pharmacy calculations

Question

Order: Zithromax 500 mg po qd (every day) x 4 days

Supply stock: 100mg/5ml in a 50ml bottle

Supply stock: 200mg/5ml in a 100ml bottle

Supply stock: 100mg/5 ml in a 100ml bottle

Supply stock: 100mg/5ml in a 300ml bottle

What is the best choice for supply stock?

Answer 1

What you need is 500 mg/day * 4 days = 2000 mg

 

Stock 1: 100mg/5ml * 50ml will contain 1000 mg (insufficient)

Stock 2: 200mg/5ml * 100ml will contain 4000 mg (excessive)

 

Stock 3: 100mg/5ml * 100ml will contain 2000 mg

 

Stock 4: 100mg/5ml * 300ml will contain 6000 mg (excessive)