Viagra and Questran drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Viagra (sildenafil citrate) and Questran (cholestyramine). Common drug interactions include drug ineffective among males.

The phase IV clinical study analyzes what interactions people have when they take Viagra and Questran. It is created by eHealthMe based on reports of 24 people who take the same drugs from the FDA, and is updated regularly.

What is Viagra?

Viagra has active ingredients of sildenafil citrate. It is often used in erection problems. eHealthMe is studying from 63,865 Viagra users. Check the latest studies of Viagra.

What is Questran?

Questran has active ingredients of cholestyramine. It is often used in diarrhea. eHealthMe is studying from 4,490 Questran users. Check the latest studies of Questran.

On May, 19, 2026

24 people who take Viagra and Questran together, and have interactions are studied.

What are the common drug interactions of Viagra and Questran, by gender? *:

female:

n/a

male:

Drug ineffective
Chronic kidney disease
Acute respiratory failure
Cerebrovascular accident (sudden death of some brain cells due to lack of oxygen when the blood flow to the brain is impaired by blockage or rupture)
Overdose
Aggression
Anger
Anorgasmia (type of sexual dysfunction in which a person cannot achieve orgasm, even with adequate stimulation)
Anxiety
Blood pressure increased

What are the common drug interactions of Viagra and Questran, 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:

Drug ineffective

50-59:

Chronic kidney disease
Hyperparathyroidism secondary (an abnormally high concentration of parathyroid hormone in the blood, resulting in weakening of the bones through loss of calcium-secondary)
Renal failure (kidney dysfunction)
Hypertensive heart disease
Nephrogenic anaemia (anaemia due to kidney disease)
Anorgasmia (type of sexual dysfunction in which a person cannot achieve orgasm, even with adequate stimulation)
Anxiety
Coma (state of unconsciousness lasting more than six hours)
Depression
Flushing (the warm, red condition of human skin)

60+:

Drug ineffective
Pain
Paraesthesia (sensation of tingling, tickling, prickling, pricking, or burning of a person's skin with no apparent long-term physical effect)
Vasodilatation (widening of blood vessels resulting from relaxation of smooth muscle cells within the vessel walls)
Androgen deficiency
Headache (pain in head)
Acute respiratory failure
Cerebrovascular accident (sudden death of some brain cells due to lack of oxygen when the blood flow to the brain is impaired by blockage or rupture)
Overdose
Aggression

What are the existing conditions these people have? *

Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 4 people, 16.67%
High Blood Pressure: 2 people, 8.33%
High Blood Cholesterol: 2 people, 8.33%

* Approximation only. Some reports may have incomplete information.

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