Theanine and Hydroxyzine drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Theanine (theanine) and Hydroxyzine (hydroxyzine hydrochloride). Common drug interactions include vulvovaginal pruritus among females and cardio-respiratory arrest among males.

The phase IV clinical study analyzes what interactions people have when they take Theanine and Hydroxyzine. It is created by eHealthMe based on reports of 32 people who take the same drugs from the FDA, and is updated regularly.

What is Theanine?

Theanine has active ingredients of theanine. It is often used in insomnia. eHealthMe is studying from 893 Theanine users. Check the latest studies of Theanine.

What is Hydroxyzine?

Hydroxyzine has active ingredients of hydroxyzine hydrochloride. It is often used in stress and anxiety. eHealthMe is studying from 54,069 Hydroxyzine users. Check the latest studies of Hydroxyzine.

On Jul, 20, 2026

32 people who take Theanine and Hydroxyzine together, and have interactions are studied.

Theanine and Hydroxyzine drug interactions.

What are the common drug interactions of Theanine and Hydroxyzine, by gender? *:

female:

Vulvovaginal pruritus (vulvovaginal severe itching)
Weight fluctuation
Wisdom teeth removal
Eosinophilia (eosinophil count in the peripheral blood exceeds)
Nausea (feeling of having an urge to vomit)
Dizziness
Fatigue (feeling of tiredness)
Haematuria (presence of blood in urine)
Pain
Abdominal pain

male:

Cardio-respiratory arrest (sudden dysfunction of heart and lungs)
Death
Foreign body sensation in eyes (feeling of something in eye)
Headache (pain in head)
Hypersensitivity
Incontinence (lack of moderation or self-control)
Infusion related reaction
Injection site pain
Nasopharyngitis (inflammation of the nasopharynx)
Nausea (feeling of having an urge to vomit)

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

0-1:

n/a

2-9:

n/a

10-19:

Eosinophilia (eosinophil count in the peripheral blood exceeds)
Haematuria (presence of blood in urine)
Nausea (feeling of having an urge to vomit)
Blood creatinine increased
Dry skin
Hot flush (sudden feelings of heat)
Hypertension (high blood pressure)
Rash maculo-papular (red area on the skin that is covered with small confluent bumps)
Rash pustular (redness with pustules)
Rhinitis allergic (inflammation of the nasal airways due to allergy)

20-29:

Cardio-respiratory arrest (sudden dysfunction of heart and lungs)
Death
Cardiac arrest
Respiratory arrest (cessation of normal respiration due to failure of the lungs to function effectively)
Blood prolactin increased
Breast discharge
Hypersensitivity
Oropharyngeal pain
Rhinorrhoea (watery mucus discharge from the nose)

30-39:

Chills (felling of cold)
Dizziness
Fatigue (feeling of tiredness)
Headache (pain in head)
Influenza like illness
Lethargy (tiredness)
Optic neuritis (optic nerve inflammation)
Pain
Pyrexia (fever)
Abdominal pain

40-49:

n/a

50-59:

Nausea (feeling of having an urge to vomit)
Psoriasis (immune-mediated disease that affects the skin)
Retching (strong involuntary effort to vomit)
Urine output decreased

60+:

Abdominal pain
Abdominal pain upper
Contusion (a type of hematoma of tissue in which capillaries)
Crying
Death
Diarrhoea
Dizziness
Dyspepsia (indigestion)
Dyspnoea (difficult or laboured respiration)
Dyspnoea exertional (breathlessness or shortness of breath)

What are the existing conditions these people have? *

Multiple Myeloma (cancer of the plasma cells): 5 people, 15.62%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 3 people, 9.38%
Secondary Progressive Multiple Sclerosis (a stage of ms which comes after relapsing remitting ms in many cases): 2 people, 6.25%
Relapsing-Remitting Multiple Sclerosis (reoccurrence of an inflammatory disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged): 2 people, 6.25%
Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 2 people, 6.25%
Clinically Isolated Syndrome (individual's first neurological episode, caused by inflammation or demyelination of nerve tissue): 2 people, 6.25%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 2 people, 6.25%

* Approximation only. Some reports may have incomplete information.

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