SLIM: Combined Effects of Slo-Niacin and Atorvastatin on Lipoproteins and Inflammatory Markers in Hyperlipidemia


Slo-Niacin and atorvastatin (Lipitor) are both drugs that lower cholesterol. In this research, we will compare the effectiveness of Slo-Niacin and atorvastatin taken alone and together. This study will help show how the individual benefits of the two drugs taken separately can be combined when taken together.

Full Title of Study: “SLIM: Combined Effects of Slo-Niacin and Atorvastatin on Lipoproteins and Inflammatory Markers”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Treatment
    • Masking: None (Open Label)
  • Study Primary Completion Date: January 2006

Detailed Description

Combined niacin and a statin treatment has greater potential value than either agent alone for the dyslipidemia of insulin resistance, obesity and the metabolic syndrome. The efficacy of Slo-Niacin and atorvastatin has not been formally examined in this setting. Methods: Forty-four dyslipidemic men and women (LDL-C >130mg/dL and below average HDL-C (<55 in women and <45 in men) were randomized to a 3 month course of atorvastatin 10 mg or Slo-Niacin increased monthly at doses of 500, 1000 and 1500 mg/day. The alternate drug was added in the second 3-month segment. Lipid profiles and transaminase measurements were obtained monthly and full lipoprotein quantifications, apoproteins, remnant like lipoproteins (RLP), LDL buoyancy, glucose, insulin, and C-reactive protein were measured at the end of each 3-month sequence. Results: Mean entry lipids were (mg/dL) TG 187, LDL-C 171, HDL-C 39. Mean BMI was 32.6 Kg/M2. When Slo-Niacin and atorvastatin were given alone, respective decreases in triglyceride (TG) were 18% and 10%, LDL-C 12% and 36% and non-HDL-C 15% and 36%. HDL-C increased 8% and 6%, respectively. Combined therapy decreased median TG 33% and mean LDL-C 43% and increased mean HDL-C 10%. Mean hs CRP decreased 23% and RLP 44.5% in the combined groups. Conclusions: Slo-Niacin with atorvastatin improves all lipoprotein fractions, RLP and hsCRP in combined hyperlipidemia. The reduction of LDL with the drug combination is equivalent to that obtained with 20-80 mg of atorvastatin alone.


  • Drug: Slo-Niacin, atorvastatin
    • Atorvastatin 10 mg qd for 12 or 24 weeks. Time-released niacin 1500 mg qd (titrated from 500mg to 1000mg and then to 1500 mg at 4 week intervals) taken for 12 or 24 weeks.

Arms, Groups and Cohorts

  • Active Comparator: 1
    • Atorvastatin 10 mg for 12 weeks followed by Slo-Niacin (titrated from 500 to 1500 mg over 8 weeks) taken with atorvastatin 10 mg for an additional 12 weeks
  • Active Comparator: 2
    • Slo-Niacin (titrated from 500 to 1500 mg over 8 weeks) for 12 weeks followed by atorvastatin 10 mg taken with Slo-Niacin 1500 mg for an additional 12 weeks

Clinical Trial Outcome Measures

Primary Measures

  • LDL-C change for atorvastatin 10 mg, Slo-Niacin 1500 mg, and the two together.
    • Time Frame: Change from baseline to 12 weeks and end of intervention

Secondary Measures

  • Change in HDL-C, HDL2-C, HDL3-C, LDL-C:HDL-C, triglyceride, remnant lipoprotein, apoproteins A-I and B, LDL buoyancy, hsCRP, glucose, insulin, and SGOT.
    • Time Frame: Change from baseline to end of 12 weeks and/or end of intervention

Participating in This Clinical Trial

Inclusion Criteria

  • LDL-C > 130 mg/dL – HDL-C <= 45 mg/dL in men and <= 55 mg/dL in women Exclusion Criteria:

  • history of hypersensitivity to any statin, niacin or aspirin – diagnosis of diabetes or a fasting glucose > 125 mg/dL – hyper or hypothyroidism (unless treatment stable) – meet other health, medication, and logistical criteria

Gender Eligibility: All

Minimum Age: 21 Years

Maximum Age: 75 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • University of Washington
  • Collaborator
    • Upsher-Smith Laboratories
  • Provider of Information About this Clinical Study
    • Robert H. Knopp, MD, Professor of Medicine, University of Washington
  • Overall Official(s)
    • Robert H. Knopp, MD, Principal Investigator, Northwest Lipid Research Clinic, University of Washington

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