Precautions: Consult your veterinarian before using Phenylbutazone with phenytoin, valproic acid, oral anticoagulants such as warfarin, corticosteroids, chlorpheniramine,diphenhydramine, penicillin G, furosemideSalix, and other NSAIDS such as aspirin and flunixin Banamine, since interactions may occur. ; Phenylbutazone may affect laboratory test results for thyroid hormone. ; Not for use in horses hypersensitive allergic to phenylbutazone. ; Do not use in horses with stomach ulcers or a history of stomach ulcers, horses that are anemic, or have diseases of the bone marrow, kidney, liver, or heart. ; Do not use in pregnant or lactating horses unless benefits outweigh the risks. ; Avoid use in debilitated horses, foals, and ponies unless benefits outweigh the risks,since the possibility of toxic side effects is increased in these animals ; Side Effects:May see signs of oral or gastric ulcers. In adult horses these signs may include decreased appetite, weight loss, mild colic, poor performance, depression, lying down more than normal, diarrhea, accumulation of fluid under the belly, and anemia withsigns of pale gums and weakness. In foals may also see teeth grinding, drooling, weakness, and nursing for only shortperiods of time. Effects related to the kidney may result in changes in drinking or urination habits. Stop using phenylbutazone and consult your veterinarian if you notice any of the above side effects. ; If your horse experiences an allergic reaction to the medication, signs may include facial swelling, hives, scratching, sudden onset of diarrhea, shock, seizures, pale gums, cold limbs, or coma. If you observe any of these signs, contact your veterinarian immediately. Butapaste -phenylbutazone 20gm tube. I do not receive this product or any others in exchange for this article, I do get a commission for readers clicking the buy now links which helps to differ the cost of hosting this blog and I sincerely hope this article site helps you with your search for Vet Approved Rx products.