If none of the options to treat azoospermia works, there exist other alternatives to have children with azoospermia. In cases of obstructive azoospermia, a technique called ICSI (Intracytoplasmic Sperm Injection) can be used with sperm that has been directly collected from the testis, either through testicular biopsy, or epididymal or testicular aspiration.
With non-obstructive/secretory azoospermia, or when ICSI is unsuccessful, sperm donation is the most recommendable option. See also: What Is Sperm Donation?
Suggested for you: Treatment for Non-Obstructive & Obstructive Azoospermia.