did your first dose of meftal spas
help relieve the pain. If yes then there is no harm in taking another dose after 6 hours. try also to take a hot water bag to soothe the lower abdominal area.
only if you think that your period pain
is worse than normal and if the tablet is not relieving it then i think you need to go see a gynecologist to find if there is any other reason for the pain.