Theo-dur and Revatio drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Theo-dur (theophylline) and Revatio (sildenafil citrate). Common drug interactions include pneumonia bacterial among females and dyspnoea among males.

The phase IV clinical study analyzes what interactions people have when they take Theo-dur and Revatio. It is created by eHealthMe based on reports of 11 people who take the same drugs from the FDA, and is updated regularly.

What is Theo-dur?

Theo-dur has active ingredients of theophylline. It is often used in asthma. eHealthMe is studying from 4,451 Theo-dur users. Check the latest studies of Theo-dur.

What is Revatio?

Revatio has active ingredients of sildenafil citrate. It is often used in pulmonary hypertension. eHealthMe is studying from 44,849 Revatio users. Check the latest studies of Revatio.

On Aug, 09, 2026

11 people who take Theo-dur and Revatio together, and have interactions are studied.

What are the common drug interactions of Theo-Dur and Revatio, by gender? *:

female:

Pneumonia bacterial (pneumonia associated with bacterial infection)
Anaphylactic reaction (serious allergic reaction)
Drug hypersensitivity
Hypersensitivity
Nausea (feeling of having an urge to vomit)
Vomiting
Abdominal distension
Bronchiectasis (abnormal widening of the bronchi or their branches, causing a risk of infection)
Catheter site pain
Catheter site swelling

male:

Dyspnoea (difficult or laboured respiration)
Atrial fibrillation (fibrillation of the muscles of the atria of the heart)
Oedema peripheral (superficial swelling)
Hypoxia (low oxygen in tissues)
Insomnia (sleeplessness)
Platelet count decreased
Pneumonia
Respiratory failure (inadequate gas exchange by the respiratory system)
Abdominal pain upper
Disease progression

What are the common drug interactions of Theo-Dur and Revatio, 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:

n/a

50-59:

Nausea (feeling of having an urge to vomit)
Vomiting
Abdominal distension
Anaphylactic reaction (serious allergic reaction)
Bronchiectasis (abnormal widening of the bronchi or their branches, causing a risk of infection)
Catheter site pain
Catheter site swelling
Diarrhoea
Drug hypersensitivity
Dyspnoea (difficult or laboured respiration)

60+:

Respiratory failure (inadequate gas exchange by the respiratory system)
Dyspnoea (difficult or laboured respiration)
Abdominal pain upper
Disease progression
Dizziness
Lung disorder (lung disease)
Oedema peripheral (superficial swelling)
Hypoxia (low oxygen in tissues)
Atrial fibrillation (fibrillation of the muscles of the atria of the heart)
Insomnia (sleeplessness)

What are the existing conditions these people have? *

Primary Pulmonary Hypertension (primary high blood pressure that affects the arteries in the lungs and the right side of your heart): 9 people, 81.82%
Hyperuricaemia (level of uric acid in the blood that is abnormally high): 4 people, 36.36%
Dermatitis Allergic (inflammation of the skin due allergic reaction): 4 people, 36.36%
Constipation: 4 people, 36.36%
Chronic Obstructive Pulmonary Disease (a progressive disease that makes it hard to breathe): 4 people, 36.36%
Cardiac Failure: 4 people, 36.36%
Bronchitis Chronic (inflammation of the mucous membrane in the bronchial tubes- chronic): 4 people, 36.36%
Pneumonia: 3 people, 27.27%
Hypokalemia (low potassium): 3 people, 27.27%
Bronchiectasis (abnormal widening of the bronchi or their branches, causing a risk of infection): 3 people, 27.27%

* Approximation only. Some reports may have incomplete information.

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