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- Fri Apr 27, 2012 3:19 pm
- Forum: hay fever and rhinitis
- Topic: One a day antihistamine
- Replies: 5
- Views: 24694
One a day antihistamine
I take cetirizine hydrochloride. One of the widely available one a day antihistamines. I am aware they last around 8 hours, and the instructions are clear that you should take one a day, and not to exceed this dose. My question is, what does it mean by one a day. Is this no more than one in 24 hours...