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Topical Pain Management for Medco Health Solutions Las Vegas, NV 3/13/11 by Joe Crea [email protected] Crea Healthcare Partnering Powell, OH

Medco CE - Topical Pain Management

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Page 1: Medco CE - Topical Pain Management

Topical Pain Managementfor

Medco Health SolutionsLas Vegas, NV

3/13/11

by

Joe [email protected]

Crea Healthcare PartneringPowell, OH

Page 2: Medco CE - Topical Pain Management

Disclosure Information

I have the following financial relationships to disclose:

• Honoraria and expenses paid by:

Medco Health Solutions

through

Business Services International, Inc.

• I have no other financial relationships to disclose.

• I will not discuss any investigational uses.

• I will not discuss any off label uses.

Page 3: Medco CE - Topical Pain Management

Epidemiology

> 50 million people are partially or totally disabled due to pain

• 70 to 90% of patients with advanced disease from cancer have significant pain that requires the use of opioid drugs.

• Severe, unrelenting pain interferes with patients' quality of life, including their activities of daily living, their sleep, and their social interactions.

Page 4: Medco CE - Topical Pain Management

Epidemiology (cont.)

• 80% of elderly patients have chronic pain. • 66% have pain in the last month of life• ~ ½ of hospitalized patients with pain are

under-medicated. • Estimated cost of pain is $150 billion per year • Up to 50% of patients who are taking pain

medication do not experience adequate relief

Page 5: Medco CE - Topical Pain Management

Economics

• Chronic pain causes 700 million lost work days/year in the U.S.

• > $ 9 billion per year on OTC pain products.

Page 6: Medco CE - Topical Pain Management

What is Pain?

Medical Definition:“Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage.”

International Association for the Study of Pain, 1979

“An unpleasant sensation induced by noxious stimuli and generally received by specialized nerve endings.”

CancerWEB, 2011

Operative Definition:“Pain is whatever the experiencing person says it is, existing whenever he/she says it does.”

Margo McCaffery, 1999

Page 7: Medco CE - Topical Pain Management

Physiologic Effects of Pain

Page 8: Medco CE - Topical Pain Management

Pain Behaviors

Page 9: Medco CE - Topical Pain Management

Presentation of PainAcute• Often obvious distress• Can be sharp, dull, shock-like,

tingling, shooting, radiation, fluctuating in intensity, and varying in location (occur in timely relationship to noxious stimuli)

• Comorbid conditions not usually present

• May see HTN, increased HR, diaphoresis, pallor…

Chronic• Can appear to have no

noticeable suffering• Can be sharp, dull, shock-

like, tingling, shooting, radiation, fluctuating in intensity, and varying in location (do NOT occur in timely relationship to noxious stimuli)

• Symptoms may change over time

• Usually NO obvious signs

Page 10: Medco CE - Topical Pain Management

Four Types of Pain Behaviors

• Facial/audible expression of distress

• Distorted ambulation or posture

• Negative affect

• Avoidance of activity

Page 11: Medco CE - Topical Pain Management

Autonomic Response to Pain

• Grimacing• Restlessness• Guarding• Increased respirations• Increased heart rate• Increased blood pressure• Diaphoresis

Page 12: Medco CE - Topical Pain Management

Emotions, Coping, and Pain

Chronic pain is associated with higher levels of anger, fear, sadness, anxiety and stress, but often fewer observable outward physical changes/signs.

Page 13: Medco CE - Topical Pain Management

Pain and the Brain

Page 14: Medco CE - Topical Pain Management

Pain Terminology, Classifications, and Pathophysiology

Page 15: Medco CE - Topical Pain Management

Pain terms

• Allogenic substances– chemicals released at the site of the injury

• Nociceptors– afferent neurons that carry pain messages

• Referred pain– pain that is perceived as if it were coming from

somewhere else in the body

Page 16: Medco CE - Topical Pain Management

PainPain disorders classified into several categories based upon origin: •Acute (Nociceptive)

– Somatic• Superficial (nociceptors of skin)• Deep [body wall (muscle, bone)]

–Visceral (sympathetic system; may refer to superficial structures of same spinal nerve)

•Chronic–Malignant (cancer) –Nonmalignant• Neuropathic (nerve injury)• Inflammatory (musculoskeletal)• Mixed or unspecified• Psychogenic

Page 17: Medco CE - Topical Pain Management

Acute Pain

• Travels into the spinal cord along the appropriate nerve root. • Nerve root splits into a front

division and a back division and carries pain sensation to the CNS (spinal cord and brain). • Passed to a short tract of nerve

cells (interneurons), which in turn synapse with a nerve tract that runs to the brain .

