Wegovy, Ozempic, and Mounjaro are the three most widely used injection pens for treating obesity and type 2 diabetes. All three belong to the class of GLP-1 receptor agonists, but there are significant differences in their active ingredients, pen design, and click mechanics. In this article, we compare them side by side — with a particular focus on what matters if you are counting clicks.
What are GLP-1 receptor agonists?
GLP-1 (glucagon-like peptide-1) is a hormone that your body naturally produces in the gut after a meal. It stimulates insulin production, lowers blood sugar, and reduces appetite. GLP-1 receptor agonists mimic this hormone and amplify its effect.
Mounjaro is slightly different: it is a so-called dual agonist that activates both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) receptors. This can potentially provide a stronger effect on weight loss and blood sugar control.
Comparison table
| Wegovy | Ozempic | Mounjaro | |
|---|---|---|---|
| Manufacturer | Novo Nordisk | Novo Nordisk | Eli Lilly |
| Active ingredient | Semaglutide | Semaglutide | Tirzepatide |
| Receptor | GLP-1 | GLP-1 | GLP-1 + GIP |
| Pen type | FlexTouch | FlexPen | KwikPen |
| Click mechanism | Variable mg/click per strength | Fixed 0.01 mg/click | 60 clicks for all strengths |
| Approved for | Weight management | Type 2 diabetes | Type 2 diabetes (+ weight loss in some countries) |
| Shelf life after opening | 8 weeks | 8 weeks | 21 days |
Pen mechanics and click counting
For those who dose-split, the pen's click mechanism is crucial. Here is where the three pens differ significantly:
Wegovy (FlexTouch)
Wegovy uses Novo Nordisk's FlexTouch pen, designed as a single-dose pen. The click mechanism varies between strengths: a 0.25 mg pen has a different mg-per-click ratio than a 2.4 mg pen. This means you need to know the exact number of clicks for your specific pen strength and desired dose. ClickDose has all this data built in, so you always count the correct number.
Ozempic (FlexPen)
Ozempic uses a FlexPen with a rotatable dose knob. This pen delivers a fixed 0.01 mg per click — regardless of which pen strength you have. This makes click counting more straightforward: for 0.25 mg, you dial 25 clicks. For 0.5 mg, you dial 50 clicks. The consistent mechanism makes Ozempic one of the easier pens to dose-split with.
Mounjaro (KwikPen)
Mounjaro uses Eli Lilly's KwikPen platform. What is unique about Mounjaro is that all strengths contain exactly 60 clicks for a full dose. Whether you have a 2.5 mg or a 15 mg pen, there are always 60 clicks. This makes it simple to calculate fractions: half is 30 clicks, a quarter is 15 clicks, and so on.
Approved uses
It is important to distinguish what the three medications are officially approved for:
- Wegovy is specifically approved for weight management in adults with obesity (BMI of 30 or greater) or BMI of 27 or greater with at least one weight-related comorbidity.
- Ozempic is approved for the treatment of type 2 diabetes. Although it is widely used off-label for weight loss, that is not its primary approval.
- Mounjaro is primarily approved for type 2 diabetes, but in some countries (including the US, under the brand name Zepbound) it has also received approval for weight management.
Note that while Wegovy and Ozempic both contain semaglutide, their dosing and intended purpose differ. Your doctor will choose the right medication based on your diagnosis and treatment goals.
Cost and availability
Pricing varies significantly between countries and depends on insurance coverage and subsidy programs. In general, all three medications are expensive without coverage, which is one of the reasons many people consider dose-splitting. It is important to emphasize, however, that savings should never come at the expense of safety.
ClickDose supports all three
No matter which pen you use, ClickDose supports all three medications. Simply select your pen type and strength in the app, and ClickDose automatically calculates the correct number of clicks for your desired dose. The sound sensor counts clicks in real time, so you always know exactly how many clicks you have administered.
ClickDose knows all the variations in click mechanics — from Wegovy's variable mg/click to Mounjaro's fixed 60 clicks — and adapts automatically. You do not need to remember the numbers yourself.