When you open a new pen, write down the date. It's a thirty-second job. The reason isn't medical — it's organisational.
There are storage windows attached to most pens after they're opened. The pharmacist or the pen's leaflet will tell you what those windows are for your particular medication and brand. What they can't tell you is when you actually opened the pen, because that's only in your head — and three months in it isn't in your head any more either.
Two practical things happen when you log the open-date. One: when the pharmacist asks at the next refill — and they often do, especially if there's been a delivery issue or a storage question — you have the answer in front of you instead of guessing. Two: when you're looking at the pen on a Tuesday wondering whether it's been longer than expected, you can scroll back and check rather than calling the pharmacy.
One: when the pharmacist asks at the next refill — and they often do, especially if there's been a delivery issue or a storage question — you have the answer in front of you instead of guessing.
Titra has a small date-field on the weekly entry that lives next to the dose log — open a new pen, tap the field, move on with the day. The note compounds quietly over time because every refill becomes a clean conversation rather than a guessing match. Boring, two-tap, runs in the background.
The most useful kind of organisational habit on a long-haul routine.