Why last week's site is so hard to recall
A weekly injection is a twenty second event wedged between coffee and the rest of a Sunday morning. There's nothing memorable about it by design, and after a couple of days there's usually no physical trace either. Five to seven days is a long gap for an unremarkable memory to survive intact.
The failure mode is usually a confident wrong answer rather than a blank. You're fairly sure it was the left side last time, and being fairly sure isn't the same as knowing. When you can't recall at all, the fallback is the same convenient spot you always reach for, which quietly undoes the point of rotating in the first place.
Titration weeks make it worse. When the dose is changing you're already tracking a new number, sometimes a new pen and a new schedule, and the site is the first small detail to fall off the list.
Pick a fixed order and the next site picks itself
The bookkeeping trick is to stop treating each dose as a decision. Decide once on a repeating sequence of the sites your instructions allow, number them, and always take the next number in the list. Now there's only one fact to carry from week to week, which is where you stopped, and you're writing that down anyway.
The math is the whole benefit. With four positions in the loop and a weekly dose, each position comes back around roughly once a month. With eight positions it's once every two months. A sequence plus a last index is a closed problem you can answer in a second. Where have I been lately is an open one that gets harder every week.
Which areas belong in your loop is not my call and not the internet's. Your prescriber and the instructions for use that came with your medication define that list, including how many positions it should have. This page is about keeping the ledger. Your prescriber draws the map.
What to write down, and what to skip
Keep each entry short enough that you'll still be doing it in month seven.
- Date. Add the time if your schedule is tight or you're crossing time zones.
- Dose in mg. This matters most during titration, when the number changes and the weeks blur together.
- Site label. Use the same short label every single time. Writing "L abdomen" one week and "left belly" the next costs you five seconds of squinting at your own notes forever after.
- One optional line. Anything you want to raise at your next appointment.
Skip the rest. The elaborate logs are the ones I stop keeping. A rough log you keep for a year is worth more than a beautiful one you kept for three weeks, because the only question you're ever asking it is which position comes next.
Where each method breaks
Every way of doing this works fine on a calm week at home. The differences show up on the bad weeks.
| Method | Holds up when | Falls apart when |
|---|---|---|
| Wall calendar | You dose at home on a steady routine | You travel, or someone tidies the kitchen |
| Note on your phone | You're strict about the format | Entries get typed hours later from memory |
| Spreadsheet | You already live in spreadsheets | You're standing in a bathroom at 7am |
| Dose log in an app | Site, dose, and date go in as one entry and the next site is suggested | You don't open the app that day |
None of these is clever. The one that wins is the one you can complete in under ten seconds without deciding anything.
Where the record earns its keep
Appointments. "When did you move up, and how have the weeks since gone?" is a question you can answer in five seconds from a dated list and not at all from memory. If your log also carries your weight over the same period with the dose changes marked on it, the conversation gets shorter and a lot more concrete.
Travel. A different time zone and an unfamiliar bathroom is exactly where a routine that lived in your head quietly stops existing.
Shared administration. If a partner or a family member sometimes helps, a written sequence is the only way two people stay on one rotation instead of two overlapping ones.
Late or missed doses. What to do about a missed dose is a question for your prescriber, and the first thing they'll ask is when the last one was. Have the date ready rather than a guess.
What a rotation log will not do
It won't tell you whether a site is appropriate for you, and it can't evaluate anything you notice at a site afterward. If something looks or feels off where you injected, that's a call to your prescriber, and so is anything about your dose or your medication.
A rotation log is a memory aid for three fields: date, dose, position. That's the entire job. It's worth doing because the alternative is a guess every week, and a guess tends to land on the same spot you always use.