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    Inclisiran

    High Evidence

    An approved, twice-yearly subcutaneous GalNAc-conjugated small interfering RNA (siRNA) from Novartis (originally discovered by Alnylam) that lowers LDL cholesterol by silencing PCSK9 (proprotein convertase subtilisin/kexin type 9), the liver protein that destroys LDL receptors. By switching off PCSK9 production inside hepatocytes, inclisiran leaves more LDL receptors on the liver surface to pull LDL cholesterol out of the blood - achieving roughly a 50% LDL reduction with an injection given only twice a year after a loading dose. Marketed as Leqvio, it was the first siRNA medicine approved for a chronic cardiovascular condition: the EU cleared it in December 2020 and the FDA in December 2021, and in July 2025 the FDA expanded the U.S. label to first-line monotherapy, dropping the requirement that it be added on top of a statin. Its Phase 3 ORION-9, ORION-10 and ORION-11 trials established the LDL benefit; a large cardiovascular outcomes program (VICTORION-2-PREVENT and others) is still running to test whether that LDL lowering prevents heart attacks and strokes. Inclisiran is the approved, real-world proof-of-concept for the GalNAc-siRNA cardiometabolic platform that newer investigational agents like zodasiran, solbinsiran, olpasiran and plozasiran build on.

    AliasesLeqvio+4 more
    EvidenceHigh Evidence
    Last Updated 2026-08-17
    Reading Time 6 min

    What It Is

    Inclisiran (brand name Leqvio; development codes ALN-PCSsc and ALN-60212) is a first-in-class, cholesterol-lowering small interfering RNA (siRNA) that reduces the liver's production of PCSK9 (proprotein convertase subtilisin/kexin type 9). PCSK9 is a hepatocyte-made protein that binds LDL receptors and marks them for destruction, so the more PCSK9 the body makes, the fewer LDL receptors remain to clear LDL cholesterol from the blood. Inclisiran is a double-stranded RNA conjugated to triantennary N-acetylgalactosamine (GalNAc), a sugar tag recognized by the asialoglycoprotein receptor found almost exclusively on liver cells; that tag delivers the siRNA into hepatocytes, where it harnesses the natural RNA interference (RNAi) pathway to bind and degrade the messenger RNA for PCSK9 before the protein can be made. Because RNAi silencing is catalytic and long-lasting, a single subcutaneous injection lowers PCSK9 - and therefore LDL cholesterol - for months, allowing inclisiran to be dosed at day 0, again at three months, and then only once every six months (roughly twice a year). The molecule was discovered by Alnylam Pharmaceuticals, licensed to The Medicines Company, and acquired by Novartis when it bought The Medicines Company in 2020; Novartis markets it as Leqvio. Inclisiran is used to lower LDL cholesterol in adults with primary hypercholesterolemia (including heterozygous familial hypercholesterolemia) or established atherosclerotic cardiovascular disease (ASCVD) who need additional LDL lowering. Unlike the earlier PCSK9 monoclonal antibodies alirocumab and evolocumab - which mop up PCSK9 protein already in the blood and are injected every two to four weeks - inclisiran shuts off PCSK9 production upstream, which is what enables its twice-yearly schedule. It is an approved prescription biologic, not a supplement or research chemical, and is given by or under the supervision of a healthcare professional.

    Also known as: Leqvio, ALN-PCSsc, ALN-60212, inclisiran sodium, PCSK9 siRNA (Novartis)

    Regulatory Status

    Approved prescription medicine

    FDA-approved (Leqvio, December 22, 2021), with a July 31, 2025 label update enabling first-line monotherapy; EU-approved since December 9, 2020; also approved in the UK, Canada and other markets. It is a physician-administered or physician-supervised subcutaneous injection dispensed by prescription - not a dietary supplement or research chemical.

    Why Researchers Study It

    Inclisiran matters because it proved that RNA interference could be turned into a convenient, chronic cardiovascular medicine: a twice-yearly injection that halves LDL cholesterol by silencing PCSK9 in the liver. Its LDL lowering is comparable to the PCSK9 antibodies but achieved with far fewer injections, which researchers and clinicians see as a way to improve adherence - a major problem in lipid management, where many patients stop taking daily pills. Because it is the first approved GalNAc-siRNA for a common chronic disease, inclisiran is the real-world template that the newer investigational siRNAs for triglycerides, Lp(a), remnant cholesterol and blood pressure are all measured against. The open scientific question it is now trying to answer is whether large, durable LDL reduction from an siRNA actually prevents heart attacks and strokes, which the VICTORION cardiovascular outcomes trials are designed to test.

