A little late to the response but..
Many meds fall into 1 teaspoon per 10 or 20 mg/kg

125/5 and 250/5 are supposed to be q 8 hour doses but I have seen ERs do q 12
Thus you are left with 400/5 (or 600/5 as well with augmentin)
dosing is 25-50 mg/kg/dose (amox, sl lower with augmentin)
This will roughly equal 1 teaspoon(5mL) per 10 kg / dose (40mg/kg)

acetaminophen (160/5) dosing is 10-15 mg per dose so 3-4 mL/10kg
(or for > 24# 1 tsp/10 kg multiples (1.5 for 36#)) (or 1 tsp per 12kg)

Ibuprofen (100/5) is 5-10 mg/kg so again 1 teaspoon (5ml) per 10 Kg

azithromycin 10mg/kg day 1 and 5mg/kg day 2-5 The most common formulation is 200mg/kg or
1 teaspoon per 20 kg

There are exceptions to this, of course but I have found this the easiest way to calculate drug doses

Wendell
Pediatrician in Chicago

The patient's expectation is that you have all the answers, sometimes they just don't like the answer you have for them