Theophylline Extended-Release (Generic) Tablets, slide 1 of 1

Theophylline Extended-Release (Generic) Tablets

Prescription Item

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Strength: 400-mg
  • Click to select 300-mg In stock
Count: 1 tablet

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Theophylline is a bronchodilator, which means it's a substance that works to open up airways. It's used to help ease breathing in those who suffer from respiratory disorders that arise from heart failure, pulmonary edema, bronchial asthma, chronic obstructive pulmonary disease (COPD) and other disorders. Customers may receive this drug under the name Theo-Dur.


Theophylline is used to relieve breathing in those who have breathing difficulty as a result of multiple respiratory/cardiovascular disorders, which may include heart failure, pulmonary edema, bronchial asthma and chronic obstructive pulmonary disease (COPD).

Possible Side Effects

Please contact your veterinarian immediately if you notice any of the following reactions: loss or increase of appetite, nausea, vomiting, diarrhea, nervousness, increased drinking or urination, seizures or abnormal heart rhythms. These symptoms usually disappear after the medication has been given for a while. An allergic reaction is possible in those allergic to Theophylline. Other side effects are possible.

Drug & Food Interactions

Notify your veterinarian of any other medications, including vitamins and supplements, your pet is taking before using Theophylline. This medication may decrease the absorption of digoxin (blood pressure support). It may also decrease the absorption of folate (folic acid). Other drug interactions may occur.


Do not give Theophylline to pets who are allergic to it or similar medications, such as xanthines, theobromine or caffeine. Pets who are very young, obese, debilitated, elderly, with severe heart disease, irregular heartbeats, stomach ulcers, hyperthyroidism, liver or kidney disease, hypoxia, high blood pressure or a seizure history may have trouble with this medication and it should only be used when your veterinarian thinks the benefits outweigh the risks.

This drug is FDA-approved for human use. However, it is common practice for veterinarians to prescribe such drugs for use in dogs and cats.

NOTE: For Generic Medications, picture displayed may not depict actual product. Generic medications may vary from one order to the next by size, color and shape depending on manufacturer.

  1. Prescribing Information

See all items by Theophylline

  • Item Number
  • Generic Name
  • Common Brand Name(s)
    Theo-Dur, Theo-24, Theochron
  • For Use With
    Dogs & Cats
  • Administration Form
  • Product Form
  • Health Condition
    Asthma, Respiratory Infections
  • Drug Type


Recommended Dosage

Use as directed by your veterinarian.

Storage Instructions

Store in well-closed containers at room temperatures 68° - 77°F. .


What is Theophylline?

Theophylline is an oral tablet that is classified as a bronchodilator. It helps to relax airways and make breathing easier in pets who suffer from multiple respiratory disorders.

What are the benefits of Theophylline?

  • Can help relieve breathing in pets suffering from a variety of cardiovascular/respiratory disorders.
  • FDA approved.
  • Easy to give tablets.

How is this medication given?

Theophylline is given orally preferably at the same time(s) daily exactly as directed by your veterinarian.

Always consult with your veterinarian if you have questions regarding the proper use of Theophylline.

How does this medication work?

Theophylline causes relaxation of the smooth muscles in the airways and lungs. Muscular relaxation increases the airway diameter and helps maximize the flow of air through them making breathing easier. Theophylline may also assist in draining excess fluid from the body through the kidneys.

What results can I expect?

Theophylline can help to make breathing easier for your pet but it does not cure underlying illnesses. Theophylline is effective after several hours so it is not effective for acute asthma attacks. Symptoms may return if medication is stopped.

Rating: 2.7 of 5 stars 4 Reviews 4 Reviews 2.8 out of 5 Stars

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Rating: 2.7 of 5 stars 2.8 / 5

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  • 5 out of 5 stars

    You can find a smaller dose...

    By on

    My 6 lb dog is on a much smaller dose than offered through Chewy's. My vet found a local compounding pharmacy that makes the liquid suspension. They also ship out of state. Ask your vet about compounding pharmacies.

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  • 1 out of 5 stars

    Needed 100mg - so no order

    By on

    Aside from lack of choice of strength - pricing per pill is just strange. My vet was out of this med, guess I'll just wait till they get it back in stock. Disappointed....

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  • 1 out of 5 stars

    Need 50mg or 25mg not 300 or 400

    By on

    My dog is prescribed 50mg 1/2 tab BID. Do they offer anything smaller than 300mg?

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  • 4 out of 5 stars

    Returning this order.

    By on

    There seems a problem with the size of this pill? There is no possible way, (no matter how you crush it down ) that is can give this to my cat. Could their be maybe a liquid that i purchase instead of this pill? Anyhow I'll be returning this item. Thank you very much.

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