Injectable biopharmaceuticals, particularly prefilled syringes (PFS), come with risks related to the force of injection, such as patient pain and anxiety. The injection force can often be especially high with PFSs, due to the high viscosity of the contained substances.
"In clinical practice, injection pressure is commonly estimated by the injection force, which is a measure of effort required by the user during depression of the plunger on a delivery device. Previous studies have suggested that low exerted injection force was consistent with improved patient convenience and ease of injection."
Terumo Corporation has recently developed a tapered injection needle in the hopes that it will reduce the force of injection and improve the patient experience.