A patient is prescribed 80 mg of Tramadol Hydrochloride injection. The stock dose is 50mg / 2 mL. What volume will you require?

Prescription
_________ x ml = ?
Stock

80mg
___________ x 2 ml =
50mg

answer?

1 answer

To determine the volume required for an 80 mg dose of Tramadol when the stock concentration is 50 mg per 2 mL, you can set up a proportion based on the stock concentration.

  1. Identify the stock concentration:

    • 50 mg is present in 2 mL.
    • Thus, the concentration is \( \frac{50 \text{ mg}}{2 \text{ mL}} = 25 \text{ mg/mL} \).
  2. Determine the volume required for 80 mg:

    • If the concentration is 25 mg/mL, we need to find out how many mL are required for 80 mg.
    • Set up the equation based on the concentration: \[ \text{Volume (mL)} = \frac{\text{Desired Dose (mg)}}{\text{Concentration (mg/mL)}} \]
    • Substituting the values: \[ \text{Volume} = \frac{80 \text{ mg}}{25 \text{ mg/mL}} = 3.2 \text{ mL} \]

Therefore, you will require 3.2 mL of Tramadol Hydrochloride injection to administer an 80 mg dose.