people who take Zanaflex (tizanidine hydrochloride) and Valacyclovir hydrochloride (valacyclovir hydrochloride). Common drug interactions include fall among females and gout among males.

The phase IV clinical study analyzes what interactions people have when they take Zanaflex and Valacyclovir hydrochloride. It is created by eHealthMe based on reports of 18 people who take the same drugs from the FDA, and is updated regularly.

What is Zanaflex?

Zanaflex has active ingredients of tizanidine hydrochloride. It is often used in muscle spasms. eHealthMe is studying from 17,476 Zanaflex users. Check the latest studies of Zanaflex.

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.

On Jul, 06, 2026

18 people who take Zanaflex and Valacyclovir hydrochloride together, and have interactions are studied.

Zanaflex and Valacyclovir hydrochloride drug interactions.

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

female:

Fall
Osteoarthritis (a joint disease caused by cartilage loss in a joint)
Red blood cell count decreased
Restless legs syndrome (a powerful urge to move your legs)
Urinary tract infection
White blood cell count decreased
Abdominal pain upper
Vomiting
Abdominal discomfort
Balance disorder

male:

Gout (uric acid crystals building up in the body)

What are the common drug interactions of Zanaflex and Valacyclovir Hydrochloride, 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:

Dizziness
Hypokinesia (decreased bodily movement)
Muscle spasticity (tight or stiff muscles and an inability to control those muscles)
Swelling face
Tendonitis (a condition that causes pain and swelling of tendons)
Tinnitus (a ringing in the ears)

50-59:

Androgen deficiency
Arthropathy
Blood pressure decreased
Drug ineffective
Drug withdrawal syndrome (interfere with normal social, occupational, or other functioning. are not due to another medical condition, drug use, or discontinuation)
Epstein-barr virus infection
Essential tremor
Fall
Gout (uric acid crystals building up in the body)
Head injury

60+:

Small intestinal obstruction (blockage in small intestine)
Abdominal discomfort
Blood pressure increased
Coeliac disease (simple food intolerance)
Disability
Heart rate decreased
Hospitalisation
Intervertebral disc protrusion (spinal disc protrusion)
Osteoarthritis (a joint disease caused by cartilage loss in a joint)
Sinus disorder (disease of sinus)

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 9 people, 50.00%
Drowsiness: 8 people, 44.44%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 7 people, 38.89%
Nausea (feeling of having an urge to vomit): 7 people, 38.89%
Headache (pain in head): 6 people, 33.33%
Hypothyroidism (abnormally low activity of the thyroid gland, resulting in retardation of growth and mental development): 6 people, 33.33%
Urinary Tract Infection: 6 people, 33.33%
Fibromyalgia (a long-term condition which causes pain all over the body): 6 people, 33.33%
Nervous System Disorder (a general class of medical conditions affecting the nervous system): 5 people, 27.78%
Multiple Myeloma (cancer of the plasma cells): 5 people, 27.78%

* Approximation only. Some reports may have incomplete information.

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