A device designed to be used by a layperson to self-administer a subcutaneous injection, typically by a person who has difficulty with painless self-injections [e.g., patients with rheumatoid arthritis (RA)]. It is typically in the form of a tube or container in which a prefilled syringe assembly (syringe with medication and needle) is placed and secured; the user grips the device, places it on the body surface at the injection site, and presses the plunger of the syringe to inject the medication. The device may also enable needle penetration at an appropriate angle (typically 90° to the body surface) and to a pre-set depth. This is a reusable device.