**Abstract**

To investigate the effect and the safety of Adenosine triphosphate disodium hydrate (ATP-2Na) for asthenopia. 40 subjects [35 females and 5 males, 25~87 years old (average: 62.5 years old)] with asthenopia ingested 200~300 mg/day ATP-2Na for 3 months. Before and after 1 and 3 months ingestion, subjects completed a questionnaire to determine their asthenopia symptom and fatigue symptom by visual analog scale (VAS). The scores were compared between before and after ingestion. 31 subjects completed a questionnaire for 1 month. The scores of asthenopia symptom before ingestion, 1 and 3 months were 4.05 ± 3.22, 2.67 ± 2.19 and 2.41 ± 2.16, respectively. The scores of fatigue symptom were 4.76 ± 3.05, 3.08 ± 2.93 and 3.10 ± 3.19, respectively. Both scores were significantly decreased (p < 0.005) at 1 month compared before ingestion. Three subjects had side effects (diarrhea for two, nausea for one), and all subjects improved by oral discontinuation. These results suggest that ATP-2Na is relatively early effective in improving asthenopia and accompanying fatigue symptoms.

**Keywords:** adenosine triphosphate disodium hydrate(ATP-2Na), asthenopia symptom, fatigue symptom, visual analog scale (VAS), 3 months
