How GLP-1 dose titration works — and why doses start low

What “titration” means, in plain words

Titration just means starting at a low dose and increasing it in steps over time. For the semaglutide injections, MedlinePlus puts it simply: “Your doctor will probably start you on a low dose of semaglutide injection and increase your dose after 4 weeks.”⁵

Each medicine has its own schedule written into its label. The Ozempic label describes starting at 0.25 mg once weekly for 4 weeks, then 0.5 mg once weekly, with possible further steps to 1 mg and 2 mg if needed.¹ The Wegovy label describes the same 0.25 mg starting dose, then a step-up schedule (0.5 mg, 1 mg, 1.7 mg, and a maintenance dose).² For tirzepatide, both the Mounjaro and Zepbound labels describe starting at 2.5 mg once weekly for 4 weeks, then 5 mg, then increases in 2.5 mg steps after at least 4 weeks on the current dose.^3,4

The common thread: each step happens after a stretch of weeks on the current dose, not all at once. That’s the schedule the labels lay out — the actual timing and dose for any one person is something a prescriber decides.

Why the first dose isn’t the “working” dose

It can feel odd that the dose you begin on isn’t the one expected to do the most. The labels address this directly. The Ozempic label states: “The 0.25 mg dosage is intended for treatment initiation and is not effective for glycemic control.”¹ The Mounjaro label uses nearly identical language: “The 2.5 mg dosage is for treatment initiation and is not intended for glycemic control.”³

The Zepbound label makes the same point: “The 2.5 mg dosage is for treatment initiation and is not approved as a maintenance dosage.”⁴ In other words, these labels describe the lowest dose as a starting step — a way to begin the medicine — rather than the dose meant to carry the full effect.

Why the labels describe a slow step-up

The labels connect the gradual schedule to side effects. The Wegovy label says: “Follow the dosage escalation in Table 1 to reduce the risk of gastrointestinal adverse reactions.”² The Mounjaro and Zepbound labels use the same “to reduce the risk of gastrointestinal adverse reactions” language.^3,4

Gastrointestinal reactions are stomach-and-gut effects such as nausea, vomiting, and diarrhea. The Zepbound label notes that in its studies, “the majority of nausea, vomiting, and/or diarrhea events occurred during dose escalation and decreased over time.”⁴ The labels also describe flexibility when a step doesn’t sit well — for example, Wegovy: “If patients do not tolerate a dose during dosage escalation, consider delaying dosage escalation for 4 weeks.”² These describe how a prescriber adjusts the schedule — not steps to take on your own.

Who decides your dose (and what this app does)

A prescriber sets each person’s dose, decides when and whether to step it up, and decides what to do about a dose that’s hard to tolerate or one that was missed. MedlinePlus is explicit about the patient’s part: “Use semaglutide injection exactly as directed,” and “Do not use more or less of it or use it more often than prescribed by your doctor.”⁵ Please don’t start, stop, or change a dose — or act on a missed dose — without talking to your prescriber.

Tonic is a tracker and companion, not a medical provider. It can help you keep a record of what you took and when, and keep your questions in one place for your next appointment. It doesn’t set your dose, change your schedule, or tell you what to do about a symptom.