Valtrex and Cayston drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Valtrex (valacyclovir hydrochloride) and Cayston (aztreonam). Common drug interactions include chronic obstructive pulmonary disease among females.

The phase IV clinical study analyzes what interactions people have when they take Valtrex and Cayston. It is created by eHealthMe based on reports of 15 people who take the same drugs from the FDA, and is updated regularly.

What is Valtrex?

Valtrex has active ingredients of valacyclovir hydrochloride. It is often used in genital herpes. eHealthMe is studying from 39,999 Valtrex users. Check the latest studies of Valtrex.

What is Cayston?

Cayston has active ingredients of aztreonam. It is often used in cystic fibrosis. eHealthMe is studying from 5,310 Cayston users. Check the latest studies of Cayston.

On Aug, 12, 2026

15 people who take Valtrex and Cayston together, and have interactions are studied.

What are the common drug interactions of Valtrex and Cayston, by gender? *:

female:

Chronic obstructive pulmonary disease (a progressive disease that makes it hard to breathe)
Dyspnoea (difficult or laboured respiration)
Scar
Blood pressure decreased
Dyspnoea exertional (breathlessness or shortness of breath)
Fatigue (feeling of tiredness)
Influenza a virus test positive
Respiratory failure (inadequate gas exchange by the respiratory system)
Respiratory rate increased (excess breathing rate/min)
Rhonchi (abnormal breath sounds)

male:

n/a

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

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

Blood pressure decreased
Cough
Decreased appetite
Dyspnoea exertional (breathlessness or shortness of breath)
Fatigue (feeling of tiredness)
Forced expiratory volume decreased (decreased lung expired air volume)
Heart rate increased
Influenza a virus test positive
Respiratory rate increased (excess breathing rate/min)
Rhonchi (abnormal breath sounds)

30-39:

Abdominal pain upper
Blood pressure increased
Body temperature decreased
Chest discomfort
Cough
Decreased appetite
Distal intestinal obstruction syndrome (blockage of the intestines by thickened stool and occurs in individuals with cystic fibrosis)
Dizziness
Forced expiratory volume decreased (decreased lung expired air volume)
Hearing impaired

40-49:

Depression
Device dislocation
Dyspnoea (difficult or laboured respiration)
Fungal infection
Insomnia (sleeplessness)
Malaise (a feeling of general discomfort or uneasiness)
Migraine (headache)
Muscular weakness (muscle weakness)
Pain
Pseudomonas infection (pseudomonas infection is caused by a bacterium, pseudomonas aeruginosa)

50-59:

n/a

60+:

Acne (skin problems that cause pimples)
Chronic obstructive pulmonary disease (a progressive disease that makes it hard to breathe)
Dyspnoea (difficult or laboured respiration)
Scar
Weight decreased

What are the existing conditions these people have? *

Hypersensitivity: 3 people, 20.00%
Sleep Disorder: 2 people, 13.33%
Pseudomonas Infection (pseudomonas infection is caused by a bacterium, pseudomonas aeruginosa): 2 people, 13.33%
Wheezing (a high-pitched whistling sound made while you breath): 1 person, 6.67%
Obstructive Airways Disorder (a progressive disease that makes it hard to breathe): 1 person, 6.67%
Infective Pulmonary Exacerbation Of Cystic Fibrosis (severe infective lung disease with production of abnormally thick mucus): 1 person, 6.67%
Cystic Fibrosis Related Diabetes: 1 person, 6.67%
Cystic Fibrosis Lung (fibrosis with cyst in the lung): 1 person, 6.67%
Coughing Up Blood: 1 person, 6.67%
Cholestasis (a condition where bile cannot flow from the liver to the duodenum): 1 person, 6.67%

* Approximation only. Some reports may have incomplete information.

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