I wouldn't jump straight to a drug to kick-start your period. If it has stopped, there is likely a reason behind it and you should really find out what that reason is. The lack of period is just a symptom - if you treat the symptom but not the cause (given that the cause CAN be treated), you might be missing the warning signals of something else wrong.
When my cycle went completely off-kilter, it was because my thyroid was going out of control. See your doctor and find out the reason behind it.
Rae (27), DH (26), Lucas (6/3/12), #2 due in December