A good refill reminder is not a calendar alert set for "about a month from now". It counts how much you have, takes away each dose you log and tells you how many days you have left. When that number gets low, it reminds you to reorder while there is still time to do it without stress.
Running out of a regular medication is rarely about forgetting it exists. It is usually about the pack quietly emptying faster than you expected: a dose taken twice by mistake, a few tablets left at a partner's house, a script that ran out of repeats, a pharmacy that has to order it in. A supply-aware reminder catches all of these, because it watches the count rather than the calendar.
Why a monthly calendar reminder is not enough
A recurring reminder on the first of each month seems simple, but it drifts:
- Packs are not all 30 days. A box of 28, a bottle of 90 or a pack that changes size when the brand changes will all slide out of step with a monthly alert.
- Your dose can change. If your prescriber moves you from one tablet a day to two, a calendar alert has no idea.
- You start a new pack early. If you open the new box before the old one is finished, the old date no longer means anything.
- Some things are taken as needed. A reliever you use more in winter will run down faster in winter.
A count-based reminder adjusts to all of these on its own.
How supply tracking works
The idea is simple:
- You enter what you have now. Count the tablets, capsules or doses in the current pack. If it is a sealed box, use the number printed on it.
- The app takes away each dose you log. If you take one tablet twice a day, the count drops by two each day.
- It works out days left. Current count divided by daily use gives you a runway, such as "about 9 days left".
- It warns you before zero. When the runway drops below a threshold, you get a low-supply reminder.
- You log the refill. When you collect the new pack, add it to the count and the runway resets.
The count is only as good as your logging. If you take a dose and do not log it, the app thinks you have more than you do. That is one more reason to log from the notification or your watch at the moment you take it.
Setting the warning at the right point
How much warning you need depends on how you get your medication, not just on how much is left. Think about the slowest realistic path:
- Does your script have repeats left? If not, you need time to see your doctor first, which can mean a week or more.
- Does your pharmacy usually have it in stock? If it often has to be ordered in, add a couple of days.
- Do you use home delivery? Allow for postage and the odd delay.
- Is a public holiday coming up? Pharmacies and clinics keep shorter hours around Christmas, New Year and Easter.
A seven to ten day warning suits many people. If your path involves a doctor's appointment or a special order, two weeks is safer. You can always reorder early; you cannot easily reorder late.
What to enter for different kinds of medication
- Tablets and capsules. Count the units. If you take half a tablet, enter the dose as a half so the count drops correctly.
- Liquids. Track in millilitres if your app allows decimal amounts, or track bottles and set the warning when you open the last one.
- Inhalers. Many have a dose counter. Enter the number it shows and log each puff.
- Patches, injections and pens. Track the number of patches or pens rather than the medicine inside them.
- As-needed medicines. Supply tracking still works. The runway will move around more because your use does, which is exactly why it helps.
Habits that keep the count honest
- Recount once a month. Open the pack and check the real number against the app. Small differences creep in.
- Log refills the day you collect them. Not when you open the new pack.
- Note the repeats left on your script. Some apps have a notes field. When you see "0 repeats", book the appointment then.
- Keep the old pack until the new one is in hand. It sounds obvious, but a half-finished pack in a handbag has saved many a weekend.
For a fuller system, including what to do over holidays and when travelling, see our guide on how to never run out of medication.
How Cadence handles refills
In Cadence, supply tracking is free. Turn it on for any medication, enter your current count and the refill amount, and Cadence shows a Supply Runway with roughly how many days you have left. Each dose you log takes from the count. Low supply alerts warn you when it is time to reorder, and tapping Refilled adds the new pack in one step.
Because it counts real doses, it keeps up when your schedule changes, when you take an extra as-needed dose or when you skip one.
When to talk to your pharmacist
If you find you are running out earlier than expected, that is worth mentioning to your pharmacist or doctor, rather than quietly reordering. It may be a simple counting slip, or it may mean the dose or pack size needs another look. Pharmacists can also help you line up several medications so they all come due on the same day, which makes refills far easier to manage.
Frequently asked questions
Does a refill reminder order the medication for me?
No. A refill reminder tells you it is time to reorder. You still order through your pharmacy or doctor in the usual way.
What if I have two packs open at once?
Add them together and enter the total. The app only needs to know how many doses you have in hand.
Can I track supply for vitamins?
Yes. Vitamins and supplements run out too, and the same count works the same way.
What if I take a different amount on different days?
The count drops by whatever you log. A tapering or alternating schedule will show a runway that changes, which is correct.
Cadence is a free medication reminder app for iPhone and Apple Watch. It is not medical software and does not give medical advice. Cadence Pro is a one-time purchase, with no subscription.
