Neuroprotection with regards to anabolic steroid use. I just learned about how Alzheimer's patients are given cholinesterase inhibitors and something called memantine to stabilize or slow down the disease.
Wait weren't you just talking about memory? Alzheimer's and memantine is something completely different. Memantine is usually not found to be particularly good for long term memory in non alzheimer/dementia patients. I can't remember why exactly, but I think it's probably bc of it's specificity for the GluN2b subunit of the NMDA receptors which are important for LTP. But don't quote me on that. NMDAR antagonists are, however, never good for memory, as the glutamate system is an intrinsic part in LTP. Memantine prevents excess glutamate signaling excitotoxicity, it has little to do with ACh, for that, donapezil is usually used.
I don't see donapezil being particularly useful for aas use, memantine might be more useful, due to aas and their relationship to excitation. I think SSRI's are a good way of helping with aas use, as they help in multiple ways, which are important for aas depression. They lower proinflammatory cytokines, lower HPA activity, restore hippocampus volume, they also lower striatal dopamine, which might be helpful, if nothing else, as a mood stabilizing effect while on aas - stuff like newer atypical antipsychotics (aripiprazole, cariprazine ... ) might also be helpful on this front as they are partial dopamine agonist.
Otherwise anything that generally lowers brain inflammatory markers should help and you have a plethora of options here. But I'd look at your own physiology first, if you have any problems, GAD, MDD, ADHD, etc. Lowering HPA axis would be my first choice if entering aas use with any such condition. But as I general rule of thumb, I'd just disadvise using aas for anybody who suffers with ADHD, GAD, PTSD, etc. in the first place (not talking about trt here).