Listeriosis is a disease caused by infection with a gram-positive, rod-shaped bacterium called Listeria monocytogenes. Listeria monocytogenes is ubiquitous, and it is usually found in soil, water, and decaying vegetation.
Common side effects of Plaquenil include. 1  nausea, 2  vomiting, 3  stomach pain or cramps,  loss of 1  appetite, weight loss, 2  diarrhea, dizziness,  spinning 1  sensation, headache,  ringing in 1  your ears, mood  changes, 1  nervousness, irritability,  skin rash, 1  itching,  or. hair loss.
Rheumatologist prescribed Plaquenil for inflamation due to autoimmune disorder. On third day, I developed an itchy bright red rash on neck. Stopped medication and started taking Benadryl for the itch. Two days later the rash spread to my chest, stomach, and back. Went to urgent care where I was told it was most likely a reaction to the Plaquenil. Received a cortisone shot and a prescription for Prednisolone (six day pack), and an antihistamine.