Page 18: Medco CE - Topical Pain Management

Acute Pain

• Sent out to the rest of the brain, connecting with thinking and emotional centers.

• A modifier pathway from the brain modifies pain at the synapses in the back part of the spinal cord (acute pain is decreased rapidly after tissue injury).

Page 19: Medco CE - Topical Pain Management

Peripheral Nerve Fibers Involved in Pain Perception

• A-delta fibers–small, myelinated fibers that transmit sharp pain

• C-fibers–small unmyelinated nerve fibers that transmit dull or aching pain.

Page 20: Medco CE - Topical Pain Management

Chronic Pain• Neuropathic - severe pain disorder that

results from damage to the central and peripheral nervous systems. –Centrally generated–Peripherally generated

• Inflammatory - results from the effects of inflammatory mediators.

Page 21: Medco CE - Topical Pain Management

Chronic Pain Conditions

• Neuralgia– an extremely painful condition consisting of

recurrent episodes of intense shooting or stabbing pain along the course of the nerve.

• Causalgia– recurrent episodes of severe burning pain.

• Phantom limb pain– feelings of pain in a limb that is no longer there

and has no functioning nerves.

Page 22: Medco CE - Topical Pain Management

Pain Without Physical Findings

• Persists long after healing

• May spread and increase in intensity

• May become stronger than was the initial pain from the injury

Page 23: Medco CE - Topical Pain Management

Pain Assessment and Management

Page 24: Medco CE - Topical Pain Management

Pain Assessment: PQRST mnemonic

• P: Precipitating and palliating factors•Q: Quality•R: Region and radiation• S: Severity• T: Time

Page 25: Medco CE - Topical Pain Management

Pain Assessment: Instruments

• Single-dimension–Visual analog scale–Verbal numerical scale–Verbal rating scale

•Multidimensional – assesses the pain as well as the emotional and behavioral effects of the pain.

Page 26: Medco CE - Topical Pain Management

Pain Assessment: Single-dimension Instruments

Visual analog and Verbal numerical scales

Page 27: Medco CE - Topical Pain Management

Pain Assessment: Single-dimension Instruments

Verbal rating scale• No pain = 0•Mild pain = 1-3•Moderate pain = 4-6• Severe pain = 7-9•Worst ever = 10

Page 28: Medco CE - Topical Pain Management
Page 29: Medco CE - Topical Pain Management

WHO Analgesic Ladder

Page 30: Medco CE - Topical Pain Management

Non-pharmacologic Pain Management

• Neurostimulation• TENS• Acupuncture• Anesthesiology• Nerve block• Surgery• Physical therapy• Exercise• Heat/cold• Psychological approaches

• Cognitive therapies(relaxation, imagery, hypnosis)

• Biofeedback• Behavior therapy• Psychotherapy• Complementary tx• Massage, art, music,

aroma therapy

Page 31: Medco CE - Topical Pain Management

Pharmacology of NociceptionFour Steps:1. Transduction– NSAIDs, Local Anesthetics & Anticonvulsants

2. Transmission– Opioids, NMDA Antagonists

3. Perception– Distraction, Relaxation, Imagery

4. Modulation– Tricyclic Antidepressants, Opioids, GABA Agonists

Page 32: Medco CE - Topical Pain Management

Pharmacology of Nociception

Page 33: Medco CE - Topical Pain Management

Pharmacology of Nociception

Page 34: Medco CE - Topical Pain Management

Routes of Administration

• Intramuscular• Intravenous • Intraspinal • Local/Regional blocks• Oral • Rectal • Subcutaneous • Sublingual • Transdermal / Topical**

Page 35: Medco CE - Topical Pain Management

Three Major Classes of Drugs Used to Treat Pain

• NSAIDs & Acetaminophen– Peripherally acting

• Opioid Analgesics– Centrally acting (bind to brain opioid receptors)

• Adjuvant Analgesics– Affect non-pain conditions (e.g. emotions that can

exacerbate pain condition)

Page 36: Medco CE - Topical Pain Management

Pain Type: Nociceptive (Visceral & Somatic)

Non-Opioids – WHO first lineThese agents act peripherally.

