Hello and thank you for your question. I’d be happy to assist you.
I understand your concern.
Diazepam has a relatively long half life...it does not leave your system quickly, so you take your 5 mg 30 minutes before the flight.
You can take other 5 mg dose after 4 hours or at bed time.
It's not recommended to exceed your dose above 10 mg.
And it's usually advised to take it for short term use.
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