Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
NIASPAN vs TRICOR (MICRONIZED)
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Niacin (nicotinic acid) reduces hepatic production of VLDL and LDL, and increases HDL by inhibiting diacylglycerol acyltransferase-2 (DGAT2) and reducing hepatic triglyceride synthesis. It also decreases the catabolism of HDL apolipoproteins A-I and A-II.
Tricor (micronized fenofibrate) is a peroxisome proliferator-activated receptor alpha (PPARα) agonist that increases lipolysis and elimination of triglyceride-rich particles from plasma by activating lipoprotein lipase and reducing production of apolipoprotein C-III.
Primary dyslipidemia and mixed dyslipidemia as an adjunct to diet,Hypertriglyceridemia in patients at risk of pancreatitis,Reduction of risk of myocardial infarction in patients with hyperlipidemia and history of MI,Secondary prevention of cardiovascular events in combination with statin,Off-label: Prevention of pellagra (niacin deficiency)
Adjunctive therapy to diet for adult patients with primary hypercholesterolemia or mixed dyslipidemia (Fredrickson types IIa and IIb),Adjunctive therapy to diet for adult patients with severe hypertriglyceridemia (Fredrickson types IV and V),Fenofibrate is indicated as an adjunct to diet to reduce elevated LDL-C, total-C, triglycerides, and Apo B, and to increase HDL-C in patients with primary hypercholesterolemia or mixed dyslipidemia,Reduction of triglycerides in patients with hypertriglyceridemia (types IV and V hyperlipidemia)
Starting dose: 500 mg orally once daily at bedtime; after 4 weeks, increase to 1000 mg once daily; then titrate to maintenance dose of 1500-2000 mg once daily; maximum dose: 2000 mg/day.
Initial 48 mg (1 tablet) orally once daily with meals. May increase to 96 mg (2 tablets) once daily with meals. Maximum dose 96 mg/day.
Terminal half-life is 20-45 minutes (immediate-release) but due to prolonged release formulation of Niaspan, the half-life is extended to 2-4 hours for total nicotinic acid and 12 hours for nicotinuric acid, allowing once-daily dosing.
Terminal elimination half-life is approximately 20 hours (range 15-25 hours) in patients with normal renal function. Half-life is prolonged in renal impairment, requiring dose adjustment when e GFR < 30 m L/min/1.73 m².
Primarily hepatic metabolism via two pathways: conjugation with glycine to form nicotinuric acid (major pathway, saturable) and conversion to nicotinamide adenine dinucleotide (NAD). Minor metabolism via oxidation to N-methylnicotinamide and other metabolites.
Fenofibrate is a prodrug that is rapidly hydrolyzed by esterases to the active metabolite, fenofibric acid. Fenofibric acid is further metabolized by glucuronidation and excreted in urine. Major metabolic pathways involve hepatic glucuronidation via UGT1A1 and UGT1A3, with minor CYP-mediated metabolism (CYP3A4, CYP2C9).
Primarily renal (60-76% as unchanged drug and metabolites). Hepatic metabolism is extensive; less than 2% excreted in feces.
Primarily renal excretion of glucuronide conjugate, accounting for approximately 60-70% of elimination; fecal excretion accounts for about 25%. Minimal unchanged drug in urine.
<20% bound to plasma proteins (mainly albumin). Binding is negligible at therapeutic concentrations.
Highly protein-bound (>99%), primarily to albumin.
Approximately 0.5 L/kg (around 35 L in a 70 kg adult), indicating distribution into total body water.
Apparent volume of distribution is approximately 0.5 L/kg (range 0.2-0.9 L/kg). This moderate Vd indicates limited extravascular distribution, primarily intravascular and interstitial fluid spaces.
Oral (extended-release): ~60-76% due to extensive first-pass metabolism. Bioavailability is dose-dependent and saturable at higher doses.
Oral bioavailability is approximately 66% (range 50-90%) after administration of micronized fenofibrate capsules taken with food. Absorption is enhanced by food; bioavailability is reduced when taken on an empty stomach.
No specific dose adjustment provided by manufacturer; use with caution in patients with renal impairment; avoid in patients with severe renal impairment or nephrotic syndrome.
