*Prescription Required: Vetsource®, our pharmacy provider, may need to contact your veterinary hospital for prescription verification. Learn More
Theophylline is a bronchodilator. It works by relaxing muscles in the lungs and chest, making the lungs less sensitive to allergens and other causes of bronchospasm.
Side effects may include loss of appetite, nausea, vomiting, diarrhea, or nervousness at the beginning of treatment. These side effects are usually temporary and will disappear over a short time. If they do not, or your pet has a rapid heartbeat, or an increase in appetite, drinking or urination, contact your veterinarian. This medication can cause seizures at high doses. If so, contact your veterinarian immediately. May cause or worsen abnormal heart rhythms. This is not a complete list of side effects and others may occur. If any of these serious side effects are observed, contact your veterinarian.
Dogs and Cats
Theophylline relaxes the large air passages in the lungs to make breathing easier. It is used in the treatment of heart failure, pulmonary edema, bronchial asthma and chronic obstructive pulmonary disease.
Theophylline should be given orally as directed by your veterinarian.
This medication does not have an FDA approved indication for use in animals, but it is a common and acceptable practice for veterinarians to prescribe this human medication for use in animals.Make sure to tell your veterinarian what other medication or supplements you are giving to your pet as many drugs can interact with Theophylline. Quite often your veterinarian may prescribe two different medications, even if a drug interaction may occur. In this case, your veterinarian may vary the dose and/or monitor your pet more closely. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together. The medication is best given on an empty stomach and tablets should not be crushed or chewed.Allergic reactions to medications may occur. Be sure to inform VetSource and your veterinarian if your pet has any known drug sensitivities or allergies. If your pet displays symptoms of an allergic reaction, call your veterinarian immediately or go to a veterinary emergency clinic. Symptoms may include but are not limited to: swollen lips, tongue, face, airways; difficulty breathing; agitation; profuse salivation; vomiting; widespread hives and itching.