DD has chickenpox and is covered in spots, poor thing. We had a bad night last night with itching keeping her awake so tonight I have given 2.5ml of Piriton before bed, at about 7:30pm. She also had some before her afternoon sleep at about 12:30. So I don't think I can give her anymore tonight. What i was wondering was if I could give her Medised if she wakes up tonight to help her sleep (because the antihistamine stops scratching and not because I want to drug her!!!) The active ingredients are different and she hasn't had any calpol at all today. Any thoughts? I don't want to overdose her on anti-histamine!