<prompt> Most effective agent to prevent motion sickness is-EphedrineNedocromilCyproheptidineHyoscine  <response>: Ans. is d i.e., Hyoscine o Motion sickness is more easily prevented than cured.o Transdermal hyoscine scopolamine is the best agent for the prevention of motion sickness.o Antihistamines can also be used for prevention. 