Step 1 of 6
Mounjaro 2.5mg (tirzepatide 2.5mg)
The starter dose. Used for the first four weeks to allow your body to adjust to tirzepatide. Not intended for long-term weight management.
When Mounjaro 2.5mg is appropriate
First-time users of any GLP-1 / GIP receptor agonist. The 2.5mg dose is a tolerability step — it is rarely effective for sustained weight loss on its own. After four weeks your prescriber will usually escalate you to 5mg.
What to expect at 2.5mg
Most side effects occur during the first weeks at this dose as your body adjusts. Common: mild nausea, reduced appetite, occasional digestive changes. These typically settle within 1–2 weeks. Weight loss at 2.5mg is variable and modest — the goal of this dose is safety, not results.
Dose decisions are made by your prescriber.
You cannot select a dose strength directly. Treatment always starts at 2.5 mg and escalates in 2.5 mg steps every four weeks at the earliest, based on how you respond and tolerate the medicine.
Side-effect profile at this dose
Mounjaro's side-effect profile is dose-dependent. Gastrointestinal effects (nausea, diarrhoea, vomiting, constipation, abdominal pain, reduced appetite) are most common during the first one to two weeks at any new dose and usually settle. Higher doses carry a higher risk of these effects. Serious effects — including acute pancreatitis, severe allergic reaction, and gallbladder problems — are uncommon but possible at every dose and require urgent medical advice.
See the full side-effect guide for detail.
Questions specific to 2.5mg
When is Mounjaro 2.5mg used?
First-time users of any GLP-1 / GIP receptor agonist. The 2.5mg dose is a tolerability step — it is rarely effective for sustained weight loss on its own. After four weeks your prescriber will usually escalate you to 5mg.
What should I expect on Mounjaro 2.5mg?
Most side effects occur during the first weeks at this dose as your body adjusts. Common: mild nausea, reduced appetite, occasional digestive changes. These typically settle within 1–2 weeks. Weight loss at 2.5mg is variable and modest — the goal of this dose is safety, not results.
Can I start treatment directly on Mounjaro 2.5mg?
Yes — every patient new to tirzepatide starts at 2.5mg for the first four weeks, regardless of weight or BMI. This is the tolerability step.
Is Mounjaro 2.5mg the maximum dose?
No. The maximum licensed dose of Mounjaro is 15mg. 2.5mg sits at step 1 of six. Your prescriber will only escalate beyond 2.5mg if there is a clear continued clinical benefit and you are tolerating the medicine.