One might hope so. But unfortunately, hydrocodone (even if abused) will probably not change his sperm count.
Oh lord no! Now that being said' there is not anything that can keep you from getting pregnant other than lack of sex. I have known some major pill heads and over the course of the years and hard core use a guys fertiliy rate can lower and some even sterile but that's few and far between. Now when the guys fertility rate drops most of the time after anywhere from a cpl months to a cpl yyears of sobriety hIs sterility rate lowers and he becomes more fertile again.... This is from research I have done-