Health App Incorrect Medication Schedule

If you are experiencing this bug with non-daily interval schedules ("Every Few Days", "Every Other Day", etc.) drifting or desynchronizing between your iPhone and Apple Watch, do not delete your medication or reset your devices-you do not need to lose your past logging history or adherence data.

I ran into this exact issue on my iPhone 14 (iOS 26.6.2) paired with an Apple Watch Series 10 (watchOS 26.3). A medication set to "Every 4 Days" started skipping cycles (leaving 7- and 8-day gaps) and firing out of phase because the background schedule cache got stuck.

You can force HealthKit to immediately recalculate the interval timeline without changing any data using a quick no-op duration save:

1. Open the Health app on your iPhone.
2. Go to Browse > Medications and tap your scheduled medication.
3. Scroll down to the Schedule section and tap Edit.
4. Scroll down to the bottom of the Edit Schedule screen to Duration and tap Edit.
5. On the Edit Duration screen, do not change the Start Date or End Date. Simply tap the blue checkmark (✓) in the top-right corner to save.
6. Tap the checkmark again on the Edit Schedule screen to commit.
7. 
   

Why this works: Saving the duration-even without modifying values-fires an internal CoreData update signal (didSaveNotification). This invalidates the stale scheduled notifications cache, recalculates future intervals starting from your original start date, and pushes a fresh sync packet to your Apple Watch over WatchConnectivity.

Ever since doing this, my reminders snapped back to the exact 4-day cadence and have been alerting properly on my wrist.

If anyone wants to see the visual screenshots of the steps or the underlying architecture breakdown of why the sync drifts, I documented the full write-up here:

https://techvigil.com/apple-health-medication-reminders-out-of-sync-fix/

Hope this saves others from wiping their medication history!

This is happening to me, frustrating to see how long it’s been going on. To fix it I have to go into edit schedule, edit the start date, don’t actually change anything but click the check sign. Then it moves to the correct date. It’s very annoying with several medications set to every other day.

It would be great if I could count on the reminder to be correct. It is difficult to remember when last taken a medication which is scheduled other than every day. The best you can do is log a day when the reminder comes up then open the app the next time you get a reminder and check each medication logged to be sure you logged or did not log the previous days. Basically a pop up reminder to check all your medications 😕

Install new iOS 26.6.2. Running into same issue, what’s wrong with developer, cannot fix a simple issue and prompting new product Apple Watch with health care.

I am having the same issue, have you managed to find anything out yet?

I have memory issues and am worried that I might forget when I last took my every other day meds which are ones that you can overdose on

I'm having the same issue! Glad it's not only me. I have mine set to every 3 days and sometimes it'll remind me 2 days in a row, sometimes every second day, and sometimes not until 4 days! It's very rare that it correctly reminds me on the third day. This option really shouldn't be offered if it's not working as should be

I have the same issue… still hasn’t been fixed as of August 2026.