• Often used to treat acute pain (e.g. strains, sprains, sore muscles) and OA

• Most topical analgesics fall into this class– Many are these used in conjunction with oral

analgesics (e.g. ASA, APAP, NSAID)

Page 37: Medco CE - Topical Pain Management

Nociceptive (Visceral & Somatic)

Traditional Oral Choices:

1. Acetaminophen (Tylenol®) 325-1000 mg q 4-6hPO/PR Max= 4 gm/day. Recommended as first-line

2. Salicylates• Choline/Magnesium Salicylates (Trilisate®) 750-

1500mg PO BID (Max= 3 gm/day)• Aspirin 325-650 mg PO q4h (Max=4 gm/day)

Page 38: Medco CE - Topical Pain Management

Nociceptive (Visceral & Somatic)

Traditional Oral Choices:

3. NSAIDsa. Non-selective COX Inhibitors

• e.g. Ibuprofen (Motrin®, Advil®) 200-800 mg po q6h Max=3200 mg/day

• e.g. Naproxen (Naprosyn®) 250-500 mg po BID-TID Max= 1500 mg/day

b. COX-2 Selective Inhibitors• e.g. Celecoxib (Celebrex®) 100-400 mg po

QD-BID

Page 39: Medco CE - Topical Pain Management

Topical NSAIDs, Salicylates, Capsaicin

• Only considering those commercially available; excludes compounded combinations.

• Trials in the past 5 yrs:– Diclofenac diethylamine gel– Diclofenac solution– Ketoprofen gel– Ibuprofen cream or gel

Page 40: Medco CE - Topical Pain Management

Topical Non-Opioids

• Provide local pain relief• Many Formulations (cream, gel, oil, patch)• 3 Main Classes:

1. NSAIDs2. Counter-irritants

a. camphor, eucalyptus, menthol (e.g. IcyHot®, ArthriCare®)

b. Salicylates (e.g. Aspercreme®)3. Capsaicin

Page 41: Medco CE - Topical Pain Management

Topical vs Oral NSAIDs?

• NSAIDs: – considered efficacious for OA pain– Dose-dependent risk of renal & GI toxicity

• Pharmacology:– Relieve pain by inhibiting COX• COX: promotes the formation of inflammatory

mediators such as prostacyclin, prostaglandin, and thromboxanes

• Few trials evaluating topical vs. oral NSAIDs

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Topical vs Oral NSAIDs

– European Guidelines:• Topical NSAIDs preferred over Oral NSAIDs, if:–Knee or hand–Few joints involved–Mild-moderate severity–Sensitivity to oral NSAIDs

– Why isn’t this the case in the US?• US Guidelines: list capsaicin and salicylates

only.• Discussion

Page 43: Medco CE - Topical Pain Management

Topical NSAID: Diclofenac sodium

• Diclofenac 1% gel – First Topical NSAID (Rx)– ~$35-$40/100 g tube – for OA

• Diclofenac 3% gel – for actinic keratosis only• Diclofenac 1.3% patch – for strains, sprains

and contusions– applied to most painful area 2x/day

• Penetrates skin ~ 3-4 mm

Page 44: Medco CE - Topical Pain Management

Diclofenac 1% gel

• Oral NSAIDs, but NOT topical NSAIDs have been linked to increased GI, renal, & CV complications & hospitalizations– Despite low systemic exposure, carries same Black

Box warning and safety precautions as oral diclofenac.

• Hand and Knee OA:– Clinically significant reductions in pain &

improvement in physical function

Page 45: Medco CE - Topical Pain Management

Patient Counseling w/ topical NSAID

• Gently massage into intact skin – cover entire AA• Use dosing card (1 per application) to apply the gel.• Avoid showering/bathing > 1hr after applying• Avoid external heat and/or occlusive dressings• Do not cover with clothing/gloves for at least 10

minutes• Concomitant use of diclofenac gel with oral NSAIDs

has not been evaluated; may increase NSAID ADEs.

Page 46: Medco CE - Topical Pain Management

Topical Diclofenac Dosing• Diclofenac gel:– Lower extremities, including the knees, ankles,

and feet: • Usual Dosage: 4 g to the affected foot, knee, or ankle

4x/day. Max: 16g/d to any single lower extremity joint • Maximum Dose: 32 g per day, over all affected joints.

