Efficacy and Safety of Coumarin and Troxerutin in the Symptomatic Treatment of Chronic Venous Insufficiency

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the efficacy and safety of the fixed-dose combination of coumarin and troxerutin versus placebo in the symptomatic treatment of chronic venous insufficiency.

Detailed Description
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The drug being tested in this study is the fixed-dose combination of coumarin and troxerutin called Venalot®. Venalot is being tested to treat the symptoms of chronic venous insufficiency. This study will look at symptom relief in people who take Venalot®. The study will enroll approximately 808 patients. Participants will be randomly assigned (by chance, like flipping a coin) to one of the two treatment groups-which will remain undisclosed to the patient and study doctor during the study (unless there is an urgent medical need): Combination coumarin + troxerutin extended release tablets Placebo (dummy inactive pill) - this is a tablet that looks like the study drug but has no active ingredient. All participants will be asked to take two tablets three times a day throughout the study. This multi-centre trial will be conducted in Brazil. The overall time to participate in this study is up to 18 weeks. Participants will make 6 visits to the clinic.

Official Title
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Evaluation of Efficacy and Safety of the Fixed-dose Combination of Coumarin and Troxerutin (Venalot®) Versus Placebo in the Symptomatic Treatment of Chronic Venous Insufficiency - VENACT

Conditions
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Chronic Venous Insufficiency

