4 weeks pregnant abroad. i can get misoprostol over-the-counter & i have read oral is not as effective as vaginal, but is it safe to take vaginally?

Oral NOT effective: Misoprostol for termination is safe within certain limits: it is usually used in combination with another medicine to maximize efficiency, and REALLY should be done under a doctor's care to avoid possible complications. We cannot prescribe or treat on HeathTap; I'd strongly caution you against doing this without professional help. Very best wishes.