Bufotoxins are a family of toxic steroid lactones . They occur in the parotoid glands , skin and poison of many toads ( genus Bufo ) and other amphibians, and in some plants and mushrooms.    The exact composition varies greatly with the specific source of the toxin. It can contain: 5-MeO-DMT , bufagins , bufalin , bufotalin , bufotenin , bufothionine , epinephrine , norepinephrine , and serotonin . The term bufotoxin can also be used specifically to describe the conjugate of a bufagin with suberylargine. 
Janelle Norman, Topical Steroid Withdrawl Janelle Norman, Topical Steroid Withdrawl
Epidural steroid injections are most commonly used in situations of radicular pain, which is a radiating pain that is transmitted away from the spine by an irritated spinal nerve. Irritation of a spinal nerve in the low back ( lumbar radiculopathy ), such as from lumbar spinal stenosis , cervical spinal stenosis, herniated disc , and foraminal encroachment, causes back pain that goes down the leg. Epidural injection is also used as a minimally invasive procedure to treat nerve compression in the neck (cervical spine), referred to as cervical radiculopathy , which causes pain.