POSOLOGY
Posology
Posology is a branch of medicine which deals with doses or quantity of drugs which can be administered to produce the required pharmacological actions.
Ex:
1. Paracetamol:
Maximum daily dose upto 4grams.
Route of administration – orally in divided doses.
Use – Anti-pyretic
2. Ampicillin:
Maximum daily dose -1 to 6grams
Route of administration -Oral daily in divided doses.
Use: Broad spectrum antibiotic
3. BCG Vaccine:
Single Dose -0.1ml
Route of administration -Prophylactic by intra muscular
Category -Active immunizing agent
Formulae to calculate children dose:
Response of drugs may vary from one patient to another patient. The dose for children can be calculated from the adult dose by using age, Body weight and surface area. Infants require lesser dose than the adult.
I. Depending on age:
a) Young’s formula:
Child‘s dose = Age in years X adult dose
Age in years +12
This formula is suitable to calculate the dose for a child below 12 years.
b) Dilling’s formula:
Child dose = Age in years X adult dose
20
This formula is suitable to calculate the dose for a child between 12 to 20 years.
c) Fried’s formula:
Child dose = Age in months X adult dose
150
This formula is suitable to calculate the dose for infants.
II. Depending of body weight:
Clark’s formula
Childs’s dose = Weight in pounds X adult dose
150
III. Based on surface area:
Child dose = Body surface area of child X Adult dose
Body surface area of an adult
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