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can be due to many causes like infective,obstructive so it is important to find the cause.
The line of treatment will depend upon the cause.There are few things you can do like:-
and alcohol in case you are taking it,
-avoid working in placeswhere it is warm,
-you can get a antioxidant prescribed from your doctor.
The better option will be to consult a Urologist
and get evaluated for the cause of azoospermia and he will do the needful.