– Upper extremities, including the elbows, wrists, and hands:• Usual Dosage: 2 g to affected hand, elbow, or wrist

4x/day. • Max Dose: 8 g/day to any single joint of the upper

extremities.

Page 47: Medco CE - Topical Pain Management

NSAID Adverse Effects• Highest incidence of adverse events• Gastropathy– ASA benefits offset by ADEs– Provide gastric cytoprotection for NSAIDs, if

appropriate.– Cox-2 selective inhibitors have decreased risk.

• Renal insufficiency– Maintain adequate hydration

• Inhibition of platelet aggregation– Assess for coagulopathy

Page 48: Medco CE - Topical Pain Management

Salicylates (OTC)

• Derivatives of acetylsalicylic acid (ASA), but different MOA

• MOA: counter-irritant, stimulating pain receptors with the hope of desensitizing them over time.– Interference with transcription factors and kinases

involved in inflammation?– Do not appear to inhibit COX enzymes.

Page 49: Medco CE - Topical Pain Management

Salicylates • Skin penetration: ~ 3-4 mm• Use:– Painful acute conditions– Not recommendation for chronic pain conditions

(poor to moderate efficacy)• OA may be an exception.• Very FEW clinical trials published reg. topical salicylate

in tx of OA

• Examples:– Trolamine salicylate (e.g. Aspercreme®)– Methyl salicylate (e.g. BenGay®, IcyHot®)

Page 50: Medco CE - Topical Pain Management

Salicylates

• Safety:– Have been associated with severe toxicity and

death after topical application and intention/unintentional ingestion.

– Like NSAIDs, may increase risk of bleeding; therefore, pharmacointeraction w/ warfarin

• Point: OTC does not necessarily mean safer than Rx!

Page 51: Medco CE - Topical Pain Management

Capsaicin (OTC)

• MOA: – Counterirritant, eventually desensitizing nerves (a

result of apparent reversible nerve degeneration)– Depletion of Substance P and calcitonin gene-

related peptide.

• Skin penetration – Negligible; may be less effective analgesic than

salicylates or topical NSAIDs.

Page 52: Medco CE - Topical Pain Management

Capsaicin – Efficacy: • OA: Clinical trials showed modest benefit in OA pain

relief, even after excluding treatment failures from study data analysis.• Chronic musculoskeletal pain: poor-to-moderate

efficacy as monotherapy. May have a role as adjunctive therapy.

– Safety:• No serious adverse events reported• Extreme irritation if contact with eye or mucosal tissue.

– Tolerability:• Effects not immediate; therefore, patients may

discontinue prematurely.

Page 53: Medco CE - Topical Pain Management

Additional Considerations

• Adherence– Topical NSAID: 4x/day– Topical salicylates & capsaicin: prn

• Administration – Rubbing an already sore joint/painful area?– Inconvenient?– Messy?

Page 54: Medco CE - Topical Pain Management

Agent Pharmacology Efficacy Safety Cost (US$)

Topical NSAID

Diclofenac gel

COX-2 inhibition w/ reduced COX inhibition

Penetrates 3-4mm

Suitable for OA of knee or hand

Effective monotherapy for mild-mod OA of hand or knee

Equivalent analgesia to PO

NNT for 50% pain reduction: 3

AEs: local

Low risk of GI, CV or renal Ses

Same Black Box as oral

Do not combine w/ other NSAIDs

$35-40/100g tube

Salicylates Counterirritant – desensitizes pain receptors

Modest efficacy in chronic painNo data for OAAdjunct to NSAIDsNNT: 5.3

Excessive use or ingestion can be toxic

$6.99 - $8.99/ 57 g tube

Capsaicin Counterirritant – desensitizes pain receptors

Modest adjunctive txMinimal as monotxNNT: 8.1

Application site; pain & burning early on

$19.99- $22.49/57g tube

Page 55: Medco CE - Topical Pain Management

Neuropathic Pain• Tricyclic Antidepressants: – First line for non-stabbing pain– Examples• Desipramine (Norpramin®) • Nortriptyline (Pamelor®)• Doxepin (Sinequan®) • Imipramine (Tofranil®)• Amitriptyline (Elavil®)

