Semaglutide titration: 0.25→0.5→1.0→1.7→2.4mg optimal schedule
Pinned because it affects plans people have already made, not because it is dramatic. Everything below is what is confirmed as of today.
This post is the record, and it will be edited as things change — with the change noted rather than substituted. If you have something firmer than what is here, a document or a date or a first-hand account, post it and it goes in with credit.
Read it this way:
- What is stated is confirmed; what is uncertain is marked as uncertain
- Anything time-sensitive is worth verifying yourself before you act on it
- The replies below carry the corrections, so read them before asking
Nothing here is advice about your situation, and the situation is still moving.
That's an excellent lay explanation and you've got the key concepts right. Let me add some precision.
The accumulation ratio for a drug given at intervals equal to its half-life is approximately 2:1. This means at steady state, your average plasma concentration is about twice what it would be from a single dose. Your peak-to-trough ratio of 1.5–2:1 is correct for once-weekly dosing.
Here's a concrete example. If you take 1.0mg weekly:
- Week 1: After injection, peak ~1.0 dose-equivalents. By end of week, ~0.5 remains.
- Week 2: You inject 1.0 on top of 0.5 remaining. Peak ~1.5. End of week ~0.75 remains.
- Week 3: Inject on top of 0.75. Peak ~1.75. End of week ~0.875.
- Week 4: Inject on top of 0.875. Peak ~1.875. End of week ~0.9375.
- Week 5 (≈ steady state): Inject on top of ~0.94. Peak ~1.94. End of week ~0.97.
You can see how the levels plateau. At steady state, you're oscillating between roughly 1 and 2 dose-equivalents. The drug never fully leaves, which is exactly what makes once-weekly dosing feasible.
Practical implication #1: If you stop taking semaglutide, it doesn't leave your system in one week. It takes 5–7 half-lives (5–7 weeks) for the drug to be essentially eliminated. This is why appetite changes can linger for over a month after the last dose.
Practical implication #2: Don't judge a new dose after one week. You haven't reached steady state. Give it the full 4–5 weeks.
[1] Marbury TC, et al. "Pharmacokinetics and Tolerability of a Single Dose of Semaglutide, a Human Glucagon-Like Peptide-1 Analog, in Subjects With and Without Renal Impairment." Clin Pharmacokinet. 2017;56(11):1381-1390.
Previously posted:If you stop taking semaglutide, it doesn't leave your system in one week. It takes 5–7 half-lives (5–7 weeks) for the drug to be essentially eliminated.
This is the thing that surprised me most when I learned about it. I panicked once when I missed a dose because I thought the drug would be "gone." But at steady state, missing one dose barely makes a dent. Your levels drop from maybe 2 units to 1.5 units — you still have MORE drug in your system than you did after your very first injection.
The long half-life is a feature, not a bug. It's what makes this drug so forgiving of the occasional missed or late dose.
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Shop Reference StandardsSo wait... when people say they feel the drug "wearing off" on day 6 or 7 of their weekly cycle, is that real or in their head? Because based on what you're saying, the levels barely drop during a single week.
It's probably a combination. At steady state, the trough level is about 50–65% of the peak. So there IS a measurable decline within each weekly cycle. Whether that 35–50% decline is enough to produce noticeable symptom changes is highly individual. Some people are sensitive to that fluctuation. Others aren't.
There's also a psychological component — if you know your injection day is tomorrow, you might be more attuned to hunger signals. The drug is absolutely still active at trough, just not at its maximum effect.