Question

If 100 mg drug is administered and has a half life of 6 hours, the percentage of the drug that will be in the system is 18 hours. a. Trueb. False

Answer 1

Answer:

Kindly check explanation as the question seems incomplete but the explanation should help.

Explanation:

Given the following :

Initial dosage of drug = 100mg

Halflife of drug = 6hours

After 18 hours, the percentage of drug that will be in the system should be :

Half-life is the time taken for a material to reduce to half of it's initial size.

Since half life = 6 hours

After 6 hours ; amount left = 100/2 = 50 mg

After 12 hours ; amount left = 50/2 = 25mg

After 18 hours ; amount left = 25/2 = 12.5mg

Hence, after 18 hours percentage left in system :

(Amount left / total initial amount) × 100%

(12.5 / 100) × 100%

0.125 × 100%

= 12.5%