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Cetirizine (Zyrtec) dosing:

Dosing is one daily.
Comes as:   liquid 5mg/5ml, 5mg chew, 10mg tab
2-6yrs:     2.5ml
6-12yrs:   5ml  or   5mg chew tab
12yrs+:    10ml  or  10mg tab

Loratadine (Claritin) dosing:

Dosing is once daily.
Comes as:  liquid 5mg/5ml ,5mg chew, 10mg tab
2-6yrs:      2.5ml
6-12yrs:    5ml or 5mg chew tab
12yrs+:     10ml  or 10mg tab

Fexofenadine (Allegra) dosing:

Dosing is twice daily except for the 180mg dose (once daily).
Comes as:  liquid 30mg/5ml,  30mg tab,  60mg tab,  180mg tab
6mo-2yr:      2.5ml (for hives only)
2-6yrs:          5ml
6-11yrs:        5ml  or  30mg tab
12yrs+:        10ml  or   60mg tab  or   180mg tab (once daily)

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