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Prolonged-Release Nicotinic Acid

A Review of its Use in the Treatment of Dyslipidaemia

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Summary

Abstract

Prolonged-release (PR) nicotinic acid (niacin) [Niaspan®] is an oral, once-daily formulation of the lipid-modifying drug designed to produce less vasodilatory flushing than crystalline immediate-release (IR) nicotinic acid and less hepatotoxicity than previous sustained-release formulations of nicotinic acid.

PR nicotinic acid appears to retain the same level of efficacy as crystalline IR nicotinic acid and be better tolerated than older nicotinic acid formulations. Nicotinic acid has beneficial effects on all traditional blood lipid and lipoprotein fractions and is the most effective agent for increasing high-density lipoprotein (HDL)-cholesterol (HDL-C) and reducing lipoprotein(a). The effects of PR nicotinic acid are often additive when used in combination with HMG-CoA reductase inhibitors (statins), making it a useful addition when lipid goals are not achieved with the usual statin monotherapy or when additional correction of a specific lipid abnormality is required. PR nicotinic acid also slows atherosclerotic progression and even appears to produce regression of atherosclerosis in patients on stable statin therapy. PR nicotinic acid is a logical drug choice for treating atherogenic dyslipidaemia commonly associated with type 2 diabetes mellitus and the metabolic syndrome, and has been shown to be effective in patients with diabetes without adversely affecting glycaemic control in the majority of patients. The incidence of vasodilatory flushing with PR nicotinic acid is lower than with IR nicotinic acid and it decreases substantially over time as tolerance develops. To date, there has been no clinically significant hepatotoxicity observed with PR nicotinic acid. Therefore, once-daily PR nicotinic acid appears to maximise the potential benefits of nicotinic acid, while minimising any historical tolerability or safety concerns.

Pharmacological Properties

PR nicotinic acid appears to increase HDL-C levels by selectively blocking hepatic catabolic uptake of HDL particles containing apolipoprotein A-I and thereby augmenting reverse cholesterol transport. It selectively increases the proportion of larger HDL particles resulting in an overall increase in HDL particle size. The increase in HDL-C in patients with coronary artery disease was shown to correlate with improved endothelium-dependent vasodilation. PR nicotinic acid also reduces triglycerides and very low-density lipoprotein (VLDL) particles by decreasing the mobilisation of free fatty acids from peripheral adipose tissue to the liver. PR nicotinic acid decreases the number of low-density lipoprotein (LDL) particles and increases the mean LDL particle size.

Oral PR nicotinic acid is rapidly absorbed and undergoes extensive first-pass metabolism. The time to peak plasma concentration was 4–5 hours. Approximately 60–76% of the dose was recovered in the urine as unchanged nicotinic acid or metabolites. The ratio of non-conjugative to conjugative metabolites decreased with increasing dosage of PR nicotinic acid between 1000 (7.2) and 3000 (1.4) mg/day.

Therapeutic Efficacy

PR nicotinic acid beneficially altered all serum lipid components relative to placebo in patients with primary dyslipidaemia. The response was dose-proportional in the range 500–2000 mg/day. In two studies, PR nicotinic acid 2000 mg/ day increased HDL-C by 23% and 26% from baseline and decreased triglycerides by 29% and 35%, lipoprotein(a) by 24% and 27%, LDL-cholesterol (LDL-C) by 14% and 17%, apolipoprotein B by 16% and total cholesterol by 10% and 12%, respectively.

PR nicotinic acid maintained full efficacy for at least 2 years in open-label extension studies.

In a head-to-head comparison in patients with hyperlipidaemia, the efficacy of PR nicotinic acid was similar to that of IR nicotinic acid when administered at the same daily dosage (1500 mg/day). PR nicotinic acid 1500–2000 mg/day increased HDL-C and reduced lipoprotein(a) to a greater extent than did gemfibrozil 1200 mg/day in patients with low HDL-C, while gemfibrozil reduced triglycerides to a greater extent than did PR nicotinic acid. PR nicotinic acid tended to increase HDL-C more than lovastatin and to reduce lipoprotein(a) more than lovastatin or rosuvastatin in patients with hyperlipidaemia or mixed dyslipidaemia. Lovastatin and rosuvastatin each tended to reduce total cholesterol and LDL-C to a greater extent than PR nicotinic acid.

