I've been taking atomoxetine 60mg for a few months for my Inattentive ADHD so YMMV
I can still rely on hyperfocus happening, it can happen during the day when the meds are working and in the evening when they've worn off. Though when the meds are working it's a far more productive hyperfocus.
But I have to aim my morning otherwise it ain't gonna happen. Hell if I don't aim my morning on a normal day ain't nothing getting done that day other than memes, YouTube, and other social media.
The night before I'll tell myself multiple times what I need to do in the morning.
I'll leave myself a sticky note on my meds (I'll try at least, I'm not perfect).
In the morning I will take my meds immediately.
I won't open social media of any kind (most important and hardest (yes YouTube counts)).
I will start my playlist on my phone (it's always queued, I just hit play)
I'll start making breakfast.
I'll talk to myself about the task I need to focus on for most of my morning eating (chanting to myself like a madman is most common).
And once I'm done with breakfast and brushing my teeth, I'll sit down to start.
And usually by that point my meds are starting to do their thing and then I'm in go mode.
A day off is best because usually that means the only thing I have to worry about is the day ending.
If you have anymore questions for me feel free to ask.