According to COMDTINST 6710.15D, when should antimotion sickness medications NOT be given?

Antimotion sickness medications should not be administered without medical supervision because these medications can have varying effects on individuals. Proper medical guidance ensures that the medication is appropriate for the specific situation and individual, taking into account factors such as medical history, current health condition, and potential interactions with other medications. This oversight is crucial in preventing adverse reactions and ensuring the safety and well-being of all crewmembers. Administering these medications without guidance could lead to improper usage, which could jeopardize the individual's health and the overall safety of the crew.