amoxicillin i think, some penicillin derivate.
But Iam quite sure that it only somewhat boosted the positive effects from vyvanse. It took probaly a month or so for vyvanse to work, it was getting worse at the start too, especially the erection quality. Stimulants are kown to cause vasoconstriction.
My opinion is that PFS isnt about common androgens but about neurosteroids. I think finasteride or isotretinoin can cause neurological damage to some of the pathways that regulate hormones and stuff in the brain. Amfetamines are known to affect sex drive but dont increase testosterone directly.