Loading...
Loading...
Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 500 mg/1 | TABLET | ORAL | 71740-001 |
Detailed information about Niacor
References used for this content
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Niacor, you must consult a qualified healthcare professional.
Niacin (Vitamin B3) is a nicotinic acid derivative used pharmacologically as an antilipemic agent to treat dyslipidemia and hypertriglyceridemia, as well as to treat and prevent pellagra (vitamin B3 deficiency).
Dosage for Niacin must be highly individualized and typically follows a 'start low and go slow' approach to improve patient tolerance, particularly regarding the flushing response.
Niacin is generally not recommended for use in children for the treatment of hyperlipidemia. Safety and effectiveness in pediatric populations (under age 16) have not been established in large-scale clinical trials. If a specialist determines it is necessary for a child with familial hypercholesterolemia, dosing is strictly weight-based and requires intensive monitoring by a pediatric lipidologist.
Niacin has not been specifically studied in patients with kidney disease. However, since Niacin and its metabolites are excreted renally, it should be used with extreme caution in patients with renal impairment. Dose reductions may be necessary, and monitoring for adverse effects should be frequent.
Niacin is contraindicated (should not be used) in patients with active liver disease or unexplained persistent elevations in liver enzymes (transaminases). In patients with a history of liver disease, it should be used with significant caution and at the lowest effective dose.
Clinical studies suggest that elderly patients (over 65) may be more sensitive to the side effects of Niacin, particularly orthostatic hypotension (dizziness upon standing) and gastrointestinal distress. Lower starting doses and slower titration are recommended.
Proper administration is vital to minimize side effects:
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and return to your regular schedule. Do not double the dose to catch up. If you stop taking Niacin for several days, consult your doctor before restarting; you may need to start at a lower dose again to avoid severe flushing.
Signs of Niacin overdose may include severe flushing, dizziness, fainting (due to low blood pressure), nausea, vomiting, and abdominal pain. In the event of an overdose, contact a poison control center or seek emergency medical attention immediately. Treatment is generally supportive, focusing on maintaining blood pressure and hydration.
> Important: Follow your healthcare provider's dosing instructions exactly. Do not adjust your dose or switch brands without medical guidance, as different brands of Niacin are not bioequivalent.
The most pervasive side effect of Niacin is flushing. This is characterized by a sensation of warmth, redness, itching, or tingling, typically occurring in the face, neck, and chest. It is caused by the release of prostaglandins which dilate the blood vessels in the skin. While harmless, it can be distressing.
Other common side effects include:
> Warning: Stop taking Niacin and call your doctor immediately if you experience any of these serious symptoms.
With prolonged use, Niacin may contribute to a persistent increase in insulin resistance, potentially leading to the development of Type 2 diabetes in patients who were already at risk. Long-term use also requires ongoing monitoring of liver enzymes (AST/ALT) to ensure no chronic hepatic inflammation is occurring. Some patients may develop chronic dry skin or ichthyosis (scaly skin) with years of high-dose therapy.
No FDA black box warnings currently exist for Niacin. However, the FDA has issued several safety communications regarding the lack of evidence for Niacin reducing cardiovascular events when added to statin therapy, leading to the withdrawal of approval for Niacin/statin combination products (like Advicor and Simcor) in 2016.
Report any unusual symptoms to your healthcare provider immediately. Regular blood work is necessary to monitor for these potential complications.
Niacin is a potent pharmacological agent and should not be viewed simply as a 'vitamin supplement' when used for cholesterol management. It requires professional medical supervision. Patients must be aware that Niacin can significantly alter blood sugar, uric acid, and liver function.
There are no FDA black box warnings for Niacin. However, clinical trials such as AIM-HIGH and HPS2-THRIVE have demonstrated that adding Niacin to statin therapy does not further reduce the risk of heart attack or stroke, despite improving lipid levels, and may increase the risk of serious non-fatal side effects.
To ensure safety, healthcare providers typically require the following laboratory tests:
Niacin may cause dizziness or lightheadedness, especially during the first few weeks of treatment or when the dose is increased. Patients should observe how they react to the medication before driving or operating heavy machinery.
Alcohol consumption should be strictly limited while taking Niacin. Alcohol can worsen the flushing response, increase the risk of gastrointestinal irritation, and significantly increase the risk of liver damage when combined with Niacin.
Niacin does not typically require a tapering period to avoid withdrawal symptoms. However, if Niacin is discontinued for a period of time, it should not be restarted at the previous high dose. Patients must restart at the lowest dose and re-titrate upward to minimize the risk of severe flushing and adverse reactions.
> Important: Discuss all your medical conditions, especially liver disease, diabetes, and gout, with your healthcare provider before starting Niacin.
