Drugs period can affect different people in different ways.
There has been quite a bit of media attention in my country on males developing lactating breasts after having taken risperadal.
It's unfortunate, but most drugs will affect some person in some way.
Missed periods can also be affected by diet and exercise, etc.
J
I doubt anyone can accurately answer that -- these drug withdrawals can do just about anything to someone, but if it isn't recorded in the literature somewhere, and where's the money in researching withdrawal, nobody can know. Stress can cause missed periods, and certainly stopping any of these meds causes stress.
Probably not, but sometimes high levels of anxiety has caused missed periods.