Hi there,
Some cats can be very sensitive to benedryl. Use chlor-trimeton:
http://www.petplace.com/drug-library/chlorpheniramine-maleate-chlor-trimeton/page1.aspx
One quarter tablet every 12 hours.
Please reply with more info so we can discuss this further.
Kind regards,
Terri
Feline Healthcare Expert
Expert in feline health and behavior. 20 years experience with cats.