Upvote:4
Yes, you are allowed to go to the Dominican Republic. To re-enter the US, though, you need a valid F-1 visa. If your visa has expired, you have two options:
If your trip to the Dominican Republic is 30 days or shorter, you may be able to use automatic revalidation.
If your trip to the Dominican Republic is longer than 30 days, or if you cannot use automatic revalidation for some other reason, you can apply for a new F-1 visa at the US embassy in Santo Domingo.