A Phase 2 interventional study of Modified Xiao-Feng Powder + Antiallergics and Placebo + Antiallergics in Chronic Urticaria, sponsored by Prof. Lin Zhixiu. Completed at 1 site in Hong Kong. Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2026-07-27.
Sponsored by Prof. Lin Zhixiu · Phase 2, Interventional, and Treatment
Urticaria is a common skin disorder and 15-25% of people experience at least one attack of urticaria during their lifetime. Urticaria can be divided into acute urticaria (AU) and chronic urticaria (CU). CU is more common in adults, and affects women more frequently than men. According to Chinese medicine (CM) theory, CU is known as Yin Zhen. Nowadays, CM is widely used for managing CU in Hong Kong and mainland. Among different Chinese herbal formulae for urticaria, Xiao-Feng Powder (XFP), also known as Wind-Dispersing Powder, is one of the most frequently used Chinese herbal formulae for CU.
This study used modified Xiao-Feng Powder (mXFP) to evaluate the effectiveness and safety of mXFP in treating CU. Hence, a double-blind, randomised, placebo-controlled clinical trial design with strong scientific rigor will be employed in this study, and it would be able to provide robust clinical evidence on the efficacy and safety of mXFP for CU.
Urticaria is a common skin disorder and 15-25% of people experience at least one attack of urticaria during their lifetime. Urticaria can be divided into acute urticaria (AU) and chronic urticaria (CU) according to the disease duration. CU is classified as either chronic autoimmune urticaria or chronic idiopathic urticaria.
In Chinese medicine theory, Urticaria is usually associated with either internal or external wind pathogen. Wind as a pathogenic factor is characterized by sudden onset and rapid changes in symptoms, and when resulting from an internal deficiency, it often leads to dryness.
Several research groups have conducted clinical studies to evaluate the efficacy of Chinese herbal medicine for the treatment of CU in recent decades. Among different Chinese herbal formulae for urticaria, Xiao-Feng Powder (XFP), also known as Wind-Dispersing Powder, is one of the most frequently used Chinese herbal formulae for CU, also has been widely used in Chinese medicine dermatology to expel wind and eliminate dampness, clear heat, nourish the blood and stop itchiness. Moreover, other researchers have found that XFP is effective in inhibiting inflammation, allergy, and oxidative stress in allergic skin diseases.
Investigators hypothesize that mXFP is effective and safe for the treatment of CU. In this study, eligible subjects will be randomized to receive either mXFP or placebo twice daily for 12 weeks followed by post-treatment visits at week 16. Subjects will take the standard therapy of antihistamines regularly for the first 6 weeks and then on on-demand basis for the next 6 weeks during the treatment period.
214 studies on the registry are indexed under Chronic Urticaria; 47 are open to participants now.
This study's enrollment of 58 is below the median of 83 across 164 interventional studies indexed under Chronic Urticaria.
Browse Chronic Urticaria studies →Prof. Lin Zhixiu is the lead sponsor of 2 studies on the registry; none are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
Modified Xiao-Feng Powder granules will be taken twice daily for 12 weeks
Drug: Modified Xiao-Feng Powder + Antiallergics
Placebo granules will be taken twice daily for 12 weeks
Other: Placebo + Antiallergics
Modified Xiao-Feng Powder granules twice daily for 12 weeks plus Bilastine 20mg once daily for the first 6 weeks, and on-demand for the following 6 weeks.
Placebo granules twice daily for 12 weeks plus Bilastine 20mg once daily for the first 6 weeks, and on-demand for the following 6 weeks.
Change of Urticaria Activity Score (UAS7)
The UAS combines daily wheal numbers (0 = none, 1 = \< 20 wheals/24 h, 2 = 20-50 wheals/24 h, and 3= \> 50 wheals/24 h or large confluent areas of wheals), and pruritus intensity (0 = none, 1 = present but not annoying or troublesome, 2 = troublesome but does not interfere with normal daily activity or sleep, and 3 = severe pruritus, which is sufficiently troublesome to interfere with normal daily activity or sleep). The score ranges from 0 to 42 weekly. The highest score, the more severe of urticaria activity.
Time frame: 12 weeks
Change of Urticaria Activity Score (UAS7)
The UAS combines daily wheal numbers (0 = none, 1 = \< 20 wheals/24 h, 2 = 20-50 wheals/24 h, and 3= \> 50 wheals/24 h or large confluent areas of wheals), and pruritus intensity (0 = none, 1 = present but not annoying or troublesome, 2 = troublesome but does not interfere with normal daily activity or sleep, and 3 = severe pruritus, which is sufficiently troublesome to interfere with normal daily activity or sleep). The score ranges from 0 to 42 weekly. The highest score, the more severe of urticaria activity.
Time frame: 6 weeks and 16 weeks
Change of Urticaria Control Test (UCT)
It collects retrospective information about the symptoms and quality of life impairment over the past 4 weeks. The lowest UCT score possible is 0 (no control) and the highest score possible is 16 (complete control). A score ≥12 indicates well-controlled urticaria, while a score of ≤11 points towards poor disease control.
Time frame: 6 weeks, 12 weeks and 16 weeks
Change of Visual Analog Scale of Itch Severity (VAS)
The VAS is a scale consisting of a 10 cm long line for measuring itch intensity and it has high reliability and concurrent validity. The highest score, the more itchiness.
Time frame: 6 weeks, 12 weeks and 16 weeks
Change of Urticaria Quality of Life Questionnaire (CU-Q2oL)
CU-Q2oL is a disease-specific questionnaire to measure the impact of disease on subjects' health-related quality of life in the last 2 weeks. The highest score, the poor quality of life.
Time frame: 6 weeks, 12 weeks and 16 weeks
Change of Angioedema Activity Score (AAS)
AAS is to assess disease activity in subjects with recurrent angioedema. The score ranges from 0 to 10 daily. The highest score, the more severe of the edema.
Time frame: 6 weeks, 12 weeks and 16 weeks
Change of Immunoglobulin E (IgE) test
To measure the change of IgE level between baseline and week 12
Time frame: 12 weeks
Change of microbiota test
To compare the presence and the relative amounts of some members of gut microbiota among patients with CU between baseline and week 12.
Time frame: 12 weeks
The use of concomitant drugs
The dose of using the standard therapy of the antihistamines, Bilastine during study period will be compared between each study follow up visit throughout the study
Time frame: Baseline, 6 weeks, 12 weeks and 16 weeks
Plan to share: No
This study is completed, as verified in Jul 2026. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Prof. Lin Zhixiu