The effect of D-ser (TBU)6-LH-RH-EA10 upon gonadotropin release in normally cyclic women.

D-Ser (TBU)6-LH-RH-EA10 (HOE 766) was found to be approximately 40-times as effective as LH-RH in stimulating LH and FSH release in normally cyclic women. The most pronounced reaction was seen in the late follicular phase, the least one in the early follicular phase. Maximal serum gonadotropin levels were found 4 h after the injection of HOE 766. When 5 microgram was injected every 8 h for 3 days, the initially high release of LH and FSH declined progressively to almost nil.