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Updated: May 6, 2026

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Simvastatin lowers C-reactive protein within 14 days: an effect independent of low-density lipoprotein cholesterol
Julie K Plenge1, Teri L Hernandez, Kathleen M Weil
1Division of Endocrinology, Metabolism, and Diabetes, University of Colorado Health Sciences Center, Denver, Colo 80262, USA.
Background:
The early response of C-reactive protein to initiation of a hydroxymethylglutaryl coenzyme A reductase inhibitor (statin) is not known. The purpose of this study was to determine the rate at which highly sensitive C-reactive protein (hsCRP) levels change after initiation of simvastatin and whether this occurs independently of the change in LDL cholesterol.
Methods And Results:
The study was a crossover, double-blind design including 40 subjects with elevated LDL cholesterol. Subjects were randomly assigned to 1 of 2 groups: simvastatin 40 mg for 14 days, then placebo for 14 days, or placebo first, then simvastatin. Simvastatin decreased LDL cholesterol by 56+/-4 mg/dL (P<0.0001) at day 7 and by an additional 8+/-3 mg/dL (P=0.02) at day 14. Baseline log(hsCRP) levels were similar in the 2 groups. By day 14, log(hsCRP) was significantly lower in patients on simvastatin when compared with placebo (P=0.011). Although there was no significant difference in fibrinogen levels, simvastatin produced a modest increase in log[lipoprotein(a)] (P=0.03) at days 7 and 14. There were no relationships between the decrease in LDL cholesterol and the decrease in hsCRP.
Conclusions:
Simvastatin lowers hsCRP by 14 days, independent of its effect on LDL cholesterol. This rapid impact of a statin on hsCRP has potential implications in the management of acute coronary syndromes.
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