Ask your wife why she is so set against medication?

If she is embarrased, who needs to know?

Let her know you take them not just for yourself but her and your family's sakes as well.

(my favourite) Point out to her there is no award for not taking the medication. There is no medal for fighting mental illness medication-free

Great idea already mentioned about taking her with you to an appointment.

Finally just what might actually be bothering her; the medication issue or perhaps the fact that you now hvae a label? Is that what she is really struggling with. Taking medication only confirms for her that your illness is real.