[saltcured]

If concerned about unsafe access to medications, I think putting them in a locked cabinet or room is the best solution rather than thinking that something like a bottle cap is going to control access. Unfortunately, many elderly also suffer cognitive declines which make it risky for them to manage their own medications, even if they are physically capable of the task. Missed doses or accidental double-dosing can potentially lead to other health problems, exacerbating their cognitive struggles and increasing the risk of dosing mistakes.

In the long run, I think that a family providing such support should consider adopting some of the best practices of care staff who do medication management for clients. You want a physical log sheet that is formatted like a 2D matrix with recurring doses as row labels and dates written as column labels. The rows should also be sorted and grouped chronologically, i.e. the first row is the first dose to take after waking and it is ordered through to the last dose to take before bed. You typically also want to leave blank space after each dosing period so you can potentially write in new medications when there are changes ordered during the tracking period. You also want to keep a digital copy of the form that you can easily revise and print again as the forms are filled to completion.

The responsible party measures out the doses and marks/initials the cells of the grid for the individual dose and date being administered. In a professional setting, they might mark once for preparing the doses and once again after witnessing that they were consumed. The active log sheet is kept in the same storage area as the medications, readily accessible to the ones administering them. If there are multiple people taking medications, a separate series of sheets is used for each person.

In a professional setting, this supports audit. But in any setting, it also provides a simple process to help minimize dosing mistakes. There are no more questions like, "wait, did they already take this?" after a distraction has interrupted the normal, habitual process. This written formalism can also help you manage refills. Learn to think in terms of "N days' supply" to note on the grid when a bottle is opened, predict when it will be depleted, and mark down when it should be reordered.