Intervention / Treatment
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* Drug: Coumarin/troxerutin
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Consent of subject or legal representative Men or women of any ethnicity, aged between 18 and 75 years, and body mass index (BMI) equal or less than 40. Is able to use properly the medication according to protocol. Has chronic venous insufficiency in the reference leg with the clinical classification C3, or C4a orC4b or C5, provided that in two last situations the present lipodermatosclerosis does not compromise more than 1/3 portion of the leg immersed or immersible in the plethysmometer. Has stable edema (in a steady state), equivalent to a variation lower than or equal to 10% in partial volume of the reference leg between the screening visit and the randomization visit, and present for at least 6 months. Scoring in Severity Score of Local Complaints equal to or higher than 5 total points. Women who are using an effective (at the discretion of the investigator), but not hormonal, birth control method (not hormonal intrauterine device (IUD), surgical sterilization, among others), or who are postmenopausal, in addition to condom use (mandatory). Exclusion Criteria: Has chronic venous insufficiency classified as C1, C2 in the reference leg or C6 in any leg. Has chronic venous insufficiency C4b or C5 in the reference leg, with lipodermatosclerosis present in more than 1/3 portion of the leg immersed in the plethysmometer. Has unstable edema, equivalent to variation of more than 10% of partial volume in the reference leg between the screening visit and randomization visit, prior to start of treatment. Has venous obstruction and/or deep vein thrombosis (DVT) and/or presence of phlebitis in lower limbs during the last 3 (three) months. Has developed deep vein insufficiency during the last 3 (three) months. Has other diseases that may interfere in the findings of the study such as: lymphedema, thrombosis, clotting disorders, edema of lower limbs due to right-sided heart failure, arterial obstruction of lower limbs and other conditions that, at medical discretion, are relevant to exclusion, particularly symptoms which are similar to the symptomatology of chronic venous insufficiency. Has a history of surgery at the venous system or sclerotherapy or who received any treatment for chronic venous insufficiency during the last 03 months, whether it was by drug, elastic stocking, laser, or surgery. Has used previously Venalot® and had no benefits with the treatment. Has a previous history of known or suspected allergy or intolerance to any of the ingredients of the medicinal product under investigation. Has any clinical finding (history and physical examination) that is interpreted by the physician-investigator as a risk to participant's participation in the study. Has known serious systemic disease, according to the medical and/or laboratory history. Has history of a known liver disease such as hepatitis A, hepatitis B, or C. Has changed at least one lab parameters: aspartate aminotransferase (AST), alanine aminotransferase (ALT), gamma-glutamyltransferase (gamma-GT), or alkaline phosphatase 2.5 times above the upper limit of normal range; hemoglobin less than 10 g/dL; clearance of creatinine estimative equal or above 60mL/min/1.73 m^2; platelets below 90,000/mL; and total bilirubin and fractions 1.5 times above the normal values. Has been using diuretics for a period less than or equal to 6 months due to any disease (hypertension, renal failure, or other). Has serious chronic liver or kidney disease, according to the medical and/or laboratory history. Has uncontrolled blood hypertension (systolic blood pressure > 180 mmHg or diastolic blood pressure > 100 mmHg) at randomization or clinical hypertensive urgency. Has a previous history of diabetes mellitus on use of insulin. Has received treatment with immunosuppressive drugs, including systemic corticosteroids within 30 days before the start of study (randomization visit), or who are receiving immunosuppressive treatments, or who have known congenital or acquired immunodeficiency. Has malignant neoplasms, from any etiology, or who are receiving any type of anticancer treatment, unless when properly treated and with no evidence of recurrence during the last five years. Non-melanoma skin cancer is not an exclusion criterion. Is unable to understand the guidelines specified in this protocol or who cannot attend all the study visits. Has a previous history of alcoholism, drug abuse, psychological or emotional problems in the last 5 years that can invalidate the Informed Consent Form or restrain participant's ability to comply with the requirements of the protocol. Pregnant or breastfeeding women, or those who have the potential to become pregnant and are not using an appropriate contraceptive method. Women who are using hormonal contraceptives or hormone replacement treatment, including phytoestrogens, within the last 3 months. Took part in clinical trials during the last year.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Coumarin 30 mg + Troxerutin 180 mg<br>Coumarin 30 mg, troxerutin 180 mg fixed-dose combination tablets, orally, three times daily for up to 16 weeks. | Drug: Coumarin/troxerutin<br>* Coumarin + troxerutin fixed-dose combination tablets<br>* Other names: Venalot®;|
| Placebo Comparator: Placebo<br>Coumarin + troxerutin placebo-matching tablets, orally, three times daily for up to 16 weeks. | Drug: Placebo<br>* Coumarin + troxerutin placebo-matching tablets<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean Change (Reduction) From Baseline in Volume of Reference Leg at Week 16 | Change in the partial volume of legs will be measured using a water plethysmometer. The volume of water (at 34 ± 0.2 °C) displaced after limb immersion is collected in an empty plastic Beaker which has been previously weighed (scale tare). The equilibrium/stability will be estimated using the absolute difference between measures of volume obtained at the Week 16 visit and Baseline to determine the reduction in edema. | Baseline and Week 16 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Participants With Adverse Events (AEs) | Adverse events are any unwanted medical occurrences in an individual taking part in a clinical study who is receiving a pharmaceutical product. The adverse event does not have necessarily a causal relationship with the treatment. In this definition, any adverse or unwanted signals and symptoms, or findings that appear from the start or that deteriorate during the clinical study are also included, i.e. any intercurrent diseases (recently diagnosed concomitant diseases or symptoms), accidents and clinically relevant changes in clinical laboratory values. | Baseline to Week 16 | 
| Change (Reduction) From Baseline in Local Complaint Severity | Local Complaint Severity will be assessed using the Severity Score of Local Complaints that comprises 8 items: 1=tired legs, 2=heavy legs, 3= feeling of tension, 4=feeling of swelling, 5=aching legs, 6=tingling, 7=itching, 8=burning of soles of the feet. Each item is classified with a Likert-type scale of 5 levels, where 0=absent, 1=low, 2=medium, 3=high, 4=very high. A total score is calculated from the sum of the scores of all the 8 items and ranges from 0 (complaints absent) to 32 (very high severity). | Baseline and Week 16 | 
| Overall Assessment by the Investigator | The investigator recorded their impression of the overall clinical picture at the end of the treatment period (Week 16), taking into account the clinical picture compared with the Baseline visit. Data is reported for the percentage of participants in each of the following assessment categories: worsening, unchanged, discreet improvement or accentuated improvement. | Baseline and Week 16 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Drug therapy