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- Discussion: 
- expectorant & cough supression; 
- syrup:10ml dose; 5 ml = 100mg guiafenesin/15mg dextromethorphan; 
- Peds: >12 yrs: same as adult; 6-11 yrs: 100-200 mg (5-10ml) PO q4hr; 2-5 yrs: 50-100 mg (2.5-5 ml) PO q4hr; Supplied: Tabs: 100mg, 200mg; Caps: 200mg; Syrup 67 mg/5ml, 100 mg/ml