– Usual dose: 10-25 mg q HS, titrate up to 150

• Serotonin/Norepinephrine Reuptake Inhibitor– Duloxetine (Cymbalta®)

Page 56: Medco CE - Topical Pain Management

Neuropathic Pain

• Anticonvulsants–�First line for stabbing pain– Examples• Gabapentin (Neurontin®) 300-1200 mg TID Up to 6

g/d• Pregabalin (Lyrica ®) 50-100mg TID• Carbamazapine (Tegretol®) 200-400 mg QID• Divalproex Na(Depakote®) 500-2000 mg q HS

Page 57: Medco CE - Topical Pain Management

Neuropathic Pain

• Lidocaine transdermal patch – Only topical for neuropathic pain– Indicated for post-herpetic neuralgia• Apply up to 3 patches, only once, for up to 12

hrs. within a 24 hours period• Apply to cover skin in most painful area

– MOA: Inhibits conduction of nerve impulses– Penetration: allows for local analgesia, but

insufficient to result in complete sensory block.– Pearl: patches can be cut if done b/f removing

release liner

Page 58: Medco CE - Topical Pain Management

Moving from Peripherally Acting Agents to Centrally Acting:

Opioids

Page 59: Medco CE - Topical Pain Management

Nociceptive Pain (Visceral & Somatic)

WHO 2ND or 3rd line• Opioid/non-opioid combinations– Hydrocodone/APAP (Vicodin®, Lortab®)– Oxycodone 5 mg /APAP 325mg (Percocet®)– Codeine/APAP (Tylenol with Codeine®)– Propoxyphene/APAP (Darvocet N®)

(Maximum APAP/24hours = 4000 mg)

Page 60: Medco CE - Topical Pain Management

WHO Analgesic Ladder

Page 61: Medco CE - Topical Pain Management

Chemical Classes of Opioids

• PHENANTHRENES– Morphine – Codeine – Hydromorphone– Hydrocodone– Oxycodone

• DIPHENYLHEPTANE DERIVATIVE– Methadone– Propoxyphene

• PHENYLPIPERIDINE DERIVATIVES– Meperidine – Fentanyl

Page 62: Medco CE - Topical Pain Management

Not recommended . . .• Propoxyphene (Darvon®, Darvocet®)– No better than placebo; low efficacy at commercially

available doses.– Toxic metabolite at high doses.– Gone in Europe since 2005.

• Mixed agonist-antagonists– Compete with agonists →withdrawal– E.g. pentazocine (Talwin®),butorphanol (Stadol®),

nalbuphine (Nubain®) – Analgesic ceiling effect– High risk of psychotomimetic ADEs w/ pentazocine,

butorphanol

Page 63: Medco CE - Topical Pain Management

Opioids & The Skin?• New field of interest– Small RCTs demonstrate effectiveness in chronic

pain management

• Growing evidence regarding opioid receptors (OR) in various skin structures– Peripheral nerve fibers– Keratinocytes– Melaninocytes– Hair follicles– Immune cells

• Potential Benefits?

Page 64: Medco CE - Topical Pain Management

Opioids

• Receptor response on activation:– Mu: analgesia, respiratory depression, miosis,

euphoria, reduced gastrointestinal motility

– Kappa: analgesia, dysphoria, psychotomimetic effects, miosis*, respiratory depression*

– Delta: Analgesia*Less intense than with Mu activation

Page 65: Medco CE - Topical Pain Management

Opioids• Opioids: Immediate release

Morphine (MS IR®, Morphine Sol. Tabs)Hydromorphone (Dilaudid®)Methadone Oxycodone (Oxy IR®)Oxymorphone (Opana ®)Codeine, hydrocodone, morphine, hydromorphone, oxycodone

– Dose q 4 h & adjust dose daily depending on pain – Mild-mod pain: increase daily dose by 25-50%– Mod to severe pain: increase daily dose by 50-100%

Page 66: Medco CE - Topical Pain Management

Opioids

–Opioids Sustained Release• Morphine SR 8-12 hr (MS Contin®)• Oxycodone SR (OxyContin®)• Morphine SR 24 Hr (Avinza®)• Fentanyl Transdermal (Duragesic®)**• Oxymorphone ER (Opana ER ®)

– Long Acting • Methadone

Page 67: Medco CE - Topical Pain Management

Opioids• Extended-release preparations– Improve compliance, adherence– Dose q 8, 12, or 24 h (product specific)– Do not crush or chew tablets– May flush time-release granules down feeding

tubes– Adjust dose q 2-3 days (once steady state

reached)

Page 68: Medco CE - Topical Pain Management

Breakthrough Dosing

• Use immediate-release opioids– 5%–15% of total 24-hour dose– Offer breakthrough dose after Cmax reached• po / pr ≈q 1 h• Sub-Q, IM ≈q 30 min• IV ≈ q 10–15 min

• Do NOT use extended-release opioids for breakthrough pain!

