Theophylline-Etofylline

What Is Theophylline–Etofylline?

Theophylline–etofylline contains two closely related active ingredients:

• Theophylline: a bronchodilator from a group of medicines called methylxanthines. It relaxes the muscles around the airways.
• Etofylline: a chemical relative of theophylline that dissolves more easily in water. It adds to the bronchodilating effect and is included to allow different forms, including injections.

Drug class: Methylxanthine bronchodilator combination.

Approved and Common Prescribed Uses

Depending on the country and the label, this combination is used for:

• Asthma: to relieve and help prevent wheezing, cough, and shortness of breath caused by narrowed airways.
• COPD, including chronic bronchitis and emphysema: to ease breathing difficulty caused by reversible airway narrowing.
• Other conditions with reversible airway blockage, as directed by a doctor.

Slow-release forms are generally used for ongoing control. Quick-release or injectable forms may be used for short-term relief under medical supervision. This medicine does not take the place of emergency treatment for a severe attack.

Availability

This combination is sold under different brand names in some countries, and it is not available everywhere. Where it is not sold, theophylline is often prescribed on its own. A prescriber or pharmacist can confirm what applies locally.

Available Formulations and Strengths

Formulation	Notes
Immediate-release tablets	Used when faster action is wanted.
Sustained-release (retard or extended-release) tablets	Release the medicine slowly over many hours. Must be swallowed whole in most cases.
Injection	Given only by a healthcare professional, usually in a clinic or hospital.

Strengths are usually written as the amounts of each ingredient in milligrams (mg) per tablet or per milliliter of solution, and the ratio of etofylline to theophylline is fixed in each product. Available strengths differ by brand and country, so check the product label.

What Is the Recommended Dosage of Theophylline–Etofylline?

A licensed healthcare professional chooses the dose very carefully, because this medicine has a narrow safety range. Small increases in blood levels can cause side effects. The dose depends on:

• The condition being treated and how severe it is.
• Age: children and older adults clear the medicine differently.
• Body weight, which may be used when calculating dose for some patients.
• Liver function: liver disease can slow how fast the medicine leaves the body.
• Heart function: heart failure can raise blood levels.
• Smoking: smoking speeds up removal of the medicine, so smokers may need different dosing.
• Other medicines that raise or lower theophylline levels.

Kidney function matters less for theophylline itself, but tell your provider about any kidney problems.

Dosage Forms

• Tablets (immediate-release and sustained-release)
• Injection, given by a healthcare professional

General Use Information

Take this medicine exactly as prescribed, at the same times each day. Do not crush, chew, or split sustained-release tablets unless the label says it is allowed. Using more than prescribed will not improve breathing and can cause serious side effects. Your healthcare professional may order blood tests to check the level of theophylline in your body.

How Theophylline–Etofylline Works

Both ingredients relax the smooth muscle that wraps around the airways. When the muscle relaxes, the airways open wider and air moves in and out more easily. These medicines may also reduce some of the airway swelling and irritation that happen in asthma and COPD.

This medicine helps manage symptoms but does not cure asthma or COPD. It is usually not the first choice today, because inhaled medicines tend to have fewer side effects. It is often used as an add-on, or when inhalers are not enough or not available.

Is a Prescription Required to Buy Theophylline–Etofylline Online?

Yes. In most countries, theophylline–etofylline is sold by prescription only.

Which Specialist Can Help?

• A pulmonologist (lung specialist) commonly manages COPD and harder-to-control asthma.
• An allergist/immunologist often treats allergic asthma.
• A primary care provider or pediatrician may also prescribe it and follow the patient over time.

Buying Safely

• Buy only from licensed pharmacies that ask for a valid prescription.
• Be wary of sites that sell this medicine without a prescription or at prices that seem too low. Such products may be counterfeit, expired, badly stored, or have the wrong strength, which is especially risky for a medicine with a narrow safety range.
• Make sure the package is sealed, properly labeled, and has an expiration date. If anything looks odd, ask a pharmacist.

