If you can't get finasteride/dutasteride or pyrilutramide, or you don't want to take it, there is a natural alternative. Piperine, the main consistuent of black pepper, is a strong 5,alpha-reductase inhibitor, which just like finasteride blocks the conversion of testosterone into dihydrotestosterone, the main cause of male pattern balding.
Of course this means you have to take it every day. You can buy the extract or pure piperine as a supplement. Or you can eat a spoonful of black pepper every day.
>Testosterone 5alpha-reductase inhibitory active constituents of Piper nigrum leafhttps://pubmed.ncbi.nlm.nih.gov/18057734/>Previously we reported that Piper nigrum leaf extract showed a potent stimulation effect on melanogenesis and that (-)-cubebin (1) and (-)-3,4-dimethoxy-3,4-desmethylenedioxycubebin (2) were isolated as active constituents. As a part of our continuous studies on Piper species for the development of cosmetic hair-care agents, testosterone 5alpha-reductase inhibitory activity of aqueous ethanolic extracts obtained from several different parts of six Piper species, namely Piper nigrum, P. methysticum, P. betle, P. kadsura, P. longum, and P. cubeba, were examined. Among them, the extracts of P. nigrum leaf, P. nigrum fruit and P. cubeba fruit showed potent inhibitory activity.>P. nigrum fruit showed potent inhibitory activity.full page pdf:
https://www.jstage.jst.go.jp/article/bpb/30/12/30_12_2402/_pdf/-char/en 