Page 69: Medco CE - Topical Pain Management

Opioid Allergy

• Anaphylactoid/-ic reactions are the only true allergies.

• Incidence 1:200,000

• Urticaria (hives) with diffuse rash can be allergies. Needs careful assessment!

Page 70: Medco CE - Topical Pain Management

Opioid Adverse EffectsCommon Uncommon

Constipation Bad dreams/hallucinations

Dry mouth Dysphoria/delirium

N/V Myoclonus/seizures

Sedation Pruritus/urticaria

Sweating Respiratory depression

Urinary retention

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Constipation from Opioids

Occurs with all opioids:• Pharmacologic tolerance develops slowly or not at

all.• Dietary interventions alone usually not sufficient.• Avoid bulk-forming agents in debilitated patients.• Stimulant Laxative + Stool Softener is ideal (e.g.

Senna S).

Page 72: Medco CE - Topical Pain Management

Adverse Effect Management

• Constipation (prophylaxis or treatment)

• Urticaria

• Senna Docusate ‐ 1 2 tabs ‐po hs or bid Bisacodyl 5 10 mg po daily ‐+/ docusate 100 mg po ‐bid

• Hydroxyzine 25 100 mg ‐q4 6h prn‐

• Diphenhydramine 25 50 ‐mg q6h prn

Page 73: Medco CE - Topical Pain Management

Respiratory Depression• Opioid effects differ

between patients

• Pain: a potent stimulus to breathe

• Loss of consciousness precedes respiratory depression

• Rapid pharmacologic tolerance

RespiratoryDepression

Loss of Consciousness

Sedation

Analgesia

Pain

DOSE

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Opioid-Induced Neurotoxicity

• Patients on morphine or hydromorphone– Morphine > Hydromorphone– May continue to have pain with neuro-excitatory

side effects.– Renal insufficiency> Normal renal function– High dose > low dose

• Further increase of dose exacerbates excitatory behaviors.

• ***Can Occur with ALL Opioids at High Doses

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Primary Causes of Opioid-Induced Neurotoxicity

• Depends on both dose and duration of therapy.• Opioid metabolites– Oral morphine metabolized in the liver & GI mucosa.– 50% morphine 3-glucuronide (M3G) • No analgesia• Neurotoxic side effects

– 10% morphine-6-glucuronide• Analgesic activity• Longer t½ than morphine

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…..Opioid-Induced Neurotoxicity

• Other precipitating factors include:– Underlying delirium– Dehydration– Acute renal failure– Advanced age– Psychoactive medications (e.g. BZDs, TCAs)

• Increasing reported incidence as practitioners get more comfortable and aggressive with opioids.

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Opioid-Induced Neurotoxicity

• Early recognition is critical:• Myclonus –twitching of large muscle groups• Delirium• Hallucinations/Seizures• Rapidly escalating dose requirement• Hyperalgesia/Allodynia• Pain “doesn’t make sense”; not consistent w/ recent

pattern or known disease.

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Treatment

• Rotate to a structurally dissimilar opioid (i.e. differing receptor affinity profiles or chemical class.)

• Hydration• Benzodiazepines for neuromuscular excitation• Behavioral excitation resolves over hours to

days with treatment.

Page 79: Medco CE - Topical Pain Management

Chemical Classes of Opioids

• PHENANTHRENES– Morphine – Codeine – Hydromorphone– Hydrocodone– Oxycodone

• DIPHENYLHEPTANE DERIVATIVE– Methadone– Propoxyphene

• PHENYLPIPERIDINE DERIVATIVES– Meperidine – Fentanyl

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Fentanyl (Duragesic®)is the only topical opioid in U.S.