Side Effects of Theophylline–Etofylline

Many people tolerate this medicine, but side effects can occur, particularly if blood levels are high. Not everyone will have them.

Common Side Effects

• Nausea or vomiting
• Stomach upset or heartburn
• Headache
• Trouble sleeping or restlessness
• Nervousness, irritability, or shakiness
• Fast or pounding heartbeat
• Increased urination
• Diarrhea or loss of appetite

Serious Side Effects

These are uncommon but may signal that the level of medicine in the body is too high:

• Irregular or very fast heartbeat
• Seizures (convulsions)
• Severe or repeated vomiting
• Confusion, severe agitation, or tremor
• Allergic reactions: rash, hives, swelling of the face, lips, or tongue, or trouble breathing
• Low potassium or high blood sugar levels
• Stomach bleeding, shown by black stools or vomit that looks like coffee grounds

When to Get Medical Help Right Away

Seek emergency care if there is:

• A seizure or fainting
• Chest pain or a very fast or irregular heartbeat
• Severe vomiting that does not stop
• Severe confusion or trouble staying awake
• Swelling of the face, lips, tongue, or throat, or severe trouble breathing

Contact a healthcare professional soon if you have ongoing nausea, shakiness, or sleep problems, or if your symptoms are getting worse.

Drug Interactions

Many medicines change theophylline levels, and some of these interactions can be serious. Give your specialist and pharmacist a full list of everything you use, including any new medicine started during treatment.

Prescription Medicine Categories

• Medicines that raise theophylline levels, which can lead to toxicity. Examples include certain antibiotics (such as ciprofloxacin and erythromycin or clarithromycin), fluvoxamine, cimetidine, some heart medicines, and some antifungals.
• Medicines that lower theophylline levels, which can reduce effect. Examples include certain seizure medicines (such as phenytoin, carbamazepine, and phenobarbital) and rifampin.
• Other bronchodilators and stimulants, including beta-agonists, other xanthines, and stimulant medicines, which may add to heart and nervous system effects.
• Diuretics (“water pills”) and other medicines that lower potassium.
• Lithium, some sedatives, and certain anesthetics, whose effects may change when taken with theophylline.
• Vaccines and treatments that your doctor may adjust around illness or fever, since fever and viral illness can raise theophylline levels.

Over-the-Counter (OTC) Medicines

• Cimetidine, some cold and allergy products, and decongestants may change levels or add to heart effects.
• Medicines or drinks containing caffeine may add to side effects such as jitteriness and rapid heartbeat.

Supplements, Herbal Products, and Lifestyle Factors

• St. John’s wort can lower theophylline levels.
• Stimulant-type supplements, such as those with high caffeine, ephedra-like ingredients, or bitter orange, may add to side effects.
• Smoking (including some cannabis smoking) lowers theophylline levels. Starting or stopping smoking can change how much medicine you need.
• Large changes in diet, such as very high-protein or very high-carbohydrate meals, may also affect levels.

Do not start, stop, or change any medicine, supplement, or smoking habit without telling your healthcare professional.

Safety & Important Considerations

Narrow Safety Range

The difference between a helpful level and a harmful level is small. Blood tests may be used to guide the dose, especially when starting, when the dose changes, or when other medicines or illnesses are added.

Liver Disease

The liver breaks down theophylline. People with liver disease may need lower doses and closer monitoring.

Heart Disease

Theophylline can raise heart rate and may trigger rhythm problems. Heart failure and other heart conditions can also raise blood levels.

Kidney Disease

Dose changes are not usually based on kidney function alone, but share any kidney conditions with your provider.

Pregnancy and Breastfeeding

• Tell your healthcare professional if you are pregnant, planning pregnancy, or breastfeeding.
• Theophylline passes into breast milk and may cause irritability or poor sleep in nursing infants.
• Uncontrolled asthma also poses risks in pregnancy, so decisions about treatment should be made with a specialist.

Children and Older Adults

• Children: Young infants clear the medicine slowly, and dosing needs special care. Children may show behavior changes or sleep trouble.
• Older adults: They may be more sensitive and may have heart, liver, or other conditions that affect levels.

