A client who is taking digoxin asks the nurse if they can take an antacid for heartburn. What is the nurse's best response?

Given:

Ordered dose of phenobarbital: 6 mg/kg/day divided equally every 12 hours

Patient weight: 44 lbs

Concentration of phenobarbital elixir: 20 mg/5 mL

Step 1: Convert patient weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Patient weight in kg = 44 lbs x 0.453592 kg/lb = 19.958 kg

Step 2: Calculate the total daily dose of phenobarbital:

Total daily dose (mg) = Ordered dose (mg/kg/day) x Patient weight (kg)

Total daily dose (mg) = 6 mg/kg/day x 19.958 kg

Total daily dose (mg) = 119.748 mg/day

Step 3: Calculate the dose per administration:

Dose per administration (mg) = Total daily dose (mg) / Number of administrations per day

Dose per administration (mg) = 119.748 mg/day / 2 administrations/day

Dose per administration (mg) = 59.874 mg

Step 4: Calculate the volume to be administered per dose:

Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)

Volume (mL) = 59.874 mg / (20 mg/5 mL)

Volume (mL) = 59.874 mg x (5 mL / 20 mg)

Volume (mL) = 14.9685 mL

Step 5: Round to the nearest whole number:

Volume (mL) ≈ 15 mL

A) Transdermal patch:
Transdermal patches are designed for slow, continuous delivery of medication through the skin over a long period of time, typically 24 hours. Although they provide steady medication levels, they do not offer a rapid onset of action. This route is more suitable for long-term control of conditions like angina but is not the fastest for immediate relief.

B) Topical ointment:
Topical ointments are applied to the skin and absorb slowly. While they may have local effects, they are not used for quick systemic effects. In the case of nitroglycerin, topical ointments are generally used for sustained release over several hours and are not intended for immediate relief of chest pain.

C) Suspended release:
Suspended release formulations are designed to release the drug slowly over time. Like transdermal patches, these formulations are meant for long-term management, not for rapid onset. A suspended release formulation of nitroglycerin would not provide the immediate relief that is typically needed in cases of acute angina or chest pain.

D) Sublingual:
The sublingual route provides the most rapid onset of action for nitroglycerin. When nitroglycerin is placed under the tongue, it is absorbed directly into the bloodstream through the mucous membranes of the mouth. This bypasses the digestive system and the liver (first-pass metabolism), allowing the drug to take effect quickly—usually within 1 to 3 minutes—making it ideal for acute relief of chest pain or angina. This route is commonly used for emergencies when rapid relief is needed.