Prescriptions may disappear for a few reasons:
1) The script may be hidden.
To unhide the script, go to your prescription list, tap the icon with 3 bars and an arrow on the top right hand side of your screen, and choose Unhide prescriptions from the pop up list.
2) Your script may be expired or have 0 refills left.
The system hides expired or 0 refills left prescriptions after a year. If you call the pharmacy, they should still have it on file and can give you the information.
You can change your hide/unhide settings by going to Account and toggling the Hide expired prescriptions and Hide zero refill prescriptions on or off.
3) Your script may be in a pending status.
For instance, it may have been sent to the doctor for approval or be under review by the pharmacy. In these situations, if you wait for a period of time, the script should show up again in your list. If you have concerns, please call the pharmacy to check on the script.