The combinations of PR nicotinic acid/lovastatin 1500mg/20mg and 2000mg/ 40mg produced generally additive responses. Combinations of PR nicotinic acid and rosuvastatin were generally superior to rosuvastatin alone only with respect to improvements in HDL-C, lipoprotein(a) or apolipoprotein A-I.

PR nicotinic acid in combination with a statin reduced the progression of carotid intima-media thickness compared with placebo, but the difference did not reach statistical significance. Atherosclerotic progression at 12 months in placebo recipients was statistically significant, while progression in recipients of PR nicotinic acid was not significant. Preliminary results from an open-label, 12-month extension study suggest that PR nicotinic acid added to a statin produces significant regression of atherosclerosis over 12–24 months.

PR nicotinic acid 1500 mg/day effectively increased HDL-C and decreased triglycerides and LDL-C in patients with dyslipidaemia and type 2 diabetes.

Tolerability

PR nicotinic acid is generally well tolerated with most adverse events being mild-to-moderate in intensity and transient in nature. Flushing was the most frequent adverse event, followed by gastrointestinal symptoms and other cutaneous reactions. PR nicotinic acid-induced flushing decreased over time and was associated with a low incidence of treatment discontinuation. The incidence of flushing with PR nicotinic acid was initially significantly lower than that with IR nicotinic acid.

PR nicotinic acid produced small, reversible elevations in liver transaminases, but there was no clinically significant hepatotoxicity. Similarly, elevated uric acid levels associated with recommended dosages of PR nicotinic acid did not result in any instances of clinical gout. PR nicotinic acid therapy in patients with type 2 diabetes and dyslipidaemia was associated with a small, but statistically significant, increase in glycosylated haemoglobin levels. However, fasting blood glucose levels were well controlled over the course of the 16-week study in most patients.

The incidence of adverse events and treatment discontinuation was higher with PR nicotinic acid than with lovastatin or rosuvastatin, predominantly as a result of flushing with PR nicotinic acid, while the overall tolerability of PR nicotinic acid was similar to that of gemfibrozil. No instances of myopathy or new adverse events occurred when PR nicotinic acid was given in combination with statins.

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Notes

  1. The use of trade names is for product identification purposes only and does not imply endorsement.

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Acknowledgements

At the request of the journal, Merck KGaA provided a non-binding review of this article.

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Correspondence to Paul L. McCormack.

Additional information

Various sections of the manuscript reviewed by: D.M. Capuzzi, Cardiovascular Disease Prevention Center, Jefferson Heart Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA; P.H. Chong, John H Stroger Jr Hospital of Cook County, Chicago, Illinois, USA; W. Insull Jr, Lipid Research Clinic, Baylor College of Medicine, Houston, Texas, USA; M.P. Kane, Department of Pharmacy Practice, Albany College of Pharmacy, Albany, New York, USA; R.A. Kreisberg, University of South Alabama, Mobile, Alabama, USA; J.M. McKenney, National Clinical Research Inc., Richmond, Virginia, USA; P.P. Toth, Sterling Rock Falls Clinic, Sterling, Illinois, USA.

Data Selection

Sources: Medical literature published in any language since 1980 on ‘niacin XR’, identified using MEDLINE and EMBASE, supplemented by AdisBase (a proprietary database of Adis International). Additional references were identified from the reference lists of published articles. Bibliographical information, including contributory unpublished data, was also requested from the company developing the drug.

Search strategy: MEDLINE, EMBASE and AdisBase search terms were (‘niacin’ or ‘nicotinic acid’) and (‘extended release’ or ‘controlled-release’ or ‘sustained-release’). Searches were last updated 30 November 2005.

Selection: Studies in patients with dyslipidaemia who received prolonged-release niacin. Inclusion of studies was based mainly on the methods section of the trials. When available, large, well controlled trials with appropriate statistical methodology were preferred. Relevant pharmacodynamic and pharmacokinetic data are also included.

Index terms: Nicotinic acid, lipid metabolism disorders, pharmacodynamics, pharmacokinetics, therapeutic use, tolerability.

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McCormack, P.L., Keating, G.M. Prolonged-Release Nicotinic Acid. Drugs 65, 2719–2740 (2005). https://doi.org/10.2165/00003495-200565180-00014

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