Contraindicated in severe renal impairment (e GFR <30 m L/min/1.73 m²). For mild to moderate impairment (e GFR 30-80 m L/min/1.73 m²), reduce dose to 48 mg once daily. Not to exceed 48 mg/day.
Contraindicated in patients with significant or unexplained hepatic dysfunction; use with caution in patients with Child-Pugh class A, avoid in Child-Pugh class B or C.
Contraindicated in active liver disease or unexplained persistent liver function abnormalities. For Child-Pugh class A or B, avoid use due to potential risk; no specific dose adjustment recommendations, but cautious use only if benefit outweighs risk. Contraindicated in Child-Pugh class C.
Safety and efficacy not established in pediatric patients; not recommended for use.
Safety and effectiveness in pediatric patients have not been established; use not recommended in children.
No specific dose adjustment recommended; monitor for adverse effects such as myopathy and hepatotoxicity; initiate at low end of dosing range.
Select dose cautiously starting at the lower end of dosing range (48 mg once daily) due to possible decreased renal function and increased risk of adverse effects. Monitor renal function and adjust accordingly.
No FDA black box warning.
There is no FDA black box warning for Tricor (micronized fenofibrate).
Hepatotoxicity: elevated liver enzymes, rare severe hepatotoxicity; avoid in patients with active liver disease,Flushing: prostaglandin-mediated, can be reduced by taking aspirin or starting with low doses,Hyperglycemia: may increase blood glucose, use with caution in diabetic patients,Hyperuricemia: may precipitate gout, monitor uric acid,Gastrointestinal effects: can cause peptic ulcer, use caution with history of GI bleeding,Cardiovascular: may cause hypotension, especially with concurrent use of antihypertensives
Hepatotoxicity: elevations of serum transaminases; monitor liver function tests,Cholelithiasis: fenofibrate may increase cholesterol excretion into bile, leading to gallstones,Pancreatitis: risk may be increased, especially in patients with severe hypertriglyceridemia,Myopathy/rhabdomyolysis: risk increased when used with HMG-Co A reductase inhibitors (statins) or other fibrates,Renal impairment: dose adjustment required; contraindicated in severe renal impairment (e GFR <30 m L/min/1.73 m²)
Active liver disease or unexplained transaminase elevations,Active peptic ulcer disease,Arterial bleeding,Hypersensitivity to niacin or any component of the formulation
Severe renal impairment (e GFR <30 m L/min/1.73 m²) or end-stage renal disease,Active liver disease, including primary biliary cirrhosis and unexplained persistent liver function abnormalities,Pre-existing gallbladder disease,Known hypersensitivity to fenofibrate or any component of the formulation,Breastfeeding (due to potential for serious adverse reactions in nursing infants)
Avoid alcohol, hot beverages, and spicy foods near dose time as they can worsen flushing. Take with a low-fat snack (e.g., apple, rice cakes) to reduce gastrointestinal upset and flushing. Avoid high-fat meals which may increase risk of flushing. Grapefruit juice has no significant interaction but other fruit juices have not been studied; advise moderate intake.
Take with food to enhance absorption. Avoid grapefruit juice. Limit alcohol intake. Maintain a low-fat diet as part of triglyceride management.
Niacin (NIASPAN) is classified as FDA Pregnancy Category C. Animal studies have shown adverse effects at high doses, but there are no adequate and well-controlled studies in pregnant women. Niacin should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. There is no evidence of teratogenicity in humans at recommended doses, but high doses may cause fetal harm.
FDA Pregnancy Category C. First trimester: No adequate human studies; animal studies show fetal skeletal variations at high doses. Second and third trimesters: Avoid due to potential fetal harm and insufficient data. Use only if benefit outweighs risk.
Niacin is excreted in human breast milk in amounts that are likely comparable to maternal plasma levels. The milk-to-plasma (M/P) ratio for niacin is approximately 1.0. The American Academy of Pediatrics considers niacin compatible with breastfeeding at usual dietary intakes, but high pharmacological doses should be avoided due to potential adverse effects in the infant, such as flushing and gastrointestinal disturbances.
No data on milk concentration or M/P ratio. Not recommended due to potential for adverse effects in nursing infant; alternatives should be considered.
