The chemical nepetalactone is to credit for your kitty's crazy reaction to catnip. The chemical, which is a mild hallucinogen, doesn't affect humans in the same sense as we do not rely as heavily on our noses as cats do. In fact, it doesn't even affect all cats.
Finasteride is a drug that belongs to the class of androgen inhibitors, which means that it blocks the production of male sex hormones. It is sold in the United States and Canada under the brand names Proscar and Propecia.
The PSA levels in men taking finasteride for the treatment of benign prostate enlargement usually decrease by 30% to 70% after one year and even more after more prolonged treatment. The theoretic basis for using finasteride to prevent prostate cancer is that almost all prostate cancer cells are responsive to male hormones (androgens).