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Herbs are common resources in, both pure products and traditional drug production. This study aimed to investigate the occurrence of artemisinin in Artemisia absinthium L .and test the anticoccidian effects of plant extract in broilers. Anticoccidial effects of the plant extract were tested on chicken challenged with Eimeria tenella. The in vivo investigation was carried out on 150 heavy line broilers (Arbor acres) of both sexes. One hundred fifty, 21 day old chickens were divided into five groups consisting of 30 chicks each. At the age of 21 day, the chicken from first four groups (A to D) were infected with Eimeria tenella sporulated oocysts at a dose of 20.000 per chicken. The negative control consisted of group E chickens that were not infected or treated. The infected chickens were treated with absinthium extracts at the dosages of 1, 2 and 3 mg/kg per day. The results indicated that Artemisia absinthium extract can reduce the severity of coccidial infection induced by Eimeria tenella. The anticoccidial effects of A. absinthium extracts caused significant decrease in output number of oocysts per gram of faeces in chickens challenged with Eimeria tenella. [ABSTRACT FROM AUTHOR]