Using Aminophylline Injections on Cats and Dogs

A type of bronchodilator, the designed purpose of aminophylline is to quickly relax the smooth muscles of the lungs, helping keep the airways open in patients suffering from an asthma attack or pulmonary edema (excessive fluid buildup in the lungs). Typically only used in a hospital setting or in patients with severe asthma, this drug also causes an increase in histamine release, which trigger an inflammatory response.

Aminophylline Injections should be used cautiously in patients with cardiac disease, gastrointestinal ulcers, hyperthyroidism, renal or hepatic disease, severe hypoxia or hypertension, or glaucoma. Taking this medication may cause cardiac arrhythmias to worsen. Elderly patients may be more prone to side effects, along with patients suffering from congestive heart failure. An intramuscular injection of aminophylline is extremely painful.

Aminophylline Injections should not be taken with sympathomimetic or beta adrenergic blockers, due to potential toxic synergism or antagonistic effects.

Drugs like allopurinol, cimetidine, clindamycin, erythromycin, lincomycin, or thiabendazole may increase the effects of aminophylline

Ciprofloxacin and enrofloxacin are likely to cause a reduced ability to metabolize aminophylline, resulting in toxicity.

Halothane might increase the risk of arrhythmias.

Isoproterenol can cause toxic synergism.

Ketamine can increase the risk of seizures.

Pancuronium bromide and sucralfate might decrease the effects of aminophylline.

Phenobarbital and phenytoin sodium increase the clearance of aminophylline, lessening its efficacy.

Dogs -- 6 - 11 mg/kg intramuscularly or intravenously every day
Cats -- 4 - 6.6 mg/kg intramuscularly or intravenously every day

Due to the narrow range within which this drug is actually therapeutic, the dosage should be determined by a veterinarian, and that dosage should be adhered to closely.