Histamine plays an important role in morphine addiction and memory-dependent behavior. However, little is known about the effect of histamine on the impairment of memory after morphine withdrawal.

After receiving an injection, some people experience symptoms at the injection site on the skin. This reaction is a common adverse effect of vaccines, Botox injections, biologics, and chemotherapy.

A subcutaneous injection, or shot, enters the fatty tissues just beneath the skin. It is shallower than an injection into muscle tissue. Healthcare professionals often use subcutaneous injections for ...