Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
NIACOR vs LIPIDIL
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 VLDL and LDL synthesis by inhibiting lipolysis in adipose tissue, decreasing free fatty acid flux to the liver, and inhibiting hepatic triglyceride synthesis. It also increases HDL by reducing catabolism of apolipoprotein A-I.
LIPIDIL (fenofibrate) is a fibric acid derivative that activates peroxisome proliferator-activated receptor-alpha (PPAR-alpha), leading to increased lipolysis and clearance of triglyceride-rich particles, and increased synthesis of apolipoproteins A-I and A-II.
Adjunct to diet for reduction of elevated total cholesterol, LDL-C, apo B, and triglyceride levels, and to increase HDL-C in primary hypercholesterolemia and mixed dyslipidemia,Adjunct to diet for reduction of risk of recurrent myocardial infarction in patients with coronary artery disease and hypercholesterolemia,Adjunct to diet for slowing progression of coronary atherosclerosis,Off-label: treatment of pellagra (niacin deficiency)
Primary hypercholesterolemia or mixed dyslipidemia (as adjunct to diet),Severe hypertriglyceridemia,Prevention of pancreatitis in patients with hypertriglyceridemia
Initial: 250 mg orally once daily after evening meal; titrate up by 250–500 mg/day every 2–4 weeks. Maintenance: 1–2 g/day in divided doses (2–3 times daily). Maximum: 6 g/day.
130 mg orally once daily.
20–45 minutes for immediate-release niacin; terminal half-life of main metabolites (nicotinuric acid) is approximately 1.5–4 hours; short half-life necessitates multiple daily dosing for lipid effects
Terminal elimination half-life of fenofibric acid is approximately 20 hours (range 15-25 hours). This supports once-daily dosing; steady-state is achieved after ~5 days.
Hepatic metabolism via two pathways: conjugation with glycine to form nicotinuric acid (major, low-affinity high-capacity) and oxidation to N-methylnicotinamide and other metabolites (minor, high-affinity low-capacity). Enzymes involved: nicotinamide N-methyltransferase (NNMT) and aldehyde oxidase.
Fenofibrate is metabolized primarily by glucuronidation; fenofibric acid is further metabolized via reduction to benzhydrol metabolite. Minor involvement of CYP450 enzymes, predominantly CYP3A4.
Renal: 60-88% as unchanged drug and metabolites after oral administration; fecal: <2%
Primarily renal excretion of glucuronide conjugates; approximately 70% of a single oral dose is recovered in urine (mostly as fenofibric acid glucuronide), and about 6% is excreted in feces.
<20% bound to albumin; minimal binding to other plasma proteins
Fenofibric acid is highly bound to plasma proteins, primarily albumin, with >99% binding.
0.5–0.7 L/kg; indicates distribution into total body water and some tissue binding
Apparent volume of distribution (Vd/F) is approximately 0.9 L/kg, indicating distribution into total body water.
Oral immediate-release: 60–76% (variable due to first-pass metabolism); sustained-release: lower bioavailability (50–60%) due to increased presystemic metabolism
Absolute bioavailability of fenofibrate (prodrug) is not determined; fenofibrate is rapidly converted to fenofibric acid with a relative bioavailability of approximately 81-96% compared to the micronized formulation when taken with food. Absorption is enhanced when taken with meals.
No specific adjustment recommended; use caution in severe renal impairment (Cr Cl <30 m L/min) due to potential accumulation; consider reducing dose or prolonging interval.
GFR 30-89 m L/min: 130 mg once daily; GFR <30 m L/min: contraindicated.
Contraindicated in Child-Pugh class B and C; use with caution in mild impairment (Child-Pugh A) with dose reduction of 50% initially.
Child-Pugh class A: 130 mg once daily; Child-Pugh class B or C: contraindicated.
For hyperlipidemia (off-label): Initial 50–100 mg/kg/day orally divided into 2–3 doses; titrate over 4–6 weeks up to 200–300 mg/kg/day; maximum 6 g/day. Not recommended in children <2 years.
Not recommended for use in pediatric patients.
Start at lowest dose (250 mg daily); titrate slowly due to increased risk of flushing, hypotension, and hepatotoxicity; monitor liver function and glucose closely.
No dose adjustment required, but monitor renal function due to age-related decline.
None.
There is no FDA black box warning for LIPIDIL.
Hepatotoxicity: elevated liver enzymes, hepatitis; discontinue if persistent elevations occur,Flushing: prostaglandin-mediated, can be reduced by taking aspirin prior; tolerance develops,Hyperuricemia: may precipitate gout,Hyperglycemia: may increase blood glucose; use with caution in diabetes,Peptic ulcer disease: reactivation may occur,Hypotension: can occur, especially with vasoactive drugs
Hepatotoxicity: elevated liver enzymes reported; monitor liver function,Myopathy/rhabdomyolysis: increased risk when combined with statins or in renal impairment,Renal impairment: dose adjustment required; avoid in severe renal impairment,Cholelithiasis: increased bile cholesterol saturation may lead to gallstones, Pancreatitis: despite triglyceride reduction, pancreatitis can occur
Hypersensitivity to niacin or any component of formulation,Significant or unexplained hepatic dysfunction,Active peptic ulcer disease,Arterial hemorrhage
Severe renal impairment (e GFR < 30 m L/min),Active liver disease including primary biliary cirrhosis,Pre-existing gallbladder disease,Hypersensitivity to fenofibrate or any component,Nursing mothers (due to potential for tumorigenicity in animal studies)
Avoid high-fat meals as they may increase risk of flushing. Take with low-fat snack. Alcohol and hot drinks can exacerbate flushing.
