Ronald Blum of the AP identifies Manny’s drug as HCG, human chorionic gonadotropin.

HCG is prescribed to stimulate female fertility and testosterone production in men and to treat delayed puberty in boys.

Since I don’t think Manny wants to get pregnant, that’s a long time to wait to do something about puberty.

“It’s not infrequently part of the mix of the poly-drug approach to doping,” said Dr. Gary Wadler, chairman of the committee that determines the banned-substances list for the World Anti-Doping Agency. “It typically is used most when people are coming off a cycle to restore to normal biophysiological feedback mechanisms.”

That certainly makes it seem suspicious. According to this Wikipedia article, it is used as a fertility treatment in men. It also appears to be used off label for weight loss.