We have a rule about posting hormone doses. Not allowed.
Getting back to your original question, yes, Finasteride can cause emotional depression. The high dose is for prostate conditions and the low dose is for hair loss. The low dose may help reduce the depression as compared to the high dose.
It works by blocking the conversion of T into DHT. By blocking the production of DHT, you should stop losing hair, but as for restoring hair, many people report only limited results.