Background) Nasal obstruction is mainly caused by CysLTs and this most disturbing symptom is often observed in patients with Japanese cedar pollinosis. In this study, pranlukast, a cysteinyl-leukotriene receptor antagonist was administered to patients with Japanese cedar pollinosis as a pre-seasonal drug to investigate the therapeutic effects. Methods) Twenty-nine patients (10 male ; 19 female, mean : 43.8 year-old) were enrolled and divided into 2 groups, including a pre-seasonal medication group and an in-seasonal medication group. The pre-seasonal medication group using pranlukast was started 1 week before the beginning of the pollen season. In contrast, the other group used pranlukast plus epinastine hydrochloride, a selective H
1 -antagonist, without receiving any pre-seasonal medication. The symptoms, QOL and Symptom medication scores were thereafter compared between those two groups. Results) All nasal symptoms of the pre-seasonal medication group were observed to significantly decrease in comparison to the in-seasonal medication group for the first 4 weeks of the pollen season. The symptom medication score of the pre-seasonal medication group was also significantly lower than that of the in-seasonal medication group during the pollen season. The QOL scores for outdoor activities, social activities and sleep of the pre-seasonal medication group were also significantly lower than those of the in-seasonal medication group during the pollen season. Conclusion) These data suggest that pranlukast might therefore be a useful pre-seasonal drug for patients with Japanese cedar pollinosis.
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