Hello Rupes, I'm pleased for you that finally you have an AD that works for you, however, if you left them behind, then it's possible, like I've found out myself, that you can quickly fall back to where you were you.
If this does happen then you should visit a pharmacy where you are, explain the situation and ask them to contact your current pharmacy and ask them to OK a script so you don't have to miss out on taking them.
All the formalities will be handled between the pharmacies and another option is to make sure you carry your script with you everywhere you go, plus the phone number of your pharmacy.
To answer your question, is you need to take this medication until your doctor feels it's time to cut down, but only by them, although I'm not a doctor.
Don't struggle when there are other options for your health and please take care.
Geoff.