Take with food to enhance absorption. Avoid high-fat meals that may exacerbate hypertriglyceridemia. Grapefruit juice has minimal interaction but caution is advised with statin combinations. Alcohol should be limited or avoided due to potential for elevated triglycerides and hepatotoxicity.
FDA Pregnancy Category C. Niacin is not recommended for use in pregnant women due to potential fetal harm, though no well-controlled studies exist. In animal studies, high doses have caused fetal abnormalities. First trimester: Avoid use due to theoretical risk of teratogenicity. Second and third trimesters: Use only if clearly needed, as niacin can cause vasodilation and potential hypotension, which may reduce uteroplacental perfusion.
Lipidil (fenofibrate) is contraindicated in pregnancy. Animal studies show fetal toxicity at high doses. Human data are insufficient, but risk cannot be excluded. First trimester: possible embryotoxicity; second and third trimesters: potential for fetal harm due to interference with lipid metabolism.
Niacin is excreted into human breast milk in minimal amounts; M/P ratio unknown. The American Academy of Pediatrics considers niacin compatible with breastfeeding. However, high maternal doses may lead to adverse effects in the infant due to potential accumulation. Caution is advised; monitor infant for flushing or gastrointestinal disturbances.
Contraindicated during breastfeeding. Fenofibrate is excreted in breast milk in animal studies; M/P ratio unknown in humans. Potential for serious adverse effects in breastfed infants, including interference with fatty acid metabolism.
No specific dose adjustments recommended due to lack of pharmacokinetic studies in pregnant women. However, physiological changes in pregnancy (increased plasma volume, renal clearance) may reduce niacin levels, potentially requiring dose increase. Use the lowest effective dose and avoid extended-release formulations due to higher hepatotoxicity risk. Usual adult doses (500-2000 mg/day) may be used with caution.
Lipidil is contraindicated in pregnancy; no dose adjustment recommended. Therapy should be discontinued upon conception or if pregnancy is planned. There are no established dose adjustments for pregnant women due to lack of safety data.
Niacor (niacin) can cause profound flushing, which may be mitigated by taking aspirin 30 minutes prior or using extended-release formulations. Monitor liver function and blood glucose, as niacin can elevate transaminases and worsen glycemic control. Patients with gout may experience increased uric acid levels.
Lipidil (fenofibrate) is a PPARα agonist used primarily for severe hypertriglyceridemia and mixed dyslipidemia. Monitor renal function at baseline and periodically; reduce dose in CKD (e GFR <60 m L/min). Avoid in severe hepatic impairment or gallbladder disease. Combines with statins but increases risk of myopathy; monitor for muscle symptoms. May raise serum creatinine and homocysteine levels. Tablet should be swallowed whole; do not crush or chew.
Take with food to reduce stomach upset.,Do not crush or chew extended-release tablets.,Flushing is common and may decrease with continued use.,Avoid alcohol and hot beverages near dosing time to reduce flushing.,Report unexplained muscle pain, tenderness, or weakness.,Monitor blood sugar if diabetic.,Do not substitute with dietary supplements without doctor approval.
Take with food to improve absorption and reduce stomach upset.,Avoid alcohol as it can worsen triglyceride levels and liver effects.,Report unexplained muscle pain, tenderness, or weakness immediately.,Inform your doctor if you have kidney or liver disease, or gallbladder problems.,This medication may increase the effects of blood thinners (warfarin); monitor INR closely.,Do not take if you are pregnant or breastfeeding without consulting your doctor.
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 NIACOR vs LIPIDIL, answered by our medical review team.
NIACOR is a Antilipemic agent that works by Niacin (nicotinic acid) reduces VLDL and LDL synthesis by inhibiting lipolysis in adipose tissue, decreasing free fatty acid flux to the liver, and inhibiting hepatic triglyceride synthesis. It also increases HDL by reducing catabolism of apolipoprotein A-I.. LIPIDIL is a Fibrate Antilipemic that works by LIPIDIL (fenofibrate) is a fibric acid derivative that activates peroxisome proliferator-activated receptor-alpha (PPAR-alpha), leading to increased lipolysis and clearance of triglyceride-rich particles, and increased synthesis of apolipoproteins A-I and A-II.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between NIACOR and LIPIDIL 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 NIACOR is: Initial: 250 mg orally once daily after evening meal; titrate up by 250–500 mg/day every 2–4 weeks. Maintenance: 1–2 g/day in divided doses (2–3 times daily). Maximum: 6 g/day.. The standard adult dose of LIPIDIL is: 130 mg orally once daily.. 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 NIACOR and LIPIDIL 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. NIACOR is classified as Category C. FDA Pregnancy Category C. Niacin is not recommended for use in pregnant women due to potential fetal harm, though no well-controlled studies exist. In animal studies, high doses ha. LIPIDIL is classified as Category C. Lipidil (fenofibrate) is contraindicated in pregnancy. Animal studies show fetal toxicity at high doses. Human data are insufficient, but risk cannot be excluded. First trimester: . Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.