Conditions to Discuss Before Starting

Tell your healthcare professional if you have, or have had:

• Heart disease, irregular heartbeat, or high blood pressure
• Seizures
• Stomach or intestinal ulcers, or acid reflux
• Liver disease
• Thyroid disease
• Diabetes
• Low potassium
• Fever or an ongoing infection
• Any allergy to theophylline, caffeine-like medicines, or related drugs

Monitoring

Your care team may:

• Check blood levels of theophylline
• Monitor heart rate, heart rhythm, and blood pressure
• Check potassium, blood sugar, and liver function in some patients
• Track symptoms and how often you need rescue medicine

Signs of Too Much Medicine

Contact a healthcare professional right away if you develop persistent vomiting, a racing heartbeat, tremor, confusion, or seizures.

Safety Information From Regulators

Regulators note that theophylline has a narrow safety range and many drug interactions. Read the current prescribing information and patient leaflet that come with your medicine, and follow local guidance.

Who This Medication Is For

Theophylline–etofylline is intended for:

• People with asthma who need help keeping their airways open, as decided by their healthcare professional.
• People with COPD who have reversible airway narrowing and need added treatment.

It is generally used when inhaled medicines are not enough, are not suitable, or are not available. A specialist decides if it is appropriate after reviewing symptoms, lung tests, prior treatments, and overall health.

Who Should Not Take Theophylline–Etofylline

Do not use this medicine if:

• You are allergic to theophylline, etofylline, or related xanthine medicines (such as caffeine or theobromine) or any other ingredient in the product.
• You have an active peptic ulcer or severe uncontrolled heart rhythm problems, unless a specialist has decided it is safe.
• You have uncontrolled seizures, unless a specialist has decided it is safe.
• You recently had a heart attack or have serious heart disease, unless a specialist has decided it is safe.

Important Precautions

Use extra caution and speak with your specialist if you have heart disease, liver disease, thyroid problems, seizure disorders, stomach ulcers, diabetes, or an infection with fever. Use extra caution in newborns, infants, and older adults.

What to Do If You Miss a Dose

• If you miss a dose, take it as soon as you remember, unless it is almost time for the next dose. In that case, skip the missed dose.
• Never double up or take extra doses to catch up.
• Do not crush or split sustained-release tablets to make up a missed dose.
• If you often forget doses or are unsure what to do, contact a licensed healthcare professional or pharmacist.
• If symptoms worsen after a missed dose, follow your asthma or COPD action plan and get medical help if needed.

Related medications to Theophylline–Etofylline

Other medicines used for similar conditions include:

• Theophylline alone or doxofylline (a related xanthine, available in some countries)
• Short-acting bronchodilators (such as albuterol/salbutamol)
• Long-acting bronchodilators: LABAs and long-acting muscarinic antagonists (LAMAs)
• Inhaled corticosteroid combinations, such as ICS/LABA inhalers
• Leukotriene receptor antagonists (such as montelukast), mainly for asthma
• Roflumilast, which is used in some people with severe COPD

These options differ in how they are taken, how they work, and their side effects. Do not switch or stop treatment without guidance. Any change should be made after consulting a licensed medical specialist.

Storage Instructions

• Store at room temperature, usually below 86°F (30°C), unless the label says otherwise.
• Keep tablets dry, in the original package, and away from moisture, such as steamy bathrooms.
• Protect from light and heat.
• Keep injection ampoules or vials in their original packaging, and use them only as directed by a healthcare professional.
• Keep out of reach and sight of children and pets. Accidental swallowing can be dangerous, especially for small children.
• Dispose of expired or unused medicine as advised by your pharmacist or local disposal program.

Disclaimer:

This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Patients must consult a licensed pulmonologist, allergist, or other relevant medical specialist before starting, changing, or stopping treatment. Treatment decisions must be based on a full clinical evaluation by a qualified specialist. Always follow the prescribing information and patient leaflet provided with your medicine.