Condition category
Circulatory System
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Chronic venous disease (CVD) is a common condition that affects the veins of the legs. These veins carry blood from the legs to the heart. Veins have a series of valves that open and close to direct blood from the surface of the legs into the deep leg veins, which is then pumped back to the heart. If these valves don’t work properly, blood can flow backwards in the veins and pool in the legs. These can result in a variety of symptoms. Some are mild (legs feeling heavy, aching and/or unsightly veins) to more severe (swelling, changes in skin colour, skin rashes, infections and chronic ulcers). People with more severe symptoms are said to suffer from chronic venous insufficiency (CVI). It has been reported that, in Thailand, varicose veins are common among women factory workers (33%). A study has confirmed that over 70% of hospitalized leg and foot ulcer patients were due to CVD. In addition, investigations by groups of Thai vascular (vein) specialists looking at different clinical presentations (signs and symptoms) and patterns of Thai patients with CVI, concluded that it can happen in young people. The progression of CVI can be prevented if diagnosed early. Bandaging is the most common method of managing the condition. However, many patients don’t stick to the treatment as its inconvenient and costly long term. Drug therapies could be an alternative, but searching through electronic databases brought up limited options that were mostly herbal medicines and the evidence that was available was conflicting. The active herbal extracts asiaticoside (from titrated extract centenella asiatica), acetyl salicylic acid (from willow bark extract) and acemannan (from aloe vera) were identified and selected based primarily on their combined potential anti-inflammatory, anti-fibrosis and anti-coagulating (stopping blood clots from forming), antibacterial and immunomodulation (modifying the immune system) effects. This study is investigating whether these medicines are an effective treatment for CVI.

Who can participate?
Patients diagnosed with CVI suffering with leg symptoms.

What does the study involve?
Participants are randomly allocated into one of two groups. Those in group 1 are given a herbal medicine combination gel formulation containing acetyl salicylic acid, asiaticoside and acemannan to use once in the morning and once in the evening continually for 3 months. Those in group 2 were given a placebo (dummy) gel to be applied in the same way as the herbal one for 3 months. Each patient’s CVI is assessed before the start of treatment, and then after week 1, week 2, week 3, week 4, week 8 and week 12.

What are the possible benefits and risks of participating?
The treatment may alleviate symptoms and help prevent the progression of CVI. The herbal medicine gels are safe to use, the only risks being a localized skin reaction similar to that of what may occur when using the placebo gel.

Where is the study run from?
Wiang Chai Somdej Prayanna Sangworn Hospital (Thailand)

When is the study starting and how long is it expected to run for?
February 2016 to December 2016

Who is funding the study?
National Research University Project, Chulalongkorn University (Thailand)

Who is the main contact?
Mr Anan Udombhornprabha

Trial website

Contact information



Primary contact

Mr Anan Udombhornprabha


Contact details

Eastern Asia University School of Pharmacy
200 Rangsit-Nakon Nayok (Klong 5) Road

Additional identifiers

EudraCT number number

Protocol/serial number

CR0032.115 Date 10 November 2015 #4400 EC_Chiangrai_Wiang Chai SDPY Hospital

Study information

Scientific title

Herbal medicine combination containing acetyl salicylic acid and asiaticoside plus acemannan in topical gel formulation for chronic venous insufficiency: a 3 month double-blind randomized placebo-controlled trial among Thai patients diagnosed as mild-to-moderate chronic venous insufficiency



Study hypothesis

Is the response to treatment of mild-to-moderate chronic venous insufficiency with a herbal medicine combination topical application containing 2% acetyl salicylic acid, 2% Asiaticoside plus 1% acemannan 50% better when compared to a placebo.

