Why does opiate use stop menstruation?

I have been on methadone for medical reasons for three years, and my body failed to have menstruation cycles ones my dose became higher than 50 mg/day. Upon research and visits with my doctor, it was explained to me that some people are more sensitive to narcotics than other, and it can cause their body's estrogen levels to drop. # believe

That is pretty  

Answer its calculated by subtracting your age from 220;