I've been using semaglutide as prescribed to me by a doctor through a compounding pharmacy. However, the cost was getting a bit ridiculous. I am using it for weight loss and not for diabetes or health issues.

To help save money (or what I thought would help save money), I bought a bottle of semaglutide online. (bottle pictured below)

The bottle notes that it's 5mg and is in powder form, which means I need to reconstitute it. And that's where I need the help. The bottle will accept about 2ml of bacteriostatic water.

If the dosage is meant to be at 2.4mg per week and I inject 2ml of water, then this bottle would last me 2 doses? Am I understanding that correctly? And I would need to pull ~1ml with each dose? This seems wildly off to me, but I could be wrong. Mostly because I would need to inject 4x if I used the insulin needles.

For reference, here is an overview of what I received from the compounding pharmacy. Note: This has B12 in it.

Semaglutide / Cyanocobalamin Injection (2.5 mL)
Strength: 5/0.5 mg/mL

Here is my dosage cycle

Inject subcutaneously once weekly. Weeks 1-4: 0.05ml (5units), Weeks 5-8: 0.1ml (10units), Weeks 9 and On: 0.2ml (20 units)

I was at week 9+ so taking .2ml which would be 2mg. So slightly below the dosage that most are on for wegovy at 2.4mg.

Thanks to whoever can sort this. I should have paid closer attention in maths. All of this is much easier when not having to reconstitute, but I understand the need for this active ingredient.