Theophylline Extended-Release (Generic) Tablets
Prescription Item
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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.
UsesTheophylline 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 EffectsPlease 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 InteractionsNotify 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.
Precautions
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.
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Item Number159153
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Generic NameTheophylline
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Common Brand Name(s)Theo-Dur, Theo-24, Theochron
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For Use WithDogs & Cats
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Administration FormOral
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Product FormTablet
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Health ConditionAsthma, Respiratory Infections
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Drug TypeBronchodilator
Theophylline.
Use as directed by your veterinarian.
Storage InstructionsStore 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.
Customer Reviews

25% Recommend
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4 Reviews
4 Reviews
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You can find a smaller dose...
By PomFan on Apr 8, 2020
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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Needed 100mg - so no order
By crankyoldbroad on Mar 7, 2020
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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Need 50mg or 25mg not 300 or 400
By Stinky on Oct 14, 2019
My dog is prescribed 50mg 1/2 tab BID. Do they offer anything smaller than 300mg?
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Returning this order.
By Spazz on Jun 21, 2019
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.