PHR2021: Workshop 2

Solutions

Exercise 2

Ben Holioake
25 Browns Ave
Greenvale

Rx Calamine Lotion APF 23
Mitte 100 mL
Sig: Apply to rash prn
Dr A Beattie
45 Carrick Drive
Tullamarine
(12/03/2025)


A. Beattie

Patient info: Ben is an adult male who has a very itchy rash on his body.

PHR2021: Workshop 2

Examining the Prescription/Batch Records

  • Name: of the product. If it's APF then also record which APF.
  • Date of manufacture: Today. Date cannot be backdated.
  • Product: Type of the product (ointment? cream?)
  • Indication for use: Check prescription
  • Source of formula: APF, AMH, Martindale ...
  • Dosage check: especially needed if child
PHR2021: Workshop 2

Batch

  • Product name: same as the proforma
  • Batch number is not applicable since we're making it for one person
  • Ingredients: list all
  • Use: what role does each ingredient play
  • Formula: weight exactly written on your APF
  • QD: quantity dispensed, how much you actually make
  • Container: Light-resistant? air-tight? Clear?

Others

  • Remember that you're counselling on the product AND active ingredient
PHR2021: Workshop 2

Solution

Prescription Record

Date Patient Name Address Prescription Batch No. Prescriber Presc. No. Dispenser
12/03/2025 Ben Holioake 25 Browns Ave, Greenvale Calamine Lotion APF 23 (100 mL) N/A A Beattie SHP010715-3 SH

Expiry: 28 days

PHR2021: Workshop 2
Ingredient Quantity Purpose
Calamine 15 g Anti-pruritic
ZnO 5 g Skin protectant
Bentonite 3 g Susp. agent
Na citrate 0.5 g Preservative
Liquefied phenol 0.5 mL Preservative
Glycerol 5 mL Emollient
Water to 100 mL Vehicle/Diluent
PHR2021: Workshop 2

Exercise 3: Osmolarity (Ratios of ions upon dissociation)

Moles of :

Since dissociates as follows:

Then,

PHR2021: Workshop 2

For KCl:

We know , so:

In total,

PHR2021: Workshop 2

Exercise 4: Osmolarity

  1. of each salt:

  1. Moles of each salt:

, so:

PHR2021: Workshop 2

, so:

In total,

PHR2021: Workshop 2

Exercise 5: Equivalents (Charge of ion)

200 mL of soln, 5 mEq of per 5mL is equivalent to:

Thus, the total mEq in 200 mL is:

PHR2021: Workshop 2

has a valency of 2, so:

Because we have the hydrated salt, whihc dissociates as follows:

Each mole of gives 1 mole of ,

so .

PHR2021: Workshop 2

Knowing we need 0.100 mol of , and its MW is 147 g/mol, we can calculate the mass:

What is the number of milliosmoles contained in the following solution? - $\mathrm{MgCl_2\cdot6H_2O}$ (MW = 203.3): 3.7 g - $\mathrm{KCl}$ (MW = 74.6): 3.0 g - Water for injections, to 100 mL -

Calculate the number of milliosmoles (mOsm) in the following solution: - 50 mL of 0.067 M $\mathrm{KH_2PO_4}$ (0.908\% w/v) (MW = 136) - 50 mL of 0.067 M $\mathrm{Na_2HPO_4\cdot12H_2O}$ (2.39\% w/v) (MW = 358)