Hi - I would like to add that for me personally taking Claritin 1x daily did the trick to eliminate itching and subsequent dermatographism. I weaned myself to once every other and then once every two days. I did this over a month period and finally got off it completely. It took about 7-9 days for any itching to reappear and 10 days for the severe itching and subsequent dermatographism to reappear. I have been dealing with this since the new year after getting the booster end of December ‘21.