Equine Sciences Extension Program
Treatment — Internal Parasites
Table of Contents
In addition to the sanitation and management practices above, treating animals with specific drugs, commonly referred to as antihelminthics, is generally necessary to get effective control. These drugs remove the parasites from the intestinal tract. Thus the treated animal is relieved of the immediate damage or injury caused by parasites. But probably more important is removing the parasites which breaks the cycle. This serves to reduce contamination of the environment with transfer stages thereby limiting the spread of the infections and protecting animals from reinfection. In most cases, your veterinarian should administer antihelminthics. Follow his counsel and advice on a parasite control program.
A number of new drugs have been developed in recent years. Some are effective against all four of the important kinds of parasites and thus are referred to as "broad–spectrum"; in action. Others are most effective against one or two of the kinds of parasites and these are known as "specific" antihelminthics. A more recent drug has been developed that is injectable and is effective on all classes of parasites both in the digestive tract and migratory stage.
Most drugs are best administered by stomach tube, a procedure requiring a veterinarian’s knowledge and skill to obtain most effective action. Some of these drugs, and others, can be given by mixing the proper dose in the grain ration. When the feed method is used, give special attention to see that the medicated grain is consumed by the animal if you expect results.