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In page Nicotinic acid:

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Prescription nicotinic acid, commonly labeled as niacin in the United States, is available in immediate-release and slow-release formulations. It is used to treat primary hyperlipidemia and hypertriglyceridemia.[1][2] It is used either as a monotherapy or in combination with other lipid-modifying drugs. Dosages start at 500 mg/day and are often gradually increased to as high as 3000 mg/day for immediate release or 2000 mg/day for slow release (also referred to as sustained release) to achieve the targeted lipid changes (lower LDL-C and triglycerides, and higher HDL-C).[1][2] Prescriptions in the US peaked in 2009, at 9.4 million[citation needed] and had declined to 800 thousand by 2020.[3]