My feeling is you should have told F you were concerned about the meds and have F express any such concern to his therapist, if so desired. I know you have training. However, F is an adult. I would be mad if my husband went to my T behind my back or called my T and talked on the phone about me. My husband's T won't even allow me to come into a therapy session with my husband! (Makes me wonder what my hubby has said about me!

)
I know you meant well, but I think maybe you did overstep your boundaries, assuming F is an adult who is legally able to make his own medical decisions. I think it would have been appropriate, though, for Tony to have said, "Yes, I'll talk to you, but remember I will tell F anything you say, if I think I should."
Given my thinking, I am hard-pressed to select any of the options in the poll!