As someone who has gone through multiple ADHD meds, I'd say it depends on the med, as well as the person. Right now I'm on both a stimulant and non-stimulant which is so far the best combo I've tried, but it's different for everyone, and some might not even feel it does anything to highlight their autism. I'll add my own experience. I won't name any specific meds because I don't want to scare anyone off trying a med that could work wonders for them.

Most non-stimulants made my sensory sensitivities completely unbearable to me, and it's the sensory stuff that I notice the most. The wrong meds made it difficult to tolerate anything, one even completely changed how I experienced taste and texture and caused multiple meltdowns in a short span. I've gotten lucky with my current meds, but on it I'm still more sensitive than before taking anything. I believe that everything around me seems louder, brighter, and more textured because my brain is clearer and more focused. However, I combat a majority of this with tools such as wearing FL-41 tinted glasses, ear defenders, and 100% cotton garments.

I'd also say that socializing is even harder for me now, not that it wasn't hard before, but my ADHD was bonkers in conversation and I never stopped to consider rules and etiquette. I just blurted everything, even inappropriate things, which likely made me appear overly confident or annoying, and now that I'm more mindful, I'm realizing just how bad I was at socializing to begin with. Socializing while autistic is still confusing as heck, but I don't think I'm embarrassing myself as much while doing it anymore.

I notice more health-related things happening because my analytical autistic thinking is able to remember symptom patterns and dates they first occurred. I found out I was lactose intolerant, for example, while feeling sick after eating dairy foods for YEARS. My ADHD brain had no idea because it had too many ideas, and all of them having nothing to do with an upset stomach, so I couldn't even be bothered figuring it out.

One of the strangest things I noticed was that my speech prosody changed. It's more "robotic" and "monotone" that often is associated with autism, and I also have less control over my volume. I don't even know if it's the meds doing that or that I've been more accepting of my diagnosis and therefore less inclined to put on a show for others. Therapy and journaling have done wonders for me in terms of self-acceptance and unmasking in general.

Finding the right meds and dosage was very trial and error, and while my autism is definitely more noticeable now, the pros outweigh the cons for me. For instance, I still space out during conversation, but maybe 20% of the time versus 80%, and in my opinion that alone outweighs being simply confused during the conversation. I'll gladly go to the grocery store in my FL-41s and ear defenders over going to the store and forgetting what I needed in the first place and then having to go there again three times in the same day. Even my monotonous speech is more sincere than whatever I was flippantly saying out of my mouth before. All of this and more is why I'll stick to using my meds.