the effect of two different h2-receptor antagonists , nizatidine and cimetidine , on sperm counts and hypothalamic-pituitary-gonadal function as determined by responses to provocative gonadotropin releasing factor , gnrh , thyrotropin releasing factor , trh , and clomiphene were compared to those of men receiving placebo medication .
C2757005
h2-receptor antagonists
C0085154
nizatidine