Niacin can cause false-positive results in certain urine glucose tests (those using copper sulfate reagents like Benedict's solution). It may also interfere with the results of tests for plasma catecholamines, potentially leading to false-positive results for pheochromocytoma (a rare adrenal tumor).
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including 'flush-free' Niacin products which may not be effective for lipid control.
Niacin therapy is strictly prohibited in the following circumstances:
In these conditions, the risks of Niacin may outweigh the benefits, requiring a careful risk-benefit analysis by a physician:
There is no significant evidence of cross-sensitivity between Niacin and other classes of lipid-lowering drugs (like statins or fibrates). However, patients sensitive to nicotinamide (niacinamide) should be cautious, although nicotinamide does not cause the same flushing response as nicotinic acid.
> Important: Your healthcare provider will evaluate your complete medical history, including liver health and history of ulcers, before prescribing Niacin.
Niacin is classified as FDA Pregnancy Category C. This means that animal reproduction studies have shown an adverse effect on the fetus, and there are no adequate and well-controlled studies in humans. However, the use of pharmacological doses of Niacin during pregnancy is generally not recommended. While Niacin is a necessary vitamin, the high doses used to treat cholesterol are far above the Recommended Dietary Allowance (RDA). Since cholesterol is essential for fetal development, lowering it artificially during pregnancy may be harmful. Niacin should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
Niacin is excreted into human breast milk. Because of the potential for serious adverse reactions in nursing infants from pharmacological doses of Niacin, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother. Most experts recommend avoiding high-dose Niacin while breastfeeding.
Safety and effectiveness in children and adolescents under the age of 16 have not been established. While Niacin has been used off-label in children with rare, severe genetic lipid disorders, this is done only under the strict supervision of a pediatric specialist. The risk of growth interference or metabolic disruption in children has not been thoroughly studied.
Clinical studies of Niacin did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. However, elderly patients are more likely to have decreased renal or hepatic function and are more prone to the hypotensive effects of Niacin. In older adults, the 'start low, go slow' titration strategy is even more critical to prevent falls related to dizziness.
There are no formal studies of Niacin in patients with renal impairment. Because Niacin and its metabolites are cleared by the kidneys, there is a risk of drug accumulation in patients with chronic kidney disease (CKD). Patients with a GFR (Glomerular Filtration Rate) below 60 mL/min/1.73m² should be monitored closely for signs of toxicity.
Niacin is contraindicated in patients with active liver disease. For those with stable, chronic liver issues, Niacin should be used with extreme caution. If liver enzymes (AST or ALT) rise to three times the upper limit of normal, Niacin must be discontinued immediately. The use of extended-release or sustained-release formulations requires even more frequent monitoring in this population due to the increased risk of dose-related hepatotoxicity.
> Important: Special populations require individualized medical assessment and more frequent laboratory monitoring.
Niacin (nicotinic acid) acts through several distinct mechanisms to modify lipid profiles. Its primary action is the inhibition of lipolysis in adipose tissue. By acting as an agonist on the HCAR2 (GPR109A) receptor in adipocytes, it reduces the breakdown of triglycerides into free fatty acids. This results in a decreased flux of free fatty acids to the liver. Consequently, the liver has fewer substrates to produce VLDL (Very Low-Density Lipoprotein).
Additionally, Niacin directly inhibits the enzyme diacylglycerol acyltransferase-2 (DGAT2) in the liver, which is the final step in triglyceride synthesis. For HDL (High-Density Lipoprotein), Niacin decreases the catabolic rate of HDL-cholesterol by inhibiting the hepatic uptake of apolipoprotein A-I, thereby increasing the amount of HDL available to participate in reverse cholesterol transport (moving cholesterol away from the arteries).
The lipid-lowering effects of Niacin are dose-dependent. Significant reductions in triglycerides and VLDL are typically seen within 1 to 4 days of starting therapy. The effects on LDL and HDL cholesterol may take several weeks to become fully apparent. Unlike statins, Niacin does not significantly affect the synthesis of cholesterol in the liver but rather focuses on the transport and mobilization of fatty acids.
| Parameter | Value |
|---|---|
| Bioavailability | 60% to 90% (Extensive) |
| Protein Binding | < 20% |
| Half-life | 45 minutes (Immediate Release) |
| Tmax | 30-60 min (IR); 4-5 hours (ER) |
| Metabolism | Hepatic (Saturable pathways) |
| Excretion | Renal (60% to 90% as metabolites) |
Niacin is classified as a water-soluble B-complex vitamin (Vitamin B3) and pharmacologically as an antilipemic agent. It is the only member of the Nicotinic Acid class of lipid-modifying drugs. While related to nicotinamide, it is important to note that nicotinamide does not have the same lipid-lowering properties as nicotinic acid.
