Case 3 A 5-year-old child who weighs 55 lb is suffering from an infection. He was ordered Pathocil (Dicloxacillin Sodium) 125 mg P.O. q. 6 h . The recommended dosage of Pathocil for children weighing less than 40 kg is \( 12.5-25 \mathrm{mg} / \mathrm{kg} / \) day P.O in equally divided doses q .6 h for moderate to severe infections. Calculate the following - Recommended minimum daily dosage for this child:. \( \qquad \) .mg/day - Recommended minimum single dosage for this child: \( \qquad \) .mg/dose - Recommended maximum daily dosage for this child: \( \qquad \) mg/day - Recommended maximum single dosage for this child: - Decide if the dose is safe or not ? .mg/dose

To calculate the dosages for the child, we'll use the weight of the child (55 lb), convert it to kg, and then calculate the recommended dosages based on the provided information. 1. **Convert weight:** \( 55 \text{ lb} \div 2.2 \text{ lb/kg} \approx 25 \text{ kg} \) 2. **Recommended minimum daily dosage:** Minimum dosage: \( 12.5 \text{ mg/kg/day} \) \( 12.5 \text{ mg/kg} \times 25 \text{ kg} = 312.5 \text{ mg/day} \) 3. **Recommended minimum single dosage:** This is the minimum daily dosage divided by the number of doses per day (4 doses). \( 312.5 \text{ mg/day} \div 4 \text{ doses/day} = 78.125 \text{ mg/dose} \) 4. **Recommended maximum daily dosage:** Maximum dosage: \( 25 \text{ mg/kg/day} \) \( 25 \text{ mg/kg} \times 25 \text{ kg} = 625 \text{ mg/day} \) 5. **Recommended maximum single dosage:** This is the maximum daily dosage divided by the number of doses per day (4 doses). \( 625 \text{ mg/day} \div 4 \text{ doses/day} = 156.25 \text{ mg/dose} \) 6. **Decide if the dose is safe or not:** The ordered dose is 125 mg/dose. - Minimum: 78.125 mg/dose - Maximum: 156.25 mg/dose Since 125 mg/dose is within the safe range (between 78.125 mg and 156.25 mg), the dose is **safe**. - Recommended minimum daily dosage for this child: **312.5 mg/day** - Recommended minimum single dosage for this child: **78.125 mg/dose** - Recommended maximum daily dosage for this child: **625 mg/day** - Recommended maximum single dosage for this child: **156.25 mg/dose** - The dose is safe: **Yes, 125 mg/dose** is safe.