MK-0616
InvestigationalAn oral macrocyclic peptide PCSK9 inhibitor in Phase 3 development by Merck. Pivotal Phase 3 LDL-C trials are now published, and the CORALreef Outcomes cardiovascular trial (~14,500 participants) is ongoing. Phase 2 data showed greater than 60% LDL-C reduction. Would be the first oral peptide-based PCSK9 drug if approved.
Merck PCSK9 Inhibitor · Oral PCSK9
8 human studies
- Preclinical
- 33%
- Human research
- 67%
Based on 12 cited sources
Numeric assessment unreviewed
A historical numeric score is recorded but has not passed a current, compound-specific assessment review. No numeric score is displayed.
This is a limitation of the numeric assessment, not a measured absence of benefit. It does not re-review the separately recorded catalogue classification or establish efficacy or safety.
How It Works (Simplified)
MK-0616 is an oral macrocyclic peptide that inhibits PCSK9 (proprotein convertase subtilisin/kexin type 9), a protein that degrades LDL receptors on liver cells. By blocking PCSK9, MK-0616 increases the number of LDL receptors available to clear LDL cholesterol from the blood. Unlike existing injectable PCSK9 inhibitors (evolocumab, alirocumab), MK-0616 achieves this through oral administration — a significant advance for patient adherence.
Scientific Pathways
PCSK9 Inhibition: MK-0616 binds to PCSK9 in the circulation, preventing it from binding to and degrading hepatic LDL receptors. This increases LDL receptor density on hepatocytes, enhancing LDL-C clearance from plasma.
Macrocyclic Peptide Technology: The compound uses a constrained macrocyclic peptide scaffold that provides oral bioavailability — typically a major challenge for peptide therapeutics. This technology platform could enable oral delivery of other peptide drugs.
Clinical Evidence
Phase 2 Data: A randomized, double-blind Phase 2 trial demonstrated greater than 60% reduction in LDL-C from baseline with MK-0616, comparable to injectable PCSK9 inhibitors. Results were presented at ACC (American College of Cardiology) and published in peer-reviewed journals.
CORALreef Phase 3 Program: The CORALreef cardiovascular outcomes trial (NCT06008756) enrolled approximately 14,500 patients across multiple global sites. This is one of the largest cardiovascular outcomes trials currently underway and evaluates hard cardiovascular endpoints (MACE); pivotal LDL-C-lowering trials in the program (CORALreef Lipids, AddOn, and a heterozygous familial hypercholesterolemia trial) have completed and been published.
Safety Profile
Phase 2 data showed MK-0616 was generally well tolerated with a safety profile comparable to placebo. No significant hepatic, renal, or musculoskeletal safety signals were identified. The oral route eliminates injection site reactions associated with current PCSK9 inhibitors. Full safety characterization awaits Phase 3 completion.
Important Limitations
- Pivotal Phase 3 LDL-C data published; hard cardiovascular outcomes data still pending (CORALreef Outcomes trial ongoing)
- No regulatory approval yet; no NDA filed
- Oral bioavailability of peptides can vary with food and GI conditions
- Long-term safety beyond Phase 2 duration not yet characterized
- Not available outside clinical trials
- Commercial viability depends on cost competitiveness with generic statins
Use the source links in the research discussion above to inspect the referenced records.
This dossier synthesizes available evidence from peer-reviewed literature, regulatory documents, and clinical trial registries. Evidence strength labels summarize the cited material for this entry and should be read alongside its population, model, and study limitations.
For complete methodology details, see our Methodology page.
Important Disclaimer
This dossier is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making health decisions.
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