This research was conducted to prove the ability of betel nut extract (Areca catechu) in causingdegradation of sperm motility on rats (Rattus norvegicus) strain Wistar. This research used 2-3 monthsage, 200-250 g body weight of male white rats Rattus norvegicus strain Wistar. The rats were dividedinto 5 groups in equal number, 3 rats each group. They were a control group without treatment and 4treatment groups which were given different doses of betel nut extract for 7 days, i.e., 1, 2, 3, and 4 g/200g body weight respectively. The result showed that increasing doses of betel nut extract can result indegradation of sperm motility significantly (P0.05).Keywords: Areca catechu, Rattus norvegicus, sperm motility
                        
                        
                        
                        
                            
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