Medication Assisted Treatment

Michael Palladini, RPh MBA CAC [email protected]

“BUNAVAIL is the first and only FDA-approved buccal film formulation of buprenorphine and naloxone and will compete in the $1.7 billion and growing U.S. opioid dependence market.”

-NASDAQ, 9/3/14

Objectives

 List the medications by generic and brand name, as well as appropriate starting and maintenance dosages for each, utilized for medication assisted treatment.

 Identify the pharmacological properties of the medications used for opioid dependence treatment, how these properties benefit patients, and the proper use in a clinical setting.

 Describe the withdrawal symptoms of opioid dependence and the significance of these symptoms in initiating and maintaining treatment with specific medications.

Vermont Governor Shumlin's 2014 State of the State Address

Opiates/Opioids

• • • • • • • • • • Morphine Codeine Heroin Oxycodone Hydrocodone Oxymorphone Hydromorphone Fentanyl Buprenorphine Methadone

“Traditional Pain Relievers”

Opioids

• • • •

Therapeutic Effects Analgesia Sedation/Relaxation Euphoria Cough Suppression

• • • • • • • • •

Side Effects Nausea/Vomiting Dizziness Headache Constipation Sweating Pruritus Dry mouth Miosis

Respiratory Depression

Tolerance

1. Pharmacokinetic 2. Pharmacodynamic 3. Learned

Early Withdrawal

• • • • • • • • Muscle aches restlessness anxiety lacrimation (eyes tearing up) runny nose excessive sweating inability to sleep yawning very often

Fully Developed Withdrawal

• • • • • • • diarrhea abdominal cramping goose bumps on the skin nausea and vomiting dilated pupils and possibly blurry vision rapid heartbeat high blood pressure

Current Medications:

History of MAT

 Late 19 th Early 20 th Century  Public perceptions/use  Addiction ≠ Disease  Increased use in 1950’s and 1960’s  Addiction = Disease  Methadone use

Methadone

• • • • • Synthetic opioid “Full agonist action” Use in opioid dependence circa 1965 Narcotic Addict Treatment Act of 1974 Considerable federal and state regulations

Buprenorphine

• • • • DATA 2000 Semi synthetic opioid “Partial agonist action” The “DEA physician waiver”

Naltrexone

• • • • • Synthetic molecule “Antagonist action” FDA original approval for opioid dependence 1984 FDA approved for alcohol dependence 1994 Vivitrol® FDA approved in 2006 (alcohol), 2010 (opioid)

Receptor

Mu 1 Mu 2 Delta Kappa

Opiate Receptors

Location Function

Brain, Spinal Cord, Intestinal Tract Brain, Spinal Cord, Intestinal Tract Brain, Peripheral Sensory Neurons Brain, Spinal Cord, Peripheral Sensory Neurons Analgesia, Physical Dependence Respiratory Depression, Euphoria, Miosis, GI Motility, Physical Dependence Analgesia, Physical Dependence, Antidepressant Effects Dissociative, Dysphoria, Miosis, Sedation

Mu Receptor

Treatment

• Methadone (Highly Regulated) • Buprenorphine (Moderately Regulated) • Naltrexone (Slightly Regulated)

Methadone

• • • DEA Schedule 2 Clinic Setting Only 28 PA. CODE CH 715 -Clinic policy/procedures -Physician/Staffing criteria

Methadone

• • • • • Generic drug (Roxane, Mallinckrodt Pharma) Available in 5mg, 10mg Tablets “Methadose” 40mg wafer 10mg/ml liquid syrup Oral dosage formulations

Methadone

• • • • • Starting Dose = 30mg Institute upward titration Maintenance Dosage ranges from: 1 or 2 mg to >200mg/daily Once daily dosing “Privilege” dosing schedules Step 0 through Step 6

Methadone

• • • • • Inactive metabolites Half-life avg. of 30hrs; range of 4 to 91 hrs 2 to 4 hrs peak Metabolized extensively by CYP450 system Cost = $100/week

Methadone Issues

• • • Abuse/Diversion/Overdose Use of other drugs -Opiates/Cocaine/Benzodiazepines Drug Interactions -Significant Dosing Issues -Complex/Extensive Metabolism -Prolonged Withdrawal

Buprenorphine

• • • • DEA Schedule 3 Only FDA approved medication for OP (Physician-Office Based) treatment of opiate dependence DATA 2000 Sublingual Formulation

Buprenorphine

• • • • Suboxone® (Reckitt-Benckiser) Buprenorphine (Formerly Subutex®, Generic) Zubsolv® (Orexo Pharma) Bunavail® (BioDelivery Sciences)

Suboxone

Zubsolv

Bunavail

Administration of Buprenorphine

Sublingual Buccal

Buprenorphine

• • Starting dose = 16mg bid or 32mg tid Variable maintenance dosing -2mg to 24mg daily -single or divided dosing

Buprenorphine

• • • • • • • • 1 to 4 hours peak Half life of 20 to 73 hours 8 -12 hrs duration (<4mg) 24 -72 hrs duration (>16mg) Partial mu agonist/Kappa antagonist Active metabolites Cost = Office visit ($100 to $400/month) Cost = Medication ( $5 to $8/dose)

Buprenorphine Issues

• • • Abuse/Diversion/Overdose Treatment/Counseling issues -DATA 2000 requirements -Payer requirements Drug Interactions

Naltrexone

• • • • • Non-scheduled medication Vivitrol® (Alkermes) 380mg IM q28 days 7-10 days opiate free period Cost= $800+ per monthly injection

Naltrexone

Naltrexone

• Initial peak at 2 hours • Second peak at 2 3 days • Plasma concentrations begin to decline at 14 days • Half life 5-10 days

Naltrexone Issues

• • • • Vulnerability to opioid overdose Precipitation of opioid withdrawal Switching from agonist therapy Cost

“You can check out any time you like, but you can never leave”

MAT Issues/Questions/Concerns

• • • • • • Harm Reduction vs. Drug Free Models Diversion Tapering/Detox Profit Motives Long Term Effects Lack of Data