Step 1 is to calculate the amount of hydroxyzine HCL in each mL of the oral suspension. This is done by dividing the total amount of hydroxyzine HCL (25 mg) by the total volume (5 mL), which gives us 5 mg/mL. Step 2 is to calculate the volume of oral suspension that contains 50 mg of hydroxyzine HCL. This is done by dividing the prescribed dose (50 mg) by the concentration of the oral suspension (5 mg/mL). So, 50 mg ÷ 5 mg/mL = 10 mL.

So, the correct answer is 10 mL.

Choice A rationale:

Treating nasal rhinitis with an over-the-counter antihistamine is not directly related to neostigmine use or myasthenia gravis.

Choice B rationale:

If a medication dose is missed, wait until the next scheduled dose to take the medication is not the best advice. Neostigmine should be taken at regular intervals for maximum effectiveness.

Choice C rationale:

Expecting diaphoresis as a side effect of the neostigmine is not accurate. Diaphoresis is not a common side effect of neostigmine.

Choice D rationale:

Taking the medication 45 minutes before eating is correct. This timing helps maximize the medication’s effectiveness during meals, when muscle strength for swallowing is crucial.

So, the correct answer is,

D.

The correct answer is choice C. Apply gentle pressure with a finger to the tragus of the ear.

Choice A rationale:

Chilling the medication prior to administration is not recommended. Cold ear drops can cause dizziness or discomfort when instilled into the ear. It is generally advised to warm the drops to body temperature by holding the bottle in your hands for a few minutes before administration.

Choice B rationale:

Holding the dropper against the ear canal while instilling the medication is incorrect. The dropper should be held above the ear canal to avoid contamination and injury. Touching the dropper to the ear canal can introduce bacteria and cause infection.

Choice C rationale:

Applying gentle pressure with a finger to the tragus of the ear helps to facilitate the flow of the medication into the ear canal. This action helps to ensure that the medication reaches the affected area effectively.

Choice D rationale:

Straightening the external auditory canal by pulling it down and back is incorrect for adults. For adults, the correct method is to pull the ear up and back to straighten the ear canal. Pulling it down and back is the method used for children.