How should Menopur 1200 IU (menotrophin) powder and solvent for injection be mixed if the powder does not dissolve immediately?

After adding all the supplied solvent to Menopur 1200 IU (menotrophin) powder, gently roll the vial between your hands until the solution is clear if it does not dissolve quickly, avoiding shaking and not administering the solution if it contains particles or is not clear.