Some adhd meds are like that too, however. I don’t think they are the stimulants, though. For example, straterra/atomoxetine (an sNRI), guanfacine, and clonidine, can take weeks to work:
It is important to note that the treatment effects are not usually observed until several weeks after initiation of treatment with atomoxetine (6–12 weeks), clonidine and guanfacine (2–4 weeks) (Childress, 2016; Dickson et al., 2011; Sallee, Kollins, & Wigal, 2012). This differs significantly from stimulants, which have a much more rapid onset of treatment effects
Some adhd meds are like that too, however. I don’t think they are the stimulants, though. For example, straterra/atomoxetine (an sNRI), guanfacine, and clonidine, can take weeks to work:
[from this review](https://www.sciencedirect.com/science/article/pii/S016372582100142X?via%3Dihub)
(not very well read here, don’t be too confident in my claims).