No specific dose adjustments are recommended for niacin during pregnancy due to lack of data on pharmacokinetic changes. However, doses should be kept at the lowest effective level and used only when clearly needed. There is no evidence that pregnancy alters niacin clearance or requires dose modification.
No established dosing adjustments. Pharmacokinetics may be altered due to increased plasma volume and renal clearance; monitor efficacy and safety. Consider therapy discontinuation.
Niacin extended-release (NIASPAN) causes flushing, which can be mitigated by taking aspirin 30 minutes before dosing, avoiding alcohol and hot beverages at time of dosing, and initiating at low dose with gradual titration. Liver function tests must be monitored; elevation >3x ULN requires discontinuation. NIASPAN can exacerbate gout by increasing uric acid levels; check uric acid at baseline and periodically. Use with caution in diabetes as it may increase glucose levels. Avoid in patients with active liver disease, unexplained transaminase elevations, or peptic ulcer disease.
Monitor renal function before and during therapy; reduce dose in e GFR 30-59 m L/min; contraindicated in severe renal impairment (e GFR <30 m L/min). May increase serum creatinine and transaminases. Avoid in active liver disease or unexplained persistent transaminase elevation. Risk of myopathy increases when coadministered with statins, especially in renal impairment. Can be used in combination with statins but monitor for muscle symptoms. Dose adjustment not required in mild to moderate hepatic impairment but use with caution.
Take NIASPAN at bedtime with a low-fat snack to reduce flushing.,Do not take on an empty stomach; avoid alcohol and hot drinks near dose time.,Flushing may occur but usually decreases over weeks; can take aspirin 30 minutes prior to dose.,Do not miss doses; if a dose is missed, do not double up the next day.,Common side effects include flushing, itching, and tingling; report severe or persistent effects.,Your doctor will monitor blood glucose, uric acid, and liver function regularly.,Do not substitute with other niacin preparations without doctor approval.
Take with food to improve absorption and reduce GI side effects.,Swallow capsules whole; do not crush, chew, or open.,Avoid consuming grapefruit juice as it may increase drug levels.,Report unexplained muscle pain, tenderness, or weakness, especially if accompanied by fever or malaise.,May cause gallstones; report right upper abdominal pain, nausea, or vomiting.,Avoid alcohol as it may increase triglyceride levels and liver effects.,This medication is not a substitute for a healthy diet and exercise; continue lifestyle modifications.,Inform your doctor if you have kidney or liver disease, diabetes, or if you are pregnant or breastfeeding.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about NIASPAN vs TRICOR (MICRONIZED), answered by our medical review team.
NIASPAN is a Antilipemic agent that works by Niacin (nicotinic acid) reduces hepatic production of VLDL and LDL, and increases HDL by inhibiting diacylglycerol acyltransferase-2 (DGAT2) and reducing hepatic triglyceride synthesis. It also decreases the catabolism of HDL apolipoproteins A-I and A-II.. TRICOR (MICRONIZED) is a Fibrate Antilipemic that works by Tricor (micronized fenofibrate) is a peroxisome proliferator-activated receptor alpha (PPARα) agonist that increases lipolysis and elimination of triglyceride-rich particles from plasma by activating lipoprotein lipase and reducing production of apolipoprotein C-III.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between NIASPAN and TRICOR (MICRONIZED) depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of NIASPAN is: Starting dose: 500 mg orally once daily at bedtime; after 4 weeks, increase to 1000 mg once daily; then titrate to maintenance dose of 1500-2000 mg once daily; maximum dose: 2000 mg/day.. The standard adult dose of TRICOR (MICRONIZED) is: Initial 48 mg (1 tablet) orally once daily with meals. May increase to 96 mg (2 tablets) once daily with meals. Maximum dose 96 mg/day.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between NIASPAN and TRICOR (MICRONIZED) in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. NIASPAN is classified as Category C. Niacin (NIASPAN) is classified as FDA Pregnancy Category C. Animal studies have shown adverse effects at high doses, but there are no adequate and well-controlled studies in pregna. TRICOR (MICRONIZED) is classified as Category C. FDA Pregnancy Category C. First trimester: No adequate human studies; animal studies show fetal skeletal variations at high doses. Second and third trimesters: Avoid due to potenti. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.