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Liraglutide

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GLP-1 receptor agonist · Antidiabetic · Anti-obesity · Cardiovascular risk reduction agent
Liraglutide
Victoza (T2DM), Saxenda (obesity)
Liraglutide is a once-daily subcutaneous GLP-1 receptor agonist developed by Novo Nordisk and marketed as Victoza for type 2 diabetes mellitus (FDA-approved January 2010)[3] and as Saxenda at the higher 3.0 mg daily dose for obesity (December 2014).[4]

Liraglutide was the first daily GLP-1 RA to reach market — preceded only by twice-daily exenatide (Byetta, 2005).[1] It is the molecular predecessor and pharmacological template for semaglutide, differing principally in the fatty-acid tail (C16 palmitic vs C18 fatty diacid) and the spacer architecture — semaglutide's modifications extending the half-life from ~13 h to ~165 h, enabling weekly rather than daily dosing.[5]

Clinically, liraglutide is the first GLP-1 RA shown to reduce cardiovascular events in T2DM (LEADER) and remains the only GLP-1 RA with formal pediatric approval — Victoza for T2DM in children ≥10 y, Saxenda for obesity in adolescents ≥12 y.[6][3][4]

Experience

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Problems

<indication ref="diabetes-type-2" author="MDElliottMD"/> <indication ref="obesity" author="MDElliottMD"/> <indication ref="cv-risk-t2dm" author="MDElliottMD"/>

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Titration strategies

Victoza — standard T2DM titration0
0.6 mg SC daily × 1 week (tolerability ramp; not therapeutic)

→ 1.2 mg SC daily (typical maintenance) → 1.8 mg SC daily (max) if further glycemic control needed[3]

A pediatric protocol is identical, but with closer attention to tolerability and growth.[3]
Saxenda — standard obesity titration0
0.6 mg SC daily × 1 week

→ 1.2 mg × 1 week → 1.8 mg × 1 week → 2.4 mg × 1 week → 3.0 mg daily (maintenance)[4]

If a step is not tolerated, hold at the prior dose for an extra week before advancing. Discontinue if the patient cannot tolerate 3.0 mg after extended titration, or if they have not achieved ≥4% body-weight loss at 16 weeks on the maximum dose.[4]

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Effects

  • Nausea — dose-dependent, worst in the first 1–2 weeks of any new dose level[3]
  • Diarrhea / constipation (variable)[3]
  • Decreased appetite (the desired effect)[3]
  • Early satiety[4]
  • Injection-site reactions — uncommon, generally mild[3]
  • Headache (more common than with the weekly agents)[citation needed]

GI tolerability is generally somewhat better than twice-daily exenatide but worse than the long-acting weekly agents (dulaglutide, semaglutide, tirzepatide) at equivalent glycemic effect.[citation needed]

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Pharmacokinetics

The C16 fatty acid drives non-covalent albumin binding (~98%), protecting from DPP-4 cleavage and slowing renal clearance — terminal half-life ~13 hours, supporting once-daily dosing.[1][3] Cleared by proteolytic catabolism; no CYP-mediated metabolism. No dose adjustment for renal or hepatic impairment.[3]

Pharmacodynamics

At maintenance doses:

  • HbA1c reduction of ~1.0–1.5 percentage points at 1.8 mg/day (T2DM)[3]
  • Weight loss of ~2–3 kg at 1.8 mg/day in T2DM; ~5–8 kg (~5–10% body weight) at 3.0 mg/day in obesity without T2DM (SCALE trials)[7]
  • 13% relative risk reduction in MACE in T2DM with high CV risk (LEADER)[6]
  • Modest SBP reduction (~2–3 mmHg)[3]

    Interactions

No interactions reported yet.

Pregnancy and lactation

Avoid. Animal embryofetal toxicity is documented.[3] Discontinue before planned conception (the 13-hour half-life means washout is rapid — days, not weeks).

