methods for increasing the endogenous production or release of growth hormone in a human or other animal especially dogs, cats and horses, which comprise administering effective amounts of a compound of Formula I and a growth hormone secretagogue selected from the group consisting of GHRP-6, Hexarelin, GHRP-1, growth hormone releasing factor (GRF), IGF-1, IGF-2 and B-HT920 or an analog thereof;