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Page 1 United States Patent (19) Tisdale 54 MEDICATION AND United States Patent (19) 11 Patent Number: 4,789,548 Tisdale 45) Date of Patent: Dec. 6, 1988 54 MEDICATION AND METHOD FOR dogs, which medication includes a time release capsule TREATING HEARTWORMS IN DOGS or tablet dosage structure which is characterized either (76) Inventor: John W. Tisdale, 935 S. 3 Notch St., by discrete elements (capsule) or an outer layer or lay Andalusia, Ala. 36420 ers (tablet) of vasoconstricting and bronchial dilating medications and an inner, time-released layer or pellets (21) Appl. No.: 855,471 of diethylcarbamazine. The vasoconstrictors and bron 22 Filed: Apr. 24, 1986 chial dilators are designed to counteract life-threatening 5ll Int. Cl'................................................ A61 3/06 vasodilation and bronchial constriction resulting from 52 U.S. C. .................................... 424/472; 424/464; the release of acetylcholine by the dog when the heart 424/474; 427/3 worms are attacked by the diethylcarbamazine. The 58 Field of Search ............... 424/492, 489, 451, 463, solid dosage structure can be constructed by layering 424/469, 474, 457, 468, 469, 465, 421, 472 such vasoconstrictors and bronchial dilators as predni sone, ephedrine, digoxin and dextroamphetamine sul (56). References Cited fate in separate layers or combining these ingredients in U.S. PATENT DOCUMENTS a single layer separated from the diethylcarbamazine by 2,921,001 1/1960 McDermott .......................... 424/0 a time-release substance such as gelatin. The capsule 2,928,770 3/1960 Bardami .......... ... 424/469 dosage structure includes discrete beads or elements of 2,991,226 7/1961 Millar et al. .... ... 424/499 the medications in a capsule containing a time release, 3,184,386 5/1965 Stephenson ..., ... 424/471 therapeutic dosage of the diethylcarbamazine. Alterna 3,279,997 10/1966 Schenzer ............. ... 424/471 tively, the vasoconstrictors and bronchial dilator medi 3,577,512 5/1971 Shepherd et al. ... ... 424/471 cations can be injected or administered orally prior to 3,992,338 11/1975 Estevenel et al. .................. 424/469 treatment with the diethylcarbamazine according to the Primary Examiner-Thurman K. Page method of this invention. Assistant Examiner-L. R. Horne Attorney, Agent, or Firm-John M. Harrison (57) ABSTRACT A medication and method for treating heartworms in 13 Claims, 1 Drawing Sheet %) 5×2XS. & U.S. Patent Dec. 6. 1988 4,789,548 o 4,789,548 1. 2 discloses the use of diphenylamine as a detoxicant for MEDICATION AND METHOD FOR TREATING drugs administered to animals. HEARTWORMS IN DOGS I have found through extensive experience and obser vation in using the chemical Caricide or diethylcarbam BACKGROUND OF THE INVENTION 5 azine, that upon absorption into the bloodstream of a 1. Field of the Invention dog and upon making contact with adult heartworms in This invention relates to the treatment of heartworms the heart of the dog, the diethylcarbamazine causes or adult filaria in the heart and circulatory systems of release of a toxin by the heartworms into the blood dogs. More particularly, the invention relates to a com stream. This toxin causes the parasympathetic system of bined preventative treatment and therapeutic treatment 10 the dog to produce acetylcholine, which, in turn, causes for dogs infested with adult filaria by using vasocon massive vasodilation and bronchial constriction in the strictors and bronchial dilators, as well as cardiac and dog. This condition produces a sudden fall in blood sympathetic stimulants to counteract the effects of ther pressure, resulting in respiratory depression, heart fail apeutic treatment with diethylcarbamazine. Since it is ure and death from shock, a syndrome which is similar speculated that the treatment of adult filaria with dieth 15 to the effect caused by a bee sting or other toxic insect ylcarbamazine results in the release of a toxin which sting or bite. Some animals are hypersensitive to this causes the body to secrete acetylcholine, a chemical toxin released by the heartworms and death occurs which acts to produce massive vasodilation and bron rapidly after treatment by the diethylcarbamazine. If chial constriction in the animal, treatment of the adult the animal is not hypersensitive to the toxin and is not filaria requires application of both preventative and 20 unduly affected by the massive vasodilation and bron therapeutic medicine. The preventative treatment is chial constriction caused by the acetylcholine it will designed to use certain vasoconstricting, bronchial di recover, since the adult heartworms are destroyed by lating and/or cardiac and sympathetic stimulant medi contact with the diethylcarbamazine. I have noted that cation such as prednisone, ephedrine, digoxin and dex dogs