Retatrutide Dosing Guide | Expected Dose Schedule UK

Retatrutide is not yet widely available, but clinical trials give a clear indication of how dosing is expected to work. This guide explains the likely dose schedule, how it increases over time, and what to expect when it becomes available.

Important Note

Retatrutide is still in clinical trials and is not currently approved for routine use. The dosing information below is based on published trial data and is intended for educational purposes only.

What You’ll Learn

Expected starting dose
How dosing increases over time
Typical maintenance doses
How Retatrutide compares to Mounjaro and Wegovy

Retatrutide Dose Schedule (Based on Trials)

1–2 mg Once Weekly

Clinical trials typically started participants on a low weekly dose to allow the body to adjust and reduce side effects.

2–4 mg Once Weekly

The first increase phase, where appetite suppression begins to become more noticeable.

4–8 mg Once Weekly

Mid-range doses used during escalation, often associated with stronger metabolic effects.

8–12 mg Once Weekly

Higher doses used as maintenance levels in clinical trials, where the strongest weight loss effects were observed.

How Dose Escalation Works

Retatrutide follows a gradual increase similar to other weight loss injections. In clinical trials, doses were typically increased every 4 weeks to balance effectiveness and tolerability.

This gradual approach helps reduce common side effects such as nausea and allows the body to adjust.

What Makes Retatrutide Different?

Retatrutide targets three hormone pathways (GLP-1, GIP, and glucagon), compared to one or two in existing treatments.

This triple-action approach is why dosing may feel more powerful and why careful escalation is important.

Expected Maintenance Dose

Clinical trials suggest maintenance doses will likely fall between 8 mg and 12 mg once weekly, depending on individual response and tolerance.

Not everyone may need the highest dose to achieve results.

How It Compares to Other Treatments

Wegovy: GLP-1 only, lower maximum dose
Mounjaro: GLP-1 + GIP dual action
Retatrutide: GLP-1 + GIP + glucagon (triple action)

When Will Retatrutide Be Available?

Retatrutide is currently in late-stage clinical trials. While timelines may change, it is expected to become available in the coming years once approvals are complete.

Not Sure What to Compare?

Available now? See Mounjaro Dosing Guide
Comparing options? Read Wegovy Dosing Guide
Future treatment? Stay updated on Retatrutide