We would advise using a GnRH (Gonadotropin Releasing Hormone) agonist. GnRH agonists are our "gold standard" blockers, more commonly known as puberty blockers. They are the most effective blocking medications, but need to be given by injection by a professional, or by a daily nasal spray.
GnRH agonists are typically the most well tolerated blocking medications and are the first choice, although they are more expensive.
You can find the Patient Information Leaflet for Decapeptyl (Triptorelin) injections here.
You can find the Patient Information Leaflet for Synarel nasal spray here.