The uses of FINCAR include: Fincar treating urinary problems caused by an enlarged prostate gland (benign prostatic hyperplasia, BPH). It is also used to lower the risk of needing surgery to treat BPH. It may be used with another medicine (doxazosin) to lower the risk of worsening BPH. Fincar is a type of steroid reductase inhibitor. It works by reducing the amount of the hormone dihydrotestosterone (DHT) in the body. This makes the prostate gland smaller, which helps to relieve urinary problems.