text: what would happen if i over take claritin? i'm taking claritin for my histeric hives which suggests to take only 1 tablet (anti-histamin 10mg) in 24 hours but i've taken 6 tablets already in 24 hours and now i need to take one more since itchness comes up again and hives come to even my face.  i'm on steroid and got prescription of benadryl but refused to take benadryl since it makes me way too sleepy and take claritin instead. but itchness comes back per 3~4 hours so had to take them pretty often then made me to take 6 tablets a day which is 6 times more than i should take.  i'm worry about over-dose effect and side effect. my doc said a shot works as same as taking pills but should i go back to the doc to ask a shot no matter what??  thank you all in advance ;-) there is a reason that the box says to only take 1 per 24 hours.  the drug builds up in your system and you can't clean it out that quickly.  you will make yourself sick if you keep overdosing on the stuff.  i suggest you go to the doctor and listen to what he says    follow the instructions on medicine because there have been tests done to know what is a safe dose.