Pain can have many sensations such as neuropathy, inflammatory, burning or itching. Topical pain management
was commonly referred to as transdermal pain therapy. We now refer to it as permeation-enhanced topical pain
therapy (PETPT) because “transdermal” is now primarily associated with manufactured patches like fentanyl, not
compounded creams or gels.
Because we can get a large amount of active ingredients directly to the affected area in a permeation
enhancing base, this is a major benefit to compounding and applying topically.
Oral doses must be absorbed and then distributed systemically. Which results in a relatively low dose
ultimately arriving at the affected site. The oral dose needed to achieve therapeutic activity at the affected
site often manifests as unwanted side effects (gastric distress, sedation, hypotension, etc.). As a result,
the use of topical pain medications using a permeation enhancing base may be considered a viable alternative
to oral pain therapies in many patients. There are a multitude of studies to show the active pharmaceutical
ingredients we use have merit and clinical relevance today. The best pain medication is the one that addresses
your pain.
Acute vs Chronic Pain
Acute pain happens quickly and once the underlying issue is fixed will go away. Chronic pain is defined
as pain lasting longer than 6 months and can continue after the underlying issue has been fixed. Chronic
pain serves no biologic function as it is not a symptom of a disease process but is a disease process
itself. There are two types of chronic pain: inflammatory nociceptive pain and neuropathic pain.
Neuropathic Pain
People describe nerve pain as a shooting, burning pain. This pain may be constant or happen
intermittently. Sometimes it can feel sharp and sudden like an electric shock. It can sometimes occur as
a result of touch that would normally not be painful, like something lightly brushing your skin.
Neuropathic pain is produced by damage to the neurons in the peripheral and central nervous systems and
involves sensitization of these systems
Inflammatory Pain
Inflammatory nociceptive pain is associated with tissue damage and the resulting inflammatory process.
It is adaptive in that it elicits physiologic responses that promote healing. Based on visual
observation by Celcius in De Medicina self published in A.D. 25 he characterized inflammation by five
cardinal signs, namely redness (rubor), swelling (tumor), heat (calor; only applicable to the body'
extremities), pain (dolor) and loss of function (functio laesa). These 5 signs still apply today.