It is now mostly replaced by more precise terms. In men, inappropriately high levels of estrogens lower testosterone, decrease muscle mass, stunt growth in teenagers, introduce gynecomastia, increase feminine characteristics, and decrease susceptibility to prostate cancer, reduces libido and causes erectile dysfunction and can cause excessive sweating and hot flushes. The potential for selective phosphodiesterase inhibitors as therapeutic agents was predicted as early as 1977 by weiss and hait. Phentermine 37.5 without prescription overnight: research university carnegie foundation.