Semaglutide Dosage Guide: Weekly Protocol Explained

Semaglutide is a GLP-1 receptor agonist — the active ingredient in Ozempic and Wegovy — with the most robust human clinical data of any weight loss compound available. Its weekly dosing schedule follows a slow titration protocol designed to build tolerance and minimise the GI side effects that cause most people to quit. This guide covers the standard protocol, the rationale behind each step, and the practical considerations that determine success or failure.

Research use only. Research-grade semaglutide is not FDA-approved pharmaceutical Wegovy/Ozempic. Pharmaceutical semaglutide requires a prescription. This article describes the standard titration protocol used in clinical research. Not medical advice.

Standard Titration Schedule

Period	Dose	Frequency	Purpose & Notes
Weeks 1–4	0.25 mg	Once weekly	Starting dose — not therapeutic; purpose is GI tolerance. Most GI side effects occur here and diminish as the body adapts.
Weeks 5–8	0.5 mg	Once weekly	First therapeutic dose. Most people see meaningful appetite suppression at this level. GI effects typically less severe than the first 4 weeks.
Weeks 9–12	1.0 mg	Once weekly	Standard maintenance dose. The dose used in most SCALE trial data for efficacy. Many practitioners keep patients here long-term if tolerating well.
Weeks 13+	2.0 mg	Once weekly	High dose for non-responders to 1mg. Associated with greater weight loss but also more GI events. Not needed for everyone.

Why Slow Titration Is Non-Negotiable

Semaglutide slows gastric emptying significantly — this is part of its mechanism for reducing appetite and post-meal glucose spikes. But this same mechanism causes nausea, vomiting, and constipation when the dose is escalated too quickly.

The body adapts to delayed gastric emptying over 3–4 weeks at each dose level. The titration schedule is specifically designed to allow this adaptation before moving up. Studies show that roughly 60–70% of people who discontinue semaglutide early cite GI side effects as the primary reason — most of which are preventable with proper dose escalation.

If GI symptoms are severe at any dose: Stay at the current dose for an additional 4 weeks before escalating. The therapeutic goal is the highest tolerated dose, not the maximum possible dose.

Missed Doses

Semaglutide has a half-life of approximately 7 days — one missed dose does not significantly alter drug levels.

Missed dose, within 5 days

Inject as soon as remembered. Return to usual weekly schedule.

Missed dose, more than 5 days ago

Skip the missed dose. Resume on the next scheduled day. Do not double dose.

Missed 2+ consecutive doses

Consider restarting at a lower dose to re-establish GI tolerance before escalating again.

GI Management Tips

Inject on the same day each week to maintain steady drug levels

Inject in the evening — nausea peaks ~4–6 hours post-injection; sleeping through the worst of it helps

Avoid fatty or rich meals on injection day

Stay well hydrated — dehydration amplifies nausea

Don't rush titration — spending extra weeks at a lower dose is better than stopping due to side effects

Protein intake must be prioritised — semaglutide reduces appetite globally, and inadequate protein causes muscle loss

Semaglutide — Research Grade

Available from Base Peptides for research applications.

View at Base Peptides

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