Advantages• Useful as an alternative to

parenteral administration

• May improve compliance/adherence

• For mgmt of persistent moderate – severe pain requiring ATC treatment

Disadvantages• Difficult to dose correctly• Slow onset/offset of action• Difficult to respond to

changing pain– Dependent on physiological

state of patient– Cachexia– Fever– Diaphoresis

• Expensive

Page 81: Medco CE - Topical Pain Management

Fentanyl

• Important Considerations:– ONLY for patients opioid tolerant and requiring a

total daily opioid dose of at least fentanyl 25 mcg/h patch• Tolerant: morphine (or equiv) 60mg/day for > 1wk

– Must evaluate pain control using IR system prior to using extended/modified-release system

– Follow WHO guidelines!

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Fentanyl • Dosage Titration:

• Starting dose: • based on daily morphine dose. Generally conservative.

• Dose Increases: • Increase dose only after 3 days, based on the amt of IR opioid

needed for break-through pain in days 2 & 3.• (45 mg oral morphine: 12.5 mcg/h increase in patch dose)

• New equilibrium: • May not occur until 6 days after dose increase.• Wait at least 2 applications before further increasing dose!

Page 83: Medco CE - Topical Pain Management

Fentanyl Transdermal

• Criteria for use:– Not cachectic – Unable to take PO/PR/SL– Patient compliance– Caregiver availability– Opioid abuse or diversion – Patient request

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Fentanyl Dose Conversion Chart – ONLY WHEN CONVERTING ORAL TO PATCH & NOT WHEN CONVERTING PATCH TO ORAL!!)

Current Analgesic Daily Dose (mg/day)

Oral morphine 60 to 134 135 to 224 225 to 314 315 to 404

IM/IV morphine 10 to 22 23 to 37 38 to 52 53 to 67

Oral oxycodone 30 to 67 67.5 to 112 112.5 to 157 157.5 to 202

IM/IV oxycodone 15 to 33 33.1 to 56 56.1 to 78 78.1 to 101

Oral codeine 150 to 447 448 to 747 748 to 1,047 1,048 to 1,347

Oral hydromorphone 8 to 17 17.1 to 28 28.1 to 39 39.1 to 51

IV hydromorphone 1.5 to 3.4 3.5 to 5.6 5.7 to 7.9 8 to 10

IM meperidine 75 to 165 166 to 278 279 to 390 391 to 503

Oral methadone 20 to 44 45 to 74 75 to 104 105 to 134

IM methadone 10 to 22 23 to 37 38 to 52 53 to 67

Recommended fentanyl transdermal system dose

Fentanyltransdermal system 25 mcg/h 50 mcg/h 75 mcg/h 100 mcg/h

Facts & Comparison 4.0. Accessed May 10, 2009

Page 85: Medco CE - Topical Pain Management

Cancer Pain

• Multiple possible etiologies of cancer pain• Classes of medications other than those

traditionally considered “analgesics” used to address these

• As with non-cancer pains, topical analgesics options include:– lidocaine & capsaicin: neuropathic pain– fentanyl transdermal: chronic pain

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Physical Dependence

• A process of neuro-adaptation• Abrupt withdrawal may → abstinence

syndrome• �If dose reduction required, reduce by 25-

50% q 2–3 days; avoid antagonists.

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Tolerance

• Reduced effectiveness to a given dose over time.

• If dose is increasing– suspect opioid tolerance– disease progression – psychological/spiritual pain

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Addiction

• Acceleration of abuse patterns onto a primary illness.

• Characteristics:– psychological dependence– compulsive use– loss of control over amount and frequency of use– loss of interest in pleasurable activities– continued use of drugs in spite of harm

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Pseudoaddiction

• Drug seeking behavior associated with a person’s need to relieve pain and suffering, not an obsession with the mood altering affects of medication.

Wesson et al, 1993

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Chronic Pain Medical Issues

• Physical Exam• History documenting prescribing rationale• Pain assessment documentation

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Legal Issues

• Accurate prescription records–Controlled substance laws– Schedule II• Emergency Telephone Prescriptions• Terminally Ill/Nursing Home Patients Fax

prescriptions

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Skilled Prescribing

• Patient –Physician Partnership• Pain management expectations• Medication responsibilities• One physician • One pharmacy

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References1. Acute Pain Management Clinical Practice Guidelines. U.S. Department of Health and Human

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