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CompletedNCT02191163Updated Jul 16, 2014

Efficacy of Antistax® in Improving Microcirculation of the Skin in the Leg in Patients Suffering From Chronic Venous Insufficiency

A Phase 2 interventional study of Antistax® and Placebo in Venous Insufficiency, sponsored by Boehringer Ingelheim. Completed. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2014-07-16.

Sponsored by Boehringer Ingelheim · Phase 2, Interventional, and Treatment

Phase
Phase 2
Study type
Interventional
Enrollment
71
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

Study to determine the efficacy and safety of Antistax® film coated tablets in improving microcirculation of the skin in the leg of patients with chronic venous insufficiency (CVI)

02

Conditions studied

  • Venous Insufficiency

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03

In context

Venous Insufficiency

189 studies on the registry are indexed under Venous Insufficiency; 16 are open to participants now.

This study's enrollment of 71 is above the median of 60 across 139 interventional studies indexed under Venous Insufficiency.

Browse Venous Insufficiency studies →

Lead sponsor

Boehringer Ingelheim is the lead sponsor of 2,245 studies on the registry; 58 are open to participants now.

Of its 162 completed or terminated interventional studies of FDA-regulated products, 116 (72%) have results posted.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Male or female
  • >= 18 years of age
  • CVI I or CVI II (without expanded trophic disturbances)
  • Willing and able to give written informed consent in accordance to Good Clinical Practice and local legislation prior to participation in the study

Exclusion criteria

Exclusion Criteria:

Concomitant disease(s) exclusion criteria:

  • Decompensated cardiac insufficiency
  • Edema not due to venous disease of the legs (e.g. latent cardiac insufficiency, renal insufficiency, lymph edema, etc)
  • Peripheral arterial disease (ankle/arm pressure index \< 0.9)
  • Current acute phlebitis or thrombosis
  • Renal insufficiency (Serum creatinine > 1.5 mg/dl)
  • Liver disease (SGPT (ALAT) > 3x upper limit of normal)
  • Other diseases: insulin-dependent diabetes mellitus, neuropathies, hyper- or hypocalcaemia, malignancies
  • Anamnestic indications of diabetic microangiopathy or polyneuropathy
  • Drug and/or alcohol abuse
  • Pregnant or nursing women or inadequate birth control methods (this applies to females of childbearing potential only)
  • Severe climacteric complaints or changes in, or initiation with post-menopausal hormone replacement therapy within the last 3 months
  • Immobility
  • Avalvulie
  • Klippel-Trénaunay-Weber-Syndrome (Naevus varicosis osteohypertrophicus, Haemangiectasia hypertrophicans)
  • State after pulmonary embolism
  • Recognized hypersensitivity to the trial drug ingredients
  • Current florid venous ulcus
  • Clinical indication for a necessary, specific phlebologic acute treatment, e.g. compressive treatment, phlebectomy, etc.

Previous treatment(s) exclusion criteria:

  • Treatment with venous drugs within the last 4 weeks
  • Changes in, or initiation with, treatment with theophylline, diuretics, cardiac glycosides, ACE inhibitors or calcium antagonists within the last 8 days

Concomitant treatment/non-drug therapy exclusion criteria:

  • Other venous drugs apart from the trial medication
  • Compression bandages
  • Venous surgery of the leg used for the fluxmetry
  • Extensive use (i.e. on more than a total of 6 days during the entire trial) of laxatives which affect fluid or electrolyte balance
  • Major surgery requiring full anesthesia

Other exclusion criteria:

  • Previously studied under this protocol
  • Participation in another clinical trial within the previous 90 days or during the present study
  • Patients considered as mentally ill as well as unable to work or with limited working ability, or unable (or only partially able) to follow the spoken or written explanations concerning the trial
  • Patients in a bad general health state according to the investigator's judgment
05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Crossover assignment
Masking
Double
Enrollment
71 participants (actual)

Study arms

  • Experimental
    Antistax®

    1 x 360 mg for 42 days

    Drug: Antistax®

  • Placebo comparator
    Placebo

    Drug: Placebo

Interventions

  • DrugAntistax®
  • DrugPlacebo
06

What researchers measure

Primary outcomes

  1. Changes from baseline in the resting flux

    measured in the frequency range 10-37 kHz on the skin of the inside lower leg using the Laser Doppler Fluxmetry

    Time frame: Baseline, after 6 weeks of treatment

Secondary outcomes

  1. Changes from baseline in the resting flux

    measured in the frequency range 10-37 kHz

    Time frame: Baseline, after 3 weeks of treatment

  2. Changes in the resting flux

    measured in the frequency range \<10 kHz

    Time frame: Baseline, after 3 and 6 weeks of treatment

  3. Changes in the combined resting fluxes (<37 kHz)

    Time frame: Baseline, after 3 and 6 weeks of treatment

  4. Changes in the transcutaneous oximetry (TcPO2)

    measured on the inside lower leg of the more CVI-affected leg

    Time frame: Baseline, after 3 and 6 weeks of treatment

  5. Change from baseline in the calf circumference of the most affected leg

    Time frame: Baseline, after 3 and 6 weeks of treatment

  6. Change from baseline in the ankle circumference of the most affected leg

    Time frame: Baseline, after 3 and 6 weeks of treatment

  7. Change from baseline in the subjective symptoms of CVI measured by Visual Analogue Scales (VAS)

    Time frame: Baseline, after 3 and 6 weeks of treatment

  8. Global efficacy assessment by patient on a 4-point verbal rating scale (VRS)

    Time frame: after 6 weeks of treatment

  9. Global efficacy assessment by investigator on a 4-point VRS

    Time frame: after 6 weeks of treatment

  10. Number of patients with adverse events

    Time frame: up to 16 weeks

  11. Number of patients with clinically relevant changes in laboratory values

    Time frame: Baseline, up to 16 weeks

  12. Number of patients with clinically significant changes in vital signs

    Time frame: Baseline, up to 16 weeks

  13. Global tolerability assessment by investigator on a 4-point VRS

    Time frame: after 6 weeks of treatment

  14. Global tolerability assessment by patient on a 4-point VRS

    Time frame: after 6 weeks of treatment

07

Study locations

No study locations are listed for this record.

08

References and documents

Publications

  • Martinez-Zapata MJ, Vernooij RW, Simancas-Racines D, Uriona Tuma SM, Stein AT, Moreno Carriles RMM, Vargas E, Bonfill Cosp X. Phlebotonics for venous insufficiency. Cochrane Database Syst Rev. 2020 Nov 3;11(11):CD003229. doi: 10.1002/14651858.CD003229.pub4. PubMed 33141449 ↗
09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 16, 2014, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT02191163
Lead sponsor
Boehringer Ingelheim
Responsible party
Sponsor
First posted
Jul 16, 2014
Start date
Apr 2002
Primary completion
Aug 2002
Last update
Jul 16, 2014
View the source record on ClinicalTrials.gov ↗

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