Yes, a huge PSA drop is typical; mine dropped 99.8%. I had two 3-month injections of Eligard; the Eligard lingered in my system for an additional 3 months.

The purpose of Lupron (and the other androgen deprivation therapies) is to starve and weaken prostate cancers by depriving them of their food source (testosterone), weakening them, and resulting in PSA dropping to undetectable if possible; my PSA went as low as < 0.008 ng/mL.
> how low is your testosterone?

The purpose of Erleada (and the other androgen receptor pathway inhibitors) is to prevent testosterone from binding to androgen receptors.

Now that your PSA is being suppressed, what treatments do you have planned to kill the remaining prostate cancers?