nice find;
"These data, together with promotion of viability of DP cells and upregulation of growth factors such as IGF-1, HGF, VEGF, and KGF, suggest that tianeptine or its derivatives may have potential for treating and preventing hair loss by regulating human hair cycling."
what's surprising is I see some people using the drug on few forums as antidepressant (oral obv) : they
speak of hair thinning. So maybe it could depends on dose and way of delievering it. like you say topical.. that said I doubt people have already tried this angle for male pattern baldness, because we know nothing about it; side effect, long run efficiency(or does it make things worse)... etc .russian roulette.
other study https://www.ncbi.nlm.nih.gov/pubmed/23581888