Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
ATROMID-S 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
Inhibits hepatic triglyceride synthesis and increases lipoprotein lipase activity, leading to reduced VLDL and triglycerides.
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.
Type III hyperlipoproteinemia,Hypertriglyceridemia (Fredrickson types IV and V) not responsive to diet
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)
500 mg to 1 g orally twice daily. Maximum dose 2 g/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 elimination half-life is 6-8 hours in patients with normal renal function; may be prolonged to 12-24 hours in renal impairment.
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.
Hepatic via glucuronidation and oxidation; major metabolite is clofibric acid.
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 excretion as glucuronide conjugates; approximately 60-70% of the dose is excreted in urine, 20-30% in feces via biliary elimination.
Primarily renal excretion of glucuronide conjugate, accounting for approximately 60-70% of elimination; fecal excretion accounts for about 25%. Minimal unchanged drug in urine.
>95% bound to plasma proteins, primarily albumin.
Highly protein-bound (>99%), primarily to albumin.
0.11-0.14 L/kg; low Vd indicates limited extravascular distribution, consistent with high protein binding.
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: approximately 60-70% due to first-pass metabolism; administered as clofibrate (prodrug) which is hydrolyzed to active clofibric acid.
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.
GFR 30-59 m L/min: 500 mg twice daily. GFR 15-29 m L/min: 250 mg twice daily. GFR <15 m L/min: avoid use.
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.
Child-Pugh Class B or C: avoid use or reduce dose by at least 50%; not recommended in severe hepatic impairment.
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.
Not recommended; safety and efficacy not established in pediatric patients.
Safety and effectiveness in pediatric patients have not been established; use not recommended in children.
Start at lower end of dosing range (500 mg twice daily). Monitor renal function; adjust dose based on GFR.
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.
None
There is no FDA black box warning for Tricor (micronized fenofibrate).
Hepatotoxicity,Cholelithiasis,Renal impairment dose adjustment,Rhabdomyolysis risk with statins,Malignancy risk (hepatic, GI)
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)
Hypersensitivity to clofibrate,Active liver disease,Severe renal dysfunction,Primary biliary cirrhosis,Pregnancy
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)
High-fat meals may reduce absorption; consistent timing of administration with food is recommended. Grapefruit juice may increase drug levels; avoid excessive intake. Alcohol may exacerbate hepatotoxicity.
Take with food to enhance absorption. Avoid grapefruit juice. Limit alcohol intake. Maintain a low-fat diet as part of triglyceride management.
FDA Pregnancy Category C. First trimester: Potential for teratogenicity based on animal studies showing skeletal and visceral anomalies. Human data limited; use only if benefit outweighs risk. Second and third trimesters: May cause fetal harm due to placental transfer and potential for reduced fetal growth.
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.
Excreted into breast milk in low amounts; M/P ratio not established. Due to potential for serious adverse effects in infants, a decision should be made to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother.
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 dosing adjustments recommended due to lack of data. However, pharmacokinetic changes in pregnancy (increased volume of distribution, altered metabolism) may necessitate careful monitoring and empiric dose adjustments based on clinical response and adverse effects.
No established dosing adjustments. Pharmacokinetics may be altered due to increased plasma volume and renal clearance; monitor efficacy and safety. Consider therapy discontinuation.
ATROMID-S (clofibrate) is a fibric acid derivative primarily indicated for hyperlipidemia but its use is now limited due to increased non-cardiovascular mortality and cholelithiasis risk. Monitor liver function and prothrombin time (potentiates warfarin). Not first-line; consider statins or fibrates like fenofibrate.
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 with meals to reduce gastrointestinal upset.,Report unexplained muscle pain, tenderness, or weakness; may indicate myopathy.,Avoid alcohol as it may increase liver enzyme elevations.,Notify your doctor if you develop gallstones symptoms (e.g., right upper abdominal pain, nausea).,Use effective contraception as clofibrate may cause fetal harm.
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 ATROMID-S vs TRICOR (MICRONIZED), answered by our medical review team.
ATROMID-S is a Antilipemic Agent that works by Inhibits hepatic triglyceride synthesis and increases lipoprotein lipase activity, leading to reduced VLDL and triglycerides.. 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 ATROMID-S 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 ATROMID-S is: 500 mg to 1 g orally twice daily. Maximum dose 2 g/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 ATROMID-S 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. ATROMID-S is classified as Category C. FDA Pregnancy Category C. First trimester: Potential for teratogenicity based on animal studies showing skeletal and visceral anomalies. Human data limited; use only if benefit out. 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.