How long does Liraglutide stay in your system?
Liraglutide has a published half-life of approximately 13 hours. By the standard pharmacology rule of thumb, a drug is about 97% eliminated after roughly five half-lives, which here works out to about 65 hours. The Saxenda label gives the same 13 hours.
Source: Victoza label, DailyMed · FDA label · measured: subcutaneous · dataset reviewed September 23, 2026
What is the half-life of Liraglutide?
Both liraglutide labels, Victoza and Saxenda, give an elimination half-life of approximately 13 hours after subcutaneous injection. Liraglutide is a GLP-1 receptor agonist that is nearly identical to the body's own GLP-1, with one amino acid swapped and a fatty acid attached through a short spacer.
That fatty acid is what turns minutes into hours. It lets liraglutide bind reversibly to albumin and associate with itself, which slows both its breakdown and its clearance by the kidney. Semaglutide uses the same basic idea and reaches approximately 1 week, so the gap between 13 hours and a week shows how much the details of that chemistry matter.
How much Liraglutide is left after each half-life?
Each half-life removes half of whatever is left, so the percentages are pure arithmetic and the same for any compound; only the clock changes. For Liraglutide, one half-life is 13 hours. The rows below run that forward for a single amount with nothing added.
| Half-lives elapsed | Time elapsed | Remaining | Cleared |
|---|---|---|---|
| 1 | 13 hours | 50% | 50% |
| 2 | 26 hours | 25% | 75% |
| 3 | 39 hours | 12.5% | 87.5% |
| 4 | 52 hours | 6.25% | 93.75% |
| 5 | 65 hours | 3.13% | 96.88% |
| 6 | 3.3 days | 1.56% | 98.44% |
| 7 | 3.8 days | 0.78% | 99.22% |
Why do the numbers differ between sources?
For liraglutide they mostly do not. Victoza and Saxenda are one molecule labelled for two indications, and both labels give 13 hours, which makes this one of the cleanest values in our dataset.
When a different figure circulates, it is usually worth checking whether it describes something other than elimination: the time to peak concentration after injection, a value from another population, or a number for a different GLP-1 drug. Liraglutide, semaglutide and tirzepatide are often discussed together, and their half-lives are easy to swap by accident.
What does a half-life not tell you?
A 13 hour half-life means a single dose falls by roughly 97% within about 65 hours on this arithmetic, but it does not mean the effects on appetite or glucose end on that schedule. Those responses run through receptors and signalling that the plasma curve does not track.
It also says nothing about cardiovascular or weight outcomes. Those were established in outcome trials, LEADER and SCALE, that measured events and body weight directly. Pharmacokinetics explains how the drug moves through the body; it is not evidence about what the drug does.
Can you run the numbers yourself?
The estimator applies the same decay arithmetic to any half-life, starting amount and time you enter. It opens with Liraglutide's published value loaded. Type another figure to see how sensitive the result is to it.
Published value: Approximately 13 hours (Subcutaneous) · Victoza label, DailyMed · Compound profile
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What are the limits of this estimate?
Everything above is a single-compartment approximation: one pool of drug, falling by the same fraction in every interval. Real elimination varies with kidney and liver function, body composition, formulation and route, and a published figure describes only the route and the people it was measured in. Many compounds also show a fast distribution phase before the slower elimination the table describes.
A half-life is not a dosing schedule. Labelled intervals come from clinical trials that measured outcomes and tolerability, and nothing on this page suggests when to take, repeat or stop anything. Whether Liraglutide is out of your system for drug-testing purposes is a different question again. Tests often look for metabolites rather than the parent compound, and the answer depends on the assay, its sensitivity and the sample type, none of which a plasma half-life captures.
FAQ.
Why is liraglutide's half-life so much shorter than semaglutide's?
Both are acylated GLP-1 analogues that rely on albumin binding, but they carry different fatty-acid side chains and different amino acid changes. Liraglutide's chemistry gives approximately 13 hours on its label. Semaglutide's gives approximately 1 week. Small structural differences produce large pharmacokinetic ones.
Do Victoza and Saxenda have different half-lives?
No. Both labels give approximately 13 hours. They are the same molecule labelled for different indications, type 2 diabetes and weight management, so the elimination figure does not change between them.
How long until liraglutide is about 97% cleared?
By the five half-life rule of thumb, about 65 hours, or roughly 2.7 days, after a single dose. That is a single-compartment estimate. Real elimination varies with kidney and liver function and other individual factors, and repeated use builds toward a steady level that the estimate ignores.
For what the evidence on Liraglutide actually shows, read the Liraglutide profile. For approval and regulatory position, see is Liraglutide legal. The half-life reference lists every sourced value side by side, including the compounds where a number circulates online with no reliable human data behind it.