The height of a child is 80cm and the weight is 15kg. The usual adult dose of Amitriptyline is 75mg/day. What would be the dose for the child based on body surface area (BSA)

1 answer

To calculate the dose of Amitriptyline for the child based on body surface area (BSA), we can use the following formula:

BSA (m²) = (√(Height (cm) x Weight (kg)) ÷ 3600

First, let's calculate the body surface area (BSA) of the child:

BSA = (√(80 cm x 15 kg)) ÷ 3600
= (√(1200)) ÷ 3600
= (√(1200)) ÷ (60 x 60)
= (√(1200)) ÷ (3600)
≈ 0.0585 m²

Now, we can determine the dose for the child based on the usual adult dose per square meter (mg/m²).

Child's dose = BSA x Adult dose
= 0.0585 m² x 75 mg/day
≈ 4.3875 mg/day

Therefore, the estimated dose of Amitriptyline for the child based on body surface area (BSA) would be approximately 4.3875 mg/day.