Free tool

Shot day planner

Mark the days that matter in your week. See how every possible shot day lines up with your estimated level on those days.

Your week

The days that matter mostWeekend plans, busy work days, dinners out, travel.
On those days, I would rather be

Shot day that fits your week

Thursday

LowerHigher estimated level · rows: shot day · columns: day of the week

Planning math only. Before changing your shot day, check the instructions that came with your medication or ask your prescriber.

How to read the grid

Each row is a possible shot day. Each column is a day of your week. The darker the cell, the higher your estimated level that day, once your dose has settled. Your marked days are highlighted, and the row that fits them best is outlined.

The pattern is the same for every row, shifted by a day: the level peaks a day or two after the shot and is lowest the day before the next one. Tirzepatide (Zepbound, Mounjaro) has a shorter half-life than semaglutide (Wegovy, Ozempic), so its week has a bigger gap between high and low days.

Things people weigh when picking a day

  • Having the shot on a calm day at home, in case the first day or two feel off.
  • Where the weekend falls compared with the peak and the low point.
  • A day that is easy to remember, with a reminder at the same time each week.

None of these is a rule. Your prescriber can help you pick a day that fits your treatment.

Last updated September 26, 2026. Same level formulas as the Embera app and the GLP-1 level estimator.

Questions

What is the best day of the week for a GLP-1 shot?

There is no best day for everyone. The shot day decides which days of your week sit near your estimated peak and which sit at the low point before the next shot. People often pick it around their weekends, work days or social plans. This planner shows how each choice lines up with your week.

Can I change my shot day?

The instructions for these medications explain how to change your shot day, including a minimum time between two doses. Check the leaflet that came with your medication or ask your pharmacist or prescriber before you switch.

How is the level on each day worked out?

From the published half-life and absorption of your medication, once your dose has settled after several weeks. Each cell is the average estimated level over that day, as a share of the peak. It is an estimate, not a blood test.

What does the calendar reminder include?

A weekly event on the day and time you pick, titled Shot day. The file is created in your browser and nothing is sent to a server.

In the Embera app

Embera reminds you on shot day, counts down to your next dose on your home screen widget, and shows your real week from the shots you log.

See what the app does

More free tools

GLP-1 level estimatorSee how your estimated medication level moves through the week after your shot.Mixing & syringe converterTurn the dose on your prescription into syringe units, or plan how much water to add.Pen & vial run-out dateFind the date your supply runs out and when to order the refill.Injection site rotation chartA printable rotation chart with your dates filled in.Protein & fiber benchmarkA general daily protein and fiber benchmark for your weight, split by meal.

Track it every week, not just once.

Embera does this math for you from what you log. Free to use, no account, your data stays on your iPhone.

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