Longworth wrote:

We always pack Benadryl for our dive trips and
take it only at night, never during the day time, and at least 12 hours
before the next dive. However, for flying both Rick ad I draw the
limit of not taking Benadryl at least 24 hrs before acting as PIC.

Pseudoephedrine hydrochloride works better for PIC. Take it about 1 hour before
the flight.

George Patterson
Drink is the curse of the land. It makes you quarrel with your neighbor.
It makes you shoot at your landlord. And it makes you miss him.