which exhibit this hypersensitivity to the toxin troamphetamine sulfate to counteract the undesirable 25 released by the heartworms upon contact with the di vasodilation and bronchial constriction with resulting ethylcarbamazine have been saved by injections of cardiac weakening in dogs which are treated with the adrenaline and atropine immediately after the reaction diethylcarbamazine. took place. Accordingly, the incorporation of anti reactant medicines by injection, as well as in a capsule The adult heart worm parasite or "filaria'slowly and 30 or tablet with the diethylcarbamazine on a time-release painfully kills hundreds of thousands of dogs annually. basis, will control the undesirable side effects resulting The parasite is particularly prolific in the coastal states, from massive vasodilation and bronchial constriction where it is estimated that at least 80 percent of all dogs which causes weakening of the heart due to the toxin which remain outside in mosquito-infested areas will released by the adult heartworms and the acetylcholine have an infestation of heartworms before they reach 35 produced by the body as a result of this toxin release. three years of age. None of the currently used veteri Specifically, it has been found that medications such as nary treatments are highly effective and safe, and most ephedrine, digoxin, dextroamphetamine sulfate and cause severe pain, swelling and in some cases, necroses prednisone can be used as vasoconstrictors, bronchial of the tissues. dilators and cardiac and sympathetic stimulants, as well 2. Description of the Prior Art as anti-inflammatory agents, to counteract the effect of Diethylcarbamazine has been used for years under a treating adult heartworms with diethylcarbamazine in a variety of trademarks such as "Caricide', a trademark capsule or tablet dosage structure. of the American Cyanimid Company, for the treatment Accordingly, it is an object of this invention to pro of adult filaria or "filiariasis” in dogs. Caricide was used vide a new and improved method and dosage structure during Word War II to treat filiariasis in human patients 45 for treating heartworms or filiariasis in dogs or other in the south pacific theatre where infestation became a animals by initially pretreating the dogs by injection, problem in American troops in that area. Diethylcar tablets or capsules to effect vasoconstriction and bron bamazine was used throughout the 1950's and 1960's by chial dilation and subsequently introducing diethylcar veterinarians as a successful treatment of healthy dogs bamazine into the blood stream for destroying the heart for infestations of dirofilaria immitis, which is the most 50 WOS. common species of adult filaria infecting dogs in the Another object of this invention is to provide a new coastal United States. Sometime after the era of the and improved method for treating animals which are 1960's, Caricide was discontinued due to complaints susceptible to filiariasis, by the steps of initially pretreat that various side effects and occasional deaths occurred ing the animal with vasoconstrictors, bronchial dilators from its use in heavily affected dogs having large num 55 and cardiac and sympathetic stimulants and subse bers of worms in the heart. This supposed drug-sen quently treating the adult heartworm condition with sitivity reaction was noted to be more prevalent in weak diethylcarbamazine. and emaciated dogs which were subjected to long Yet another object of the invention is to provide a standing stress from the infestataions and it was ob method for treating dogs afflicted with filiarasis, which served to only occurr in a small percentage of those method includes the steps of administering ephedrine, dogs treated. digoxin, dextroamphetamine sulfate and prednisone to U.S. Pat. Nos. 2,467,893, 2,467,894, and 2,467,895, serve as vasoconstrictors, bronchial dilators, cardiac dated Apr. 19, 1949, to Kushner, el al, U.S. Pat. No. and sympathetic stimulants and anti-inflammatory 2,643,255, dated June 23, 1953, to Gustave, et all and agents, respectively, and subsequently treating the ani U.S. Pat. No. Re. 23,701, dated Aug. 18, 1953, to 65 mal with diethylcarbamazine to kill the heartworms. Stewart, et al, disclose the use of carbamyl compounds Yet another object of this invention is to provide a as treating agents for filariasis in veterinary practice. new and improved solid dosage structure for treating U.S. Pat. No. 4,172,118, dated Oct. 23, 1979, to Baetz, animals which are subject to filariasis, which solid dos 4,789,548 3 4. age structure is characterized by one or mroe pretreat ment layers of a vasoconstrictor, bronchial dilator and DESCRIPTION OF THE PREFERRED cardiac and sympathetic stimulant and an inner, time EMBODIMENTS release treatment layer of diethylcarbamazine
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