Common questions about Niacor
Niacin is primarily used to treat various forms of high cholesterol (dyslipidemia) and high triglycerides. It works by lowering 'bad' cholesterol (LDL) and fats (triglycerides) while increasing 'good' cholesterol (HDL). Additionally, it is used to treat and prevent pellagra, a condition caused by a deficiency of Vitamin B3. In some cases, it is prescribed to help reduce the risk of a second heart attack in people with high cholesterol. It is often used as an add-on therapy when other medications like statins are not enough or are not tolerated.
The most common side effect is 'niacin flushing,' which causes redness, itching, and a warm sensation on the face and neck. This usually happens shortly after taking the dose and can last for about an hour. Other frequent side effects include stomach upset, nausea, bloating, and dizziness. Most of these effects decrease over time as your body adjusts to the medication. Taking Niacin with food and avoiding hot drinks can help minimize these symptoms.
It is strongly recommended to avoid or significantly limit alcohol while taking Niacin. Alcohol can worsen the flushing side effect, making it much more severe and uncomfortable. More importantly, both Niacin and alcohol are processed by the liver, and combining them increases the risk of serious liver damage. Alcohol can also increase the risk of stomach irritation and ulcers when taken with Niacin. Always discuss your alcohol consumption habits with your doctor before starting this medication.
Niacin is generally not recommended in pharmacological doses (high doses for cholesterol) during pregnancy unless specifically directed by a doctor. While it is an essential vitamin, the high doses used for lipid control could potentially interfere with fetal development. Most doctors recommend stopping Niacin if you become pregnant, as cholesterol is actually needed for the baby's growth. If you are pregnant or planning to become pregnant, you must discuss alternative cholesterol management strategies with your healthcare provider. Nutritional doses found in prenatal vitamins are generally considered safe.
Niacin begins to affect your triglyceride levels quite quickly, often within the first few days of treatment. However, its full effects on LDL ('bad') and HDL ('good') cholesterol levels usually take longer, typically between 3 to 6 weeks of consistent use. Your doctor will likely perform blood tests after 4 to 12 weeks to see how well the medication is working. It is important to continue taking the medication even if you do not feel any different, as high cholesterol does not usually have symptoms. Patience is key during the initial dose-titration phase.
While Niacin does not cause a 'withdrawal' syndrome, you should not stop taking it without consulting your doctor. If you stop taking Niacin for more than a few days and then restart at your previous high dose, you may experience extremely severe flushing and gastrointestinal distress. If treatment is interrupted, you usually need to restart at a very low dose and slowly work your way back up. Stopping Niacin will also cause your cholesterol and triglyceride levels to return to their previous unhealthy levels. Always have a plan with your physician before discontinuing any long-term medication.
If you miss a dose of Niacin, take it as soon as you remember with a small snack. However, if it is almost time for your next scheduled dose, skip the missed dose entirely and continue with your regular timing. Never take two doses at once to make up for a missed one, as this significantly increases the risk of severe flushing and liver toxicity. If you miss several days of Niacin, do not restart your usual dose; instead, call your doctor for instructions on how to safely restart the medication at a lower dose.
Niacin is not typically associated with weight gain; in fact, it has no direct effect on body fat or caloric intake. Some patients might experience slight weight changes due to dietary modifications often prescribed alongside Niacin for cholesterol management. If you notice rapid or unusual weight gain, it is more likely related to other factors or could potentially be a sign of fluid retention, which should be reported to your doctor. Niacin's primary role is modifying blood fats, not body weight. Always maintain a heart-healthy diet as instructed by your healthcare provider.
Niacin can interact with many other medications, including blood pressure drugs, diabetes medications, and other cholesterol-lowering drugs like statins. For example, taking Niacin with a statin can increase the risk of muscle damage. It can also interfere with how well your body handles insulin or oral diabetes drugs. Because of these potential interactions, it is vital to provide your doctor and pharmacist with a complete list of all prescriptions, over-the-counter drugs, and herbal supplements you are taking. Your doctor may need to adjust your doses to ensure all your medications work safely together.
Yes, Niacin is available in several generic forms, including immediate-release and extended-release tablets. Generic versions are typically much less expensive than brand-name versions like Niaspan. However, it is important to note that different generic formulations may not behave exactly the same way in the body. You should not switch between different brands or generic manufacturers without consulting your pharmacist or doctor, as the rate of absorption can vary, potentially leading to increased side effects or reduced effectiveness.
Other drugs with the same active ingredient (Niacin)