Monitoring

  • Baseline: HbA1c, weight, BP, renal function, lipid panel
  • Personal or family history of MTC or MEN2 — contraindicated, do not start[3]
  • Every 3 months for first year: HbA1c, weight, GI tolerability, signs of pancreatitis or gallbladder disease
  • Pre-procedure: skip the morning dose on the day of a planned procedure (per ASA 2024 guidance for daily-dosed GLP-1 RAs)[8]

    Patient counseling

  • Daily injection same time each day — pick a time you can stick with.[3]
  • GI side effects peak in first 1–2 weeks of each new dose level, then attenuate.
  • If a daily dose is missed and remembered within ~12 h, take it; otherwise skip and resume the next day. Do not double-dose.[3]
  • Surgery: skip the morning dose on procedure day.[8]
  • Pregnancy planning: discontinue before trying to conceive.[3]

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Relevant Literature

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See also

GLP-1 receptor agonist · Semaglutide · Dulaglutide · Tirzepatide · Exenatide · Type 2 diabetes mellitus · Obesity

References

  1. ↑ 1.0 1.1 1.2 Knudsen LB, Nielsen PF, Huusfeldt PO et al. (2000). Potent derivatives of glucagon-like peptide-1 with pharmacokinetic properties suitable for once daily administration. J Med Chem 43(9):1664–9. doi:10.1021/jm9909645
  2. ↑ Drucker DJ (2022). GLP-1 physiology informs the pharmacotherapy of obesity. Mol Metab 57:101351.
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 3.25 US FDA. Victoza (liraglutide) prescribing information. Novo Nordisk. https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/022341s027lbl.pdf
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 US FDA. Saxenda (liraglutide) prescribing information. Novo Nordisk. https://www.accessdata.fda.gov/drugsatfda_docs/label/2014/206321Orig1s000lbl.pdf
  5. ↑ Lau J, Bloch P, Schäffer L et al. (2015). Discovery of the once-weekly glucagon-like peptide-1 (GLP-1) analogue semaglutide. J Med Chem 58(18):7370–80. doi:10.1021/acs.jmedchem.5b00726
  6. ↑ 6.0 6.1 Marso SP et al. (2016). Liraglutide and cardiovascular outcomes in type 2 diabetes (LEADER). NEJM 375:311–22. doi:10.1056/NEJMoa1603827
  7. ↑ Pi-Sunyer X, Astrup A, Fujioka K et al. (2015). A randomized, controlled trial of 3.0 mg of liraglutide in weight management (SCALE Obesity and Prediabetes). NEJM 373(1):11–22. doi:10.1056/NEJMoa1411892
  8. ↑ 8.0 8.1 Kindel TL et al. (2024). Perioperative GLP-1 receptor agonist safety guidance. Surg Obes Relat Dis 20(12):1183–8.
[[File:31-amino-acid acylated peptide analog of human GLP-1 (7–37), with Arg34 substitution and a C16 palmitic acid linked via γGlu spacer at Lys26 — drives albumin binding for a ~13-hour half-life supporting once-daily dosing.[1]|frameless|240px|alt=Structure of Liraglutide]]
Summary
Classes
GLP-1 receptor agonist · Antidiabetic · Anti-obesity · Cardiovascular risk reduction agent
Common uses
Pharmacy
Starting dose
Victoza: 0.6 mg SC daily × 1 wk[3] · Saxenda: 0.6 mg SC daily × 1 wk[4]
Preparations
Pre-filled multi-dose pen (3 mL): Victoza 6 mg/mL (0.6 / 1.2 / 1.8 mg per day);[3] Saxenda 6 mg/mL (0.6 / 1.2 / 1.8 / 2.4 / 3.0 mg per day)[4]
US FDA Max
1.8 mg/day SC (Victoza, T2DM)[3] · 3.0 mg/day SC (Saxenda, obesity)[4]
Pharmacology
Routes
Subcutaneous (abdomen, thigh, upper arm); same time each day, with or without food[3]
Onset
Glycemic effect within days; weight effect over weeks to months[4]
Duration
~24 h (daily dosing)[3]
Half-life
~13 hours[3]
Bioavailability
SC ~55%[3]
Pregnancy
Avoid. Discontinue before planned pregnancy.[3]
Legal status
Rx-only;[3] not a controlled substance
Purported mechanism
Selective agonist of the GLP-1 receptor. Produces glucose-dependent insulin secretion, glucagon suppression, delayed gastric emptying, hypothalamic appetite suppression, and cardiovascular benefits independent of glycemia.[2]
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