Post nasal drip: Humidification (humidifier/vaporizer) plus saline nasal spray will help flush allergens out. Different antihistamines work better for different people. Claritin less likely to cause drowsiness but not approved for under 6 y/o; zyrtec ok 4 her age; use proper dose. Another choice is benadryl(but drowsiness much more likely). If not better, see peds.
Answered 1/10/2017
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Consider reflux: Gastric reflux commonly causes a sense of post nasal drip so that throat clear is common. Consider antacid trial. If antihistamines don't work consider nasal steroid sprays.
Answered 4/9/2013
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