    Proposed Mechanisms

    • GalNAc-conjugated small interfering RNA (siRNA) that enters liver hepatocytes and uses the RNA interference (RNAi) pathway to bind and catalytically degrade the messenger RNA encoding PCSK9, cutting the liver's production of the protein
    • PCSK9 normally binds LDL receptors and routes them for destruction; lowering PCSK9 spares LDL receptors so more of them stay on the hepatocyte surface and recycle, increasing clearance of LDL cholesterol from the blood
    • Triantennary N-acetylgalactosamine (GalNAc) conjugation targets the asialoglycoprotein receptor on liver cells, concentrating the siRNA in the liver and allowing a low-dose subcutaneous injection
    • Catalytic, long-lasting silencing means one dose lowers PCSK9 and LDL cholesterol for months, enabling dosing at day 0, day 90 and then every six months (roughly twice yearly)
    • Acts upstream of the PCSK9 monoclonal antibodies (alirocumab, evolocumab): rather than neutralizing PCSK9 protein already circulating, inclisiran stops the protein from being made in the first place

    Evidence Snapshot

    High Evidence
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    Medium
    High
    Study Type Model Outcome Link
    Phase 3 (ORION-10 and ORION-11, NEJM 2020) 3,178 adults with atherosclerotic cardiovascular disease (ORION-10, U.S.) or ASCVD/risk equivalents (ORION-11, Europe and South Africa) and LDL cholesterol >=70 mg/dL (>=1.8 mmol/L) despite maximally tolerated statin therapy; randomized to subcutaneous inclisiran 284 mg or placebo on day 1, day 90 and every 6 months, over 540 days Placebo-adjusted LDL cholesterol fell about 52% in ORION-10 and about 50% in ORION-11 at day 510, with time-averaged reductions of roughly 48-52% across the dosing interval; PCSK9 and apolipoprotein B also dropped. Adverse events were similar to placebo apart from more frequent, mostly mild and transient injection-site reactions Source
    Phase 3 (ORION-9, NEJM 2020) 482 adults with heterozygous familial hypercholesterolemia (HeFH) and elevated LDL cholesterol on maximally tolerated lipid-lowering therapy; randomized to inclisiran 284 mg or placebo on the same day 1 / day 90 / every-6-months schedule Inclisiran lowered LDL cholesterol by roughly 48% versus placebo at day 510 across a range of LDL-receptor genotypes, extending the benefit to an inherited high-cholesterol population Source
    Phase 2 extension (ORION-1 / ORION-3, Lancet Diabetes & Endocrinology 2022) Four-year open-label extension of the ORION-1 Phase 2 trial in adults at high cardiovascular risk with elevated LDL cholesterol, dosed subcutaneously roughly twice yearly LDL cholesterol reductions of about 45% were maintained over four years of repeat dosing with a safety profile consistent with the Phase 3 trials, supporting durability of the twice-yearly regimen Source
    Pooled safety analysis (JACC 2023) Pooled data from seven inclisiran clinical trials in patients with hypercholesterolemia Overall adverse-event rates were similar to placebo; the main difference was more frequent, mostly mild and transient injection-site reactions, with no signal for liver, kidney, muscle or platelet toxicity Source

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    Safety & Cautions

    • Inclisiran is a prescription medicine administered by or under the supervision of a healthcare professional; it is not a supplement or research chemical, and any product sold as 'inclisiran' or 'Leqvio' outside a pharmacy or clinical setting is unverified and unsafe
    • The most common side effects are injection-site reactions (redness, pain, rash) that are usually mild and transient; overall adverse events in trials were similar to placebo
    • Because RNA interference produces deep, months-long silencing of PCSK9, the effect of a dose cannot be quickly reversed once given
    • Inclisiran lowers LDL cholesterol, but a cardiovascular outcome benefit - fewer heart attacks and strokes - has not yet been proven and is still being tested in the VICTORION outcomes trials
    • As with any lipid-lowering therapy, use in pregnancy and breastfeeding has not been established, and dosing should follow current prescribing information and clinician guidance
    • It is typically added to diet and, where appropriate, statins or other lipid-lowering drugs; treatment decisions and monitoring should be individualized by a clinician

    Comparisons

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    Citations

    1. [1] Ray KK, Wright RS, Kallend D, et al. - Two Phase 3 Trials of Inclisiran in Patients with Elevated LDL Cholesterol (ORION-10 and ORION-11), New England Journal of Medicine (2020) PubMed
    2. [2] Ray KK, Troquay RPT, Visseren FLJ, et al. - Long-term efficacy and safety of inclisiran in patients with high cardiovascular risk and elevated LDL cholesterol (ORION-3): 4-year open-label extension of ORION-1, The Lancet Diabetes & Endocrinology (2022) PubMed
    3. [3] Wright RS, Koenig W, Landmesser U, et al. - Safety and Tolerability of Inclisiran for Treatment of Hypercholesterolemia in 7 Clinical Trials, Journal of the American College of Cardiology (2023) PubMed
    4. [4] Novartis - twice-yearly Leqvio (inclisiran) receives FDA approval for new indication enabling first-line use (July 31, 2025) PubMed
    5. [5] LEQVIO (inclisiran) injection, for subcutaneous use - U.S. Prescribing Information (Novartis) PubMed
    6. [6] Study of Inclisiran to Prevent Cardiovascular (CV) Events in Participants With Established Cardiovascular Disease (VICTORION-2-PREVENT), NCT05030428 PubMed
    7. [7] Leqvio (inclisiran) - EMA European Public Assessment Report overview PubMed

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