I appreciate your query.
, which is now accepted as a tocolytic
( drug which inhibits uterine contractions ).
Since you are travelling, and your gynecologist must have tried to eliminate all possibility of a preterm labour or a miscarriage
at 20 weeks, she must have prescribed it to you.
It is scientifically proven to be a good tocolytic agent.
You can safely take it for the two weeks that you have been prescribed.
Hope this helps you.