Oral Contraceptive Pills
Such as: Loestrin, Alesse
Birth control pills are pretty safe except for the increased risk of blood clotting—about four times that of the general population. Women who have just finished a long event and then jump on a plane before rehydrating have a higher clotting risk (this is a good time for a prophylactic NSAID or aspirin). Reduce the risk of a post-event blood clot through effective rehydration.