Jetzone jet lag prevention tablets are a homeopathic travel medicine for temporary relief from the disruptions in circadian rhythms and fatigue associated with jet lag from flying. This can also help with symptoms of insomnia, exhaustion, irritability and anxiety. Adults and children over 6 years chew one tablet up to one hour prior to every takeoff. Also chew one tablet approximately every 2 hours and one within 1 hour of each landing. Each bottle contains 30 all-natural chewable tablets.