I second having benadryl and aspirin in a hiking FAK. Benadryl can make you drowsy - it's often given to people who are going to, for example, be settling in for a several hour chemotherapy session (first hand experience on that). But in a hiking/emergency situation, the effect would be virtually non-existent, since the user is likely to be amped up.
I know that myself, when I take it I cannot fiht the effect. My wife has many times tried to wake me up too and couldn't. I've since changed and only take a half dose at night but still have a hard time fighting the effect when it kicks in. I don't think I'd be able to fight it in an emergency situation.
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