Ethics approval

College of Public Health Science, Chulalongkorn University, 10/11/2015, ref: CR0032.115

Study design

Interventional, prospective randomized, double-blind, placebo-controlled trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use contact details to request a participant information sheet


Chronic venous insufficiency


Participants fulfilling the eligibility criteria were randomly allocated into one of two arms.
1. Active treatment arm: each participant was given a herbal medicine combination gel formulation containing 2% acetyl salicylic acid in bees wax encapsulation and 2% asiaticoside plus 1% acemannan. It was applied to the leg with symptoms once in the morning and then again at bedtime continuously for 3 months.
2. Control treatment arm: each participant was given a placebo-gel with identical odour and colour with no active herbal drugs. It was applied to the leg with symptoms once in the morning and then again at bedtime continuously for 3 months.

Intervention type



Drug names

Primary outcome measures

Venous disease severity, assessed by the venous clinical severity score (VCSS) measured at baseline, week 1, week 2, week 3, week 4, week 8 and week 12

Secondary outcome measures

1. Disability caused by venous disease, assessed by the Venous Disease Disability Score (VDDS), measured at baseline, week 1, week 2, week 3, week 4, week 8 and week 12
2. Quality of life, assessed by the Chronic Venous Insufficiency Quality of Life Scale International Collaboration 14 questionnaires ( CIVIQ-14) and the Health-related Quality of Life Score Assessed with a Short-form 12-item Health Related Questionnaire Self-Administered Survey (SF-12). Measured at baseline and week 12
4. Assessment of overall physical functions, measured at baseline, week 1, week 2, week 3, week 4, week 8 and week 12
5. Laboratory blood chemistry and alanine aminotransferase enzyme assessments, measured at baseline, week 1, week 2, week 3, week 4, week 8 and week 12
6. Symptoms reported by patients, assessed by the Patients Self-Rated Symptoms Scale (VAS) in a weekly diary report

Overall trial start date


Overall trial end date


Reason abandoned


Participant inclusion criteria

Patients seeking advice at the surgery ambulatory clinics with at least 5 of the following symptoms:
1. Heavy leg
2. Pain in the leg
3. Sensation of leg swelling
4. Night cramp
5. Itching leg
6. Sensation of burning
7. Sensation of pins/needle in the leg
8. Presence of superficial varicose vein
9. Presence of spider veins 10. Presence of blood-clotting.

Plus these patients must have at least one risk factor as follows :
1. Sibling history with presence of swollen leg, spider & varicose veins and ankle/leg ulcer
2. Long hours standing per day (≥3 hours)
3. Long hours sitting per day (≥3 hours)
4. No regular exercise
5. Smoker
6. Taking hormone replacement therapy and/or contraceptive (oral/injectable)

And must have been accurately diagnosed as chronic venous insufficiency by physician as per WHO- ICD10 Criteria and also being graded as appropriate staging of the chronic venous insufficiency stage as per the CEAP Criteria.

Participant type


Age group




Target number of participants


Participant exclusion criteria

Patients with known history of:
1. ASA-exacerbated respiratory disease (AERD) and/or asthma
2. ASA-sensitivity and Rhinitis/Nasal Polyps
3. ASA and NSAIDs induce cutaneous reactions with Urticaria, Angioedema
4. ASA-induced anaphylactoid reactions with Hypotension, swelling, laryngeal edema, generalized pruritus, tachypnea
5. Patients with known sensitivity or allergic to centenella asiaticosa or asiaticoside.
6. Patients with known sensitivity or allergic to acemannan and the aloe vera products

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Wiang Chai Somdej Prayanna Sangworn Hospital, Chiang Rai
263 Tumbol Wiang Chai Amphoe Wiang Chai
Chiang Rai

Sponsor information


National Research University Project, Office of the Higher Education Commission (WCU-58-034-AS)

Sponsor details

Ministry of Education
c/o 254 Chulalongkorn University
Phyathai Road

Sponsor type




Funder type

Not defined

Funder name

National Research University Project, Chulalongkorn University

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

1. The baseline reports shall be published during June -July 2016
2. Results will be published after completion of the trial during Sept -Oct 2016
3. Publisher to be decided later

Intention to publish date


Participant level data

Not provided at time of registration

Results - basic reporting

Publication summary

Publication citations

Additional files

Editorial Notes