# How to Track Your GLP-1 Cost Per Dose (Not Per Month)
Source: https://www.trackpep.com/blog/how-to-track-glp-1-cost-per-dose
> Educational information only. Not medical advice, and not a dosing recommendation. TrackPep records what you enter and converts a dose you were prescribed into a syringe reading; it never decides a dose for you. Talk to a licensed clinician.
Monthly headline prices hide what you actually spend. Here is the arithmetic for cost per dose and per month, why wastage matters more than the price tier, and how to keep the number without a spreadsheet.
## Short answer
Divide what you paid for a vial or pen by the number of doses you actually took from it, not by the number printed on the box. Log the purchase cost once, log every dose against that item, and your true cost per dose and per month falls out of the record automatically.
## Your monthly price is not your cost
**TrackPep does not sell, recommend, or help you obtain any medication.** We build a logging app. Prices quoted here are illustrative figures published by manufacturers on 2 September 2026 and change often. Talk to your prescriber or pharmacist about your treatment.
Every price you have been quoted is a **list**, and every list assumes perfect use. Four pens dispensed, four doses taken, one calendar month, no changes. Real treatment does not look like that: doses get missed, strengths change mid-supply, a pen fails, a vial expires with medication in it, a trip disrupts a week.
The number that survives all of that is **cost per dose actually taken**. It is trivially computable and almost nobody records it, because doing so needs two facts logged at two different times.
## The arithmetic
```
cost per dose = amount paid for the item / doses actually taken from it
cost per month = cost per dose x doses taken in that month
```
Worked with published self-pay figures from 2 September 2026:
| Scenario | Paid | Doses taken | Cost per dose |
|---|---|---|---|
| Zepbound KwikPen 2.5 mg, 1 month, all four used | $299 | 4 | $74.75 |
| Same box, one dose lost to a failed injection | $299 | 3 | $99.67 |
| Zepbound 10 mg on the $449 refill offer | $449 | 4 | $112.25 |
| Same, refill window missed so the $699 regular tier applies | $699 | 4 | $174.75 |
| Wegovy pen, post-promotional tier | $349 | 4 | $87.25 |
| Wegovy pill 1.5 mg, daily | $149 | 30 | $4.97 |
Two things jump out of that table.
**Wastage costs more than the tier.** Losing one dose out of four raises your per-dose cost by 33% — more than the difference between several adjacent price tiers. A single discarded pen is worth more than most of the shopping around people do.
**Conditional offers are a cadence, not a price.** The $449 row and the $699 row are the same medication at the same strength; the only difference is whether the refill happened inside the window Lilly's terms specify. If you are budgeting on a conditional offer, the refill date is part of the price and belongs in your log as a reminder.
## What to record, and when
Twice per supply cycle is enough.
**When a vial or pen arrives**, record:
1. **Amount paid** — the total, including any dispensing or membership fee that came with it. If a telehealth arrangement bills a separate monthly physician fee, that is part of your cost even though it is not part of the medication price. Several vendors bill this way; RonanRx, for instance, advertises a flat $39 monthly physician fee alongside its medication price.
2. **What it contains** — strength and volume, so a partially used vial is still countable.
3. **Lot number and expiry** — costs nothing to record and is the only thing that makes a later question about a specific batch answerable.
4. **Date received.**
**Every time you take a dose**, log it against that specific item. That link is the whole trick: it is what makes the divisor real rather than assumed.
## Where the money actually goes
Once you have a few cycles logged, three patterns tend to show up:
- **Titration months are expensive.** Moving up a strength mid-supply often means part of an old item goes unused while a new one starts. Real cost per dose spikes, then settles.
- **Expiry is silent spend.** Medication discarded at expiry never appears on a receipt as a loss, but it is money you paid for doses you did not take. A log with expiry dates surfaces it before it happens; see [BAC water and vial storage](/blog/bac-water-storage-safety) for the storage side of this.
- **Reconstitution arithmetic changes the divisor.** If you draw from a reconstituted vial, how many doses that vial yields depends on the concentration you prepared and the volume you draw. Get that wrong and every downstream cost figure is wrong too. The [reconstitution calculator](/tools/reconstitution-calculator) and the [syringe unit converter](/tools/syringe-unit-converter) exist for exactly that step, and [units, mL and mg conversion](/blog/units-ml-mg-syringe-conversion-guide) explains it longhand.
## How TrackPep handles it
TrackPep's inventory records a cost against each vial or pen you add, along with its contents and expiry, and every dose you log can be attached to the item it came from. That means the division above is a property of your record rather than something you reconstruct from memory and card statements at the end of the year — and if you switch brands, suppliers or price tiers, the change is visible in your own history at the point it happened.
What it does not do: recommend a dose, suggest a supplier, or tell you a price is good. It records what you enter and shows it back to you. See the [GLP-1 tracker](/glp-1-tracker) overview, or the [tirzepatide](/compounds/tirzepatide) and [semaglutide](/compounds/semaglutide) reference pages.
## Related reading
- [GLP-1 cost guide 2026](/blog/glp-1-cost-guide-2026) — all four price routes, dated
- [Tirzepatide cost in 2026](/blog/tirzepatide-cost-2026)
- [Semaglutide cost in 2026](/blog/semaglutide-cost-2026)
- [Peptide inventory management](/blog/peptide-inventory-management)
## Frequently asked questions
### Why is cost per dose different from the monthly price?
Monthly prices assume you use everything dispensed, on schedule. Missed weeks, titration changes, a failed injection, or a discarded pen all change the divisor. Cost per dose is what you actually paid for each injection you actually took.
### What should I record when a vial or pen arrives?
The amount paid, what it contains, the lot number and expiry, and the date it arrived. Then link each dose you log to that item. Those five fields are enough to compute cost per dose, cost per month, and how long a given item lasted.
### Does wastage really change the number much?
Substantially. A $299 box yielding four doses is $74.75 each; lose one dose and the same box costs $99.67 per dose — a 33% increase from a single event, with no change in the price you were quoted.
### Does TrackPep tell me what to pay or where to buy?
No. TrackPep records what you enter and shows your own history. It does not sell medication, recommend a supplier, or suggest a dose.
## Sources
- [Zepbound: Coverage and Savings (Eli Lilly) — self-pay prices, fetched 2 Sep 2026](https://zepbound.lilly.com/coverage-savings)
- [NovoCare Pharmacy self-pay pricing — fetched 2 Sep 2026](https://www.novocare.com/pharmacy.html)
By TrackPep Team.