NOW Pets Pet Allergy contains natural botanicals that may help to maintain normal histamine levels. NOW Pets Pet Allergy has been formulated by renowned veterinarian Dr. Barbara Royal, DVM, CVA, Founder of The Royal Treatment Veterinary Center.'For Dogs/Cats'Veterinarian Recommended'Active Ingredients per Chewable Tablet:Quercetin 100 mgNettle Leaf 100 mgTurmeric Root Extract 60 mgBromelain 50 mgBurdock Root 50 mgLicorice Root 50 mg'Inactive Ingredients: Calcium Carbonate, Cellulose, Cod Powder, Silica, Stearic Acid, Tuna Flavor.Directions for UseDogs:'Up to 20 lbs. ' tablet twice daily'21 to 40 lbs. 1 tablet twice daily'41 to 80 lbs. 2 tablets twice daily'Over 81 lbs. 3 tablets twice daily'Cats:'Up to 20 lbs. ' tablet once daily'Cautions: Safe use in pregnant animals or animals intended for breeding has not been proven.'If animal's condition worsens or does not improve, stop product administration and consult your veterinarian. Long term use may cause or contribute to water retention, hypertension and other side effects. Not to be used with blood thinners.'An examination from a veterinarian is recommended prior to using this product'Warnings: For animal use only. Keep out of the reach of children and animals. In case of accidental overdose, contact a health professional immediately.