Can Domperidone stop being effective?

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Hi Ladies, I was put on Domperidone at the beginning of June and my milk production became really good. I pump every night before bed and freeze the extra. It got to such a point that I ended up donating 243 oz because my freezer was bursting becuase I was pumping almost 8 ouncesa night. Now a little more than a month later my milk production has plummeted. Worse than it has ever been. I am determined to make it to 1 year breastfeeding. Baby girl is just over 7 months

Has anyone had Domperidone stop heing effective? Were you able to get ypur supply back? And how? I find it difficult to find time during the day to pump. Baby is napping now so I am trying to power pump.