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> does anyone here know of any drugs that cause neurogenesis?

Tianeptine is fairly well known[1][2] for being able to prevent and/or reverse changes like hippocampal volume loss, which is commonly seen in untreated depression[3], chronic stress[4] and several other conditions.

7,8-Dihydroxyflavone[5] derivatives and/or prodrugs also look promising[6].

[1] https://www.ncbi.nlm.nih.gov/pubmed/22047727

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4034085/

[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1557684/

[4] https://www.nature.com/articles/srep29127

[5] https://en.wikipedia.org/wiki/7,8-Dihydroxyflavone

[6] https://pubs.acs.org/doi/abs/10.1021/jm101206p

Not a drug, of course, but don't leave physical exercise off your list.

Jon Hopkins university is conducting research on psychedelic. There is a whole universe of medical applications from what I saw but they need more funding to safely prove those.