UPDATE – we now use this dosing calculator
(but we have left the old chart below for reference)
Keflex
(must be > 2 months old)
DOSE
• 25 – 50 mg/kg/day (11 – 46 mg/lb/day) in divided doses every 6 hours
• Do not exceed 4 gm/day
• For skin and soft tissue infections, may give every 12 hours
• The usual course of therapy is 10 days
Table for Maximum Dosage (of 50mg/kg/day):
| WEIGHT | DOSE (given every 6 hours) | ||
|---|---|---|---|
| (LB) | (Kg) | 125 mg/5 ml | 250 mg/5 ml |
| 11 | 5 | 1/2 tsp | 1/4 tsp |
| 22 | 10 | 1 tsp | 1/2 tsp |
| 33 | 15 | 1 1/2 tsp | 3/4 tsp |
| 44 | 20 | 2 tsp | 1 tsp (250 mg cap) |
| 66 | 30 | – | 1 1/2 tsp |
| 88+ | 40+ | – | 2 tsp (500 mg cap) |
SUPPLIED
SUSPENSION: 125 mg/5 ml, 250 mg/5 ml – 100 ml & 200 ml, flavored.
Disclaimer: All of the information on this website is being presented as helpful reference material but should not be considered authoritative. There are no references because the information has been collected over the years piecemeal from notes, lectures, journals, textbooks, personal communications with other physicians and experience. You may disagree with some of it. Take it simply for what it is: information that I have found useful in my day to day practice as a clinical dermatologist and my hope is that you find it useful as well.
