Zohydro

ZOHYDRO- hydrocodone bitartrate capsule, extended release
Zogenix, Inc.

WARNING: ADDICTION, ABUSE, AND MISUSE; LIFE-THREATENING RESPIRATORY DEPRESSION; ACCIDENTAL INGESTION; NEONATAL OPIOID WITHDRAWAL SYNDROME; INTERACTION WITH ALCOHOL; and CYTOCHROME P450 3A4 INTERACTION

Addiction, Abuse, and Misuse
ZOHYDRO ER exposes patients and other users to the risks of opioid addiction, abuse, and misuse, which can lead to overdose and death. Assess each patient’s risk prior to prescribing ZOHYDRO ER and monitor all patients regularly for the development of these behaviors or conditions [see Warnings and Precautions (5.1)].

Life-threatening Respiratory Depression
Serious, life-threatening, or fatal respiratory depression may occur with use of ZOHYDRO ER. Monitor for respiratory depression, especially during initiation of ZOHYDRO ER or following a dose increase. Instruct patients to swallow ZOHYDRO ER capsules whole; crushing, chewing, or dissolving ZOHYDRO ER capsules can cause rapid release and absorption of a potentially fatal dose of hydrocodone [see Warnings and Precautions (5.2)].

Accidental Ingestion
Accidental ingestion of even one dose of ZOHYDRO ER, especially by children, can result in a fatal overdose of hydrocodone [see Warnings and Precautions (5.2)].

Neonatal Opioid Withdrawal Syndrome
Prolonged use of ZOHYDRO ER during pregnancy can result in neonatal opioid withdrawal syndrome, which may be life-threatening if not recognized and treated, and requires management according to protocols developed by neonatology experts. If opioid use is required for a prolonged period in a pregnant woman, advise the patient of the risk of neonatal opioid withdrawal syndrome and ensure that appropriate treatment will be available [see Warnings and Precautions (5.3)].

Interaction with Alcohol
Instruct patients not to consume alcoholic beverages or use prescription or non-prescription products that contain alcohol while taking ZOHYDRO ER. The co-ingestion of alcohol with ZOHYDRO ER may result in increased plasma levels and a potentially fatal overdose of hydrocodone [see Warnings and Precautions (5.4) and Clinical Pharmacology (12.3)].

Cytochrome P450 3A4 Interaction
The concomitant use of ZOHYDRO ER with all cytochrome P450 3A4 inhibitors may result in an increase in hydrocodone plasma concentrations, which could increase or prolong adverse drug effects and may cause potentially fatal respiratory depression. In addition, discontinuation of a concomitantly used cytochrome P450 3A4 inducer may result in an increase in hydrocodone plasma concentration. Monitor patients receiving ZOHYDRO ER and any CYP3A4 inhibitor or inducer [see Warnings and Precautions (5.13) and Clinical Pharmacology (12.3)].

1 INDICATIONS AND USAGE

ZOHYDRO® ER (hydrocodone bitartrate) is indicated for the management of pain severe enough to require daily, around-the-clock, long-term opioid treatment and for which alternative treatment options are inadequate.

Limitations of Use

  • Because of the risks of addiction, abuse, and misuse with opioids, even at recommended doses, and because of the greater risks of overdose and death with extended-release opioid formulations, reserve ZOHYDRO ER for use in patients for whom alternative treatment options (e.g., non-opioid analgesics or immediate-release opioids) are ineffective, not tolerated, or would be otherwise inadequate to provide sufficient management of pain.
  • ZOHYDRO ER is not indicated as an as-needed (prn) analgesic.

2 DOSAGE AND ADMINISTRATION

2.1 Initial Dosing

ZOHYDRO ER should be prescribed only by healthcare professionals who are knowledgeable in the use of potent opioids for the management of chronic pain .

ZOHYDRO ER 50 mg capsules, a single dose of ZOHYDRO ER greater than 40 mg, or a total daily dose greater than 80 mg are only for use in patients in whom tolerance to an opioid of comparable potency has been established. Patients who are opioid tolerant are those receiving, for one week or longer, at least 60 mg oral morphine per day, 25 mcg transdermal fentanyl per hour, 30 mg oral oxycodone per day, 8 mg oral hydromorphone per day, 25 mg oral oxymorphone per day, or an equianalgesic dose of another opioid.

Initiate the dosing regimen for each patient individually, taking into account the patient’s prior analgesic treatment experience and risk factors for addiction, abuse, and misuse [see Warnings and Precautions (5.1)]. Monitor patients closely for respiratory depression, especially within the first 24-72 hours of initiating therapy with ZOHYDRO ER [see Warnings and Precautions (5.2)].

ZOHYDRO ER must be taken whole [see Patient Counseling Information (17)]. Crushing, chewing, or dissolving the beads in ZOHYDRO ER capsules will result in uncontrolled delivery of hydrocodone and can lead to overdose or death [see Warnings and Precautions (5.1)].

