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BACKGROUND:Zingiber cassumunar Roxb.,commonly known as Ph/ai in Thai,has been used as a traditional medicine in Thailand for the treatment of various diseases,including inflammation and chronic airway disease.OBJECTIVE:The purpose of this study was to assess the antihistaminic effect of Ph/ai on skin testing.DESIGN,SETTING,PARTICIPANTS AND INTERVENTION:This was a randomized,open-label,three-way crossover study.Twenty allergic rhinitis (AR) patients were enrolled.In randomized sequence,patients received a single dose of Phlai capsules (100 or 200 mg) or Ioratadine (10 mg) with a washout period of 1 week between each treatment.MAIN OUTCOME MEASURES:Skin prick testing for histamine and common aeroallergen (house dust mite) were performed before treatment and after 1,2,3,4,6,8,12 and 24 hours of treatment.The main treatment outcomes were the mean wheal and flare responses to the skin prick test after treatment.RESULTS:Both 100 mg and 200 mg Ph/ai doses suppressed wheal and flare responses to house dust mite allergen,but only 200 mg of Phlai capsules significantly suppressed wheal and flare responses to histamine.Repeated measures analysis of variance showed that Ioratadine caused more wheal and flare suppression than Phlai capsules in responses to the histamine skin prick test.However,there were no significant differences among the effects of 100 mg Ph/ai capsules,200 mg Ph/ai capsules and Ioratadine in suppression of wheal and flare induced by the mite skin prick test.Both doses of Phlai were well-tolerated with no adverse events.CONCLUSION:Both 100 mg (compound D 4 mg) and 200 mg (compound D 8 mg) Phlai capsules,when taken as a single therapeutic dose,inhibited skin reactivity to histamine and mite skin prick tests in AR patients.