All the pheniramine drugs are second generation and have some drowiness and other CNS effects. They can affect the brain because histamine is a signaling neurotransmitter in the brain, to release other neurotransmitters. Also some antihistamines like Benadryl have actions on motor neurons...and are used sometimes for side effects of movement disorders caused by other drugs.
The newer one like Allegra (a metabolite of the old Seldane which was taken off the market), have much less CNS effects if any. Claritin is a poor antihistamine all around so I don't recommend it. Zyrtec has retained some of the characteristics of
its chemical parent Atarax, and has some CNS effects, but not as many as the Atarax has. Both Allegra and Zyrtec are OTC now.
The new allergy nose ointments, block the pollen before it gets into your nose at all...
example:
http://www.amazon.com/Chloraseptic-A.../dp/B001BNQVC6
This is drug free and works well for most.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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