Vitamin d3 and Questran drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Vitamin d3 (cholecalciferol) and Questran (cholestyramine). Common drug interactions include bronchitis among females and fatigue among males.

The phase IV clinical study analyzes what interactions people have when they take Vitamin d3 and Questran. It is created by eHealthMe based on reports of 34 people who take the same drugs from the FDA, and is updated regularly.

What is Vitamin d3?

Vitamin d3 has active ingredients of cholecalciferol. It is often used in heart health. eHealthMe is studying from 32,171 Vitamin d3 users. Check the latest studies of Vitamin d3.

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 Jul, 25, 2026

34 people who take Vitamin d3 and Questran together, and have interactions are studied.

Vitamin d3 and Questran drug interactions.

What are the common drug interactions of Vitamin D3 and Questran, by gender? *:

female:

Bronchitis (inflammation of the mucous membrane in the bronchial tubes)
Cheilitis (infection of lips)
Chronic sinusitis (long lasting inflammation of the paranasal sinuses)
Confusional state
Cystic fibrosis (disease of the secretary glands)
Cystitis (inflammation of the wall of the bladder)
Decreased appetite
Haematocrit decreased
Haemoglobin decreased
Haemorrhage (bleeding)

male:

Fatigue (feeling of tiredness)
Cough
Pain
Platelet count increased
Pneumonia
Thrombocytopenia (decrease of platelets in blood)
Abdominal discomfort
Acute coronary syndrome (acute chest pain and other symptoms that happen because the heart does not get blood)
Acute respiratory failure
Arteriosclerosis coronary artery (thickening and hardening of arteries- coronary artery)

What are the common drug interactions of Vitamin D3 and Questran, by age (0-1 to 60+)? *:

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

Migraine (headache)
Sexual dysfunction (difficulty experienced by an individual or a couple during any stage of a normal sexual activity)

30-39:

Osteopenia (a condition where bone mineral density is lower than normal)
Pancreatic insufficiency
Progressive multifocal leukoencephalopathy (rapidly progressive neuromuscular disease caused by opportunistic infection of brain cells)
Pseudomonas infection (pseudomonas infection is caused by a bacterium, pseudomonas aeruginosa)
Splenic artery aneurysm (enlargement of splenic artery)
Staphylococcal infection (an infection with staphylococcus bacteria)
Tumour marker increased
White blood cell count increased
Fatigue (feeling of tiredness)
Abdominal discomfort

40-49:

Blood pressure increased
Bronchitis (inflammation of the mucous membrane in the bronchial tubes)
Hypophosphataemia (electrolyte disturbance in which there is an abnormally low level of phosphate in the blood)
Muscle spasms (muscle contraction)
Myalgia (muscle pain)
Nervousness
Oedema peripheral (superficial swelling)
Tachycardia (a heart rate that exceeds the range of 100 beats/min)
Urinary tract disorder

50-59:

Anxiety
Contusion (a type of hematoma of tissue in which capillaries)
Cough
Dyspnoea (difficult or laboured respiration)
Fatigue (feeling of tiredness)
Haematocrit increased
Hyperhidrosis (abnormally increased sweating)
Iron deficiency
Musculoskeletal pain (pain affects the bones, muscles, ligaments, tendons, and nerves)
Pain

60+:

Dyspnoea (difficult or laboured respiration)
Nausea (feeling of having an urge to vomit)
Erythema (redness of the skin)
Faeces discoloured
Fatigue (feeling of tiredness)
Flatulence (flatus expelled through the anus)
Gait disturbance
Glossodynia (a burning or painful sensation in the tongue)
Insomnia (sleeplessness)
Intestinal obstruction

What are the existing conditions these people have? *

Crohn's Disease (a condition that causes inflammation of the gastrointestinal tract): 6 people, 17.65%
High Blood Pressure: 5 people, 14.71%
Depression: 5 people, 14.71%
Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 4 people, 11.76%
Multiple Myeloma (cancer of the plasma cells): 4 people, 11.76%
Stress And Anxiety: 3 people, 8.82%
Pain: 3 people, 8.82%
High Blood Cholesterol: 3 people, 8.82%
Renal Cell Carcinoma (a kidney cancer): 2 people, 5.88%
Primary Myelofibrosis (primary disorder of the bone marrow): 2 people, 5.88%

* Approximation only. Some reports may have incomplete information.

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