The client is ordered to receive 40 mg of atorvastatin PO daily. In the medication cabinet, you find 10 mg tablets. How many tablets will you administer to the client? (Enter a numerical value only)

Here's the process for calculating the drug concentration after multiple half-lives:

First half-life: After 1 half-life, 50% of the original dose remains in the body.

200 mg x 0.50 = 100 mg remains after 1 half-life.

Second half-life: After 2 half-lives, 50% of the remaining drug will be eliminated.

100 mg x 0.50 = 50 mg remains after 2 half-lives.

Third half-life: After 3 half-lives, 50% of the remaining drug will be eliminated again.

50 mg x 0.50 = 25 mg remains after 3 half-lives.

Fourth half-life: After 4 half-lives, 50% of the remaining drug will be eliminated once more.

25 mg x 0.50 = 12.5 mg remains after 4 half-lives.

Now, we need to sum up the amount of drug remaining in the body at each half-life:

After 4 half-lives, there are 12.5 mg left from the original dose.

Total drug in the body after 4 half-lives = 200 mg - 12.5 mg = 375 mg.

A) Shake bottle well, pull ear outward and downward, instill drops: This method is typically used for younger children, such as infants or toddlers, as the ear canal in younger children is more horizontal. However, this is not the appropriate method for a 12-year-old.

B) Shake bottle well, pull ear outward and upward, instill drops: This method is incorrect because the ear should be pulled outward and upward for a child under 3 years old, not for a 12-year-old.

C) Warm bottle in hand, pull ear outward and upward, instill drops: This is the correct method for a 12-year-old client. The ear should be pulled outward and upward to straighten the ear canal, allowing the drops to reach the deeper parts of the ear. Additionally, warming the bottle in your hands prevents discomfort that might arise from cold drops being instilled in the ear.

D) Warm bottle in hand, pull ear outward and downward, instill drops: This method is appropriate for children under 3 years old. For children older than 3 years, the ear should be pulled upward to open the ear canal.