Use of ZOHYDRO ER as the First Opioid Analgesic
Initiate treatment with ZOHYDRO ER with one 10 mg capsule every 12 hours.

Use of ZOHYDRO ERin Patients Who Are Not Opioid Tolerant
The starting dose for patients who are not opioid tolerant is ZOHYDRO ER 10 mg orally every 12 hours. Patients who are opioid tolerant are those receiving, for one week or longer, at least 60 mg oral morphine per day, 25 mcg transdermal fentanyl per hour, 30 mg oral oxycodone per day, 8 mg oral hydromorphone per day, 25 mg oral oxymorphone per day, or an equianalgesic dose of another opioid.

Use of higher starting doses in patients who are not opioid tolerant may cause fatal respiratory depression.

Conversion from Other Oral Opioids to ZOHYDRO ER Discontinue all other around-the-clock opioid drugs when ZOHYDRO ER therapy is initiated.

While there are useful tables of opioid equivalents readily available, there is substantial inter-patient variability in the relative potency of different opioid drugs and products. As such, it is preferable to underestimate a patient’s 24-hour oral hydrocodone requirements and provide rescue medication (e.g., immediate-release opioid) than to overestimate the 24-hour oral hydrocodone requirements which could result in adverse reactions. In a ZOHYDRO ER clinical trial with an open label titration period, patients were converted from their prior opioid to ZOHYDRO ER using Table 1 as a guide for the initial ZOHYDRO ER dose.

Consider the following when using the information in Table 1:

  • This is not a table of equianalgesic doses.
  • The conversion factors in this table are only for the conversion from one of the listed oral opioid analgesics to ZOHYDRO ER.
  • The table cannot be used to convert from ZOHYDRO ER to another opioid. Doing so will result in an over-estimation of the dose of the new opioid and may result in fatal overdose.
Table 1. Conversion Factors to ZOHYDRO ER (Not Equianalgesic Doses)
Prior Oral Opioid Oral Dose (mg) Approximate Oral Conversion Factor
Hydrocodone 10 1
Oxycodone 10 1
Methadone 10 1
Oxymorphone 5 2
Hydromorphone 3.75 2.67
Morphine 15 0.67
Codeine 100 0.10
The conversion ratios in this table are only to be used for the conversion from current opioid therapy to ZOHYDRO ER.

To calculate the estimated daily ZOHYDRO ER dose using Table 1:

  • For patients on a single opioid, sum the current total daily dose of the opioid and then multiply the total daily dose by the conversion factor to calculate the approximate oral hydrocodone daily dose. The daily dose should then be divided in half for administration every 12 hours.
  • For patients on a regimen of more than one opioid, calculate the approximate oral hydrocodone dose for each opioid and sum the totals to obtain approximate total hydrocodone daily dose. The daily dose should then be divided in half for administration every 12 hours.
  • For patients on a regimen of fixed-ratio opioid/non-opioid analgesic products, use only the opioid component of these products in the conversion.

Always round the dose down, if necessary, to the appropriate ZOHYDRO ER strength(s) available.

Example conversion from a single opioid to ZOHYDRO ER

Step 1: Sum the total daily dose of the opioid (in this case, extended-release oxymorphone); 15 mg oxymorphone twice daily = 30 mg total daily dose of oxymorphone.

Step 2: Calculate the approximate equivalent dose of oral hydrocodone based on the total daily dose of the current opioid using Table 1; 30 mg total daily dose of oxymorphone x 2 = 60 mg of oral hydrocodone daily. The daily dose should then be divided in half for administration every 12 hours.

Step 3: Calculate the approximate starting dose which is 30 mg ZOHYDRO ER every 12 hours. Round down, if necessary, to the appropriate ZOHYDRO ER capsule strengths available. Close observation and frequent titration are warranted until pain management is stable on the new opioid. Monitor patients for signs and symptoms of opioid withdrawal or for signs of over-sedation/toxicity after converting patients to ZOHYDRO ER.

The dose of ZOHYDRO ER can be gradually adjusted preferably at increments of 10 mg every 12 hours every 3 to 7 days, until adequate pain relief and acceptable adverse reactions have been achieved.

Conversion from Methadone to ZOHYDRO ER
Close monitoring is of particular importance when converting from methadone to other opioid agonists. The ratio between methadone and other opioid agonists may vary widely as a function of previous dose exposure. Methadone has a long half-life and tends to accumulate in the plasma.

Conversion from Transdermal Fentanyl to ZOHYDRO ERZOHYDRO ER treatment can be initiated 18 hours following the removal of the transdermal fentanyl patch. Although there has been no systematic assessment of such conversion, a conservative hydrocodone dose, approximately 10 mg every 12 hours of ZOHYDRO ER, should be initially substituted for each 25 mcg/hr fentanyl transdermal patch. Follow the patient closely during conversion from transdermal fentanyl to ZOHYDRO ER, as there is limited documented experience with this conversion.

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