My doctor told me it is okay for me to take Benadryl Allergy Ultra Tablets since I came down with Shingles. My rash is gone now but the pain of PHN is still there on a daily basis every morning and in the evenings. I have been taking Benadryl for 3 1/2 months now. This makes me drowsy and helps me to sleep at night. But I am very concerned now if it can make you addicted to it. Please any advice would be very helpful.