How should Zomacton 4 mg (somatropin) be mixed after adding the supplied solvent to the powder?

After adding the supplied solvent to Zomacton 4 mg (somatropin), gently swirl the vial with a rotary motion until completely dissolved into a clear, colourless solution, avoiding shaking or vigorous mixing because the powder mainly contains proteins; discard the vial and contents if cloudy or containing particles after mixing.