HI, thanks for using healthcare magic
You may be referring to the depo provera
injection. Yes, this can be safely used for a year, some persons use it for longer.
Many women who use this form of contraception
would notice that they may experience reduced or no menstrual bleeding during this time. There may be some episodes of breakthrough bleeding
which is occasional spotting but this tends to resolve as the medication is continued.
When you decide you wish to conceive you can discontinue the medications and your cycles would return.
I hope this helps