Why do doctors flick syringes?

Before injecting the drug, doctors flick syringes to remove air bubbles.

Otherwise, air bubbles can cause pain and suffering, and they can also obstruct medicine absorption.

Small, invisible air bubbles in medication-filled syringes might cause issues when they are drawn into the syringe.

Furthermore, turbulence is created in a syringe by a doctor flicking it, causing air bubbles to rise and be driven back into the vial.

Hence, flicking a syringe is a simple and effective method for reducing the amount of air bubbles in the syringe used by doctors.