Hello susanfromblanchard,
Are you referring to the medication schedule? If so, this feature might not be available in all countries or regions. For help with the feature check the information below, found in the guide here: Track your medications in Health on iPhone - Apple Support
"Add and schedule a new medication
- Tap Browse at the bottom right, then tap Medications.
- Tap Add a Medication (to start your list) or Add Medication (to add to your list).
- To identify the medication, do one of the following:
- Type the name: Tap the text field, enter the name, then tap Add.
- In the U.S. only, suggestions appear as you begin typing. You can select a suggestion, or finish typing the name, then tap Add.
- Use the camera: (U.S. only; on supported models) Tap
next to the text field, then follow the onscreen instructions.- If a match isn’t found, tap Search by Name, then type the name (as described above).
4.Follow the onscreen instructions to optionally create a custom visual of the medication and to optionally set a schedule.
When you set a schedule, you receive notifications from Health reminding you to log the medication."
If you're referring to normal alarms that are set, be sure your location service and automatic time zone settings are correct to receive notifications as expected.
Turn Location Services and GPS on or off on your iPhone, iPad, or iPod touch - Apple Support
If you can't change the time or time zone on your Apple device - Apple Support
Cheers.