Does anyone feel like caffeine reduces Vyvanse’s effectiveness?

Whenever i take caffeine along with my Vyvanse, seeking an enhanced effect, i end up having weaker than normal effects. And i also feel fatigued earlier than usual.

I took my normal Vyvanse dose + 200mg of caffeine today and i’m coming from a 5-day holiday, which normally will make the effects very strong. But it didnt happen. I didnt feel the drive i normally feel on it.

I suspect that for some reason caffeine is messing with my dopamine signaling in a weird way. Vyvanse, a stimulant, makes me very social and talkative, but caffeine apparently makes me more introverted, like i want to focus more on task execution.