How to Calculate Cephalexin 250 mg/5 mL (suspension) Dose

This calculator determines the Cephalexin dose for treating bacterial infections, using a concentration of Cephalexin 250 mg/5 mL (50 mg/mL), based on the patient’s weight and dosage regimen:

Dose in mg and Volume in mL (based on Cephalexin component):

Volume Calculation:

Where:

• Weight: Patient’s weight in kilograms (minimum ~5 kg for pediatric ≥ 1 month).
• Dosage Regimen: Select between mild to moderate infection (TID or QID) or severe infection (QID or Q6H).
• Concentration: Cephalexin 50 mg/mL (250 mg/5 mL).

For adults, the usual dose is 250 to 500 mg PO Q6H (Max 4 g/day). Administer for 7–10 days, or as directed. ⚠️ Always consult a healthcare provider.

Using the Cephalexin 250 mg/5 mL (suspension) Dosage Calculator

Enter the patient’s weight, select the dosage regimen (mild to moderate infection TID/QID or severe infection QID/Q6H). The calculator provides the minimum and maximum dose in mL and mg per dose for pediatric patients (≥ 1 month) or adults.

Example: Weight 12 kg, Mild to moderate infection QID:

Pediatric ≥ 1 month:
Min Dose: 1.5 mL (75 mg) PO QID
Max Dose: 3 mL (150 mg) PO QID

Adults:
Usual dose is 250 to 500 mg PO Q6H (Max 4 g/day)

Calculations must be re-checked and should not be used alone...
            

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is Cephalexin used for?

Cephalexin (Keflex; Ceporex; Cepol) treats bacterial infections, including skin infections, respiratory infections, and urinary tract infections.

2. How often is this given?

Pediatric: TID, QID, or Q6H, depending on the infection severity (25 to 100 mg/kg/day). Adults: Every 6 hours, 250 to 500 mg PO Q6H (Max 4 g/day).

3. Can this be used for infants under 1 month?

Consult a doctor, as Cephalexin (Keflex; Ceporex; Cepol) is not typically recommended for infants under 1 month without medical supervision.

4. What if weight is in pounds?

This calculator accepts only kilograms, but you can convert pounds to kilograms (1 lb = 0.4536 kg) before entering the weight.

5. What’s the adult dose?

Usual dose is 250 to 500 mg PO Q6H (Max 4 g/day).