Swallow Irenka whole. Do not chew or crush. Do not open the capsule and sprinkle its contents on food or mix with liquids. All of these might affect the enteric coating. Irenka can be given without regard to meals. If a dose of Irenka is missed, take the missed dose as soon as it is remembered. If it is almost time for the next dose, skip the missed dose and take the next dose at the regular time. Do not take two doses of Irenka at the same time.
2.1 Dosage for Treatment of Major Depressive Disorder
Administer duloxetine at a total dose of 40 mg/day (given as 20 mg twice daily) to 60 mg/day (given either once daily or as 30 mg twice daily). For some patients, it may be desirable to start at 30 mg once daily for 1 week, to allow patients to adjust to the medication before increasing to 60 mg once daily. While a 120 mg/day dose was shown to be effective, there is no evidence that doses greater than 60 mg/day confer any additional benefits. The safety of doses above 120 mg/day has not been adequately evaluated. Periodically reassess to determine the need for maintenance treatment and the appropriate dose for such treatment [see CLINICAL STUDIES (14.1)].
2.2 Dosage for Treatment of Generalized Anxiety Disorder
Adults
For most patients, initiate duloxetine 60 mg once daily. For some patients, it may be desirable to start at 30 mg once daily for 1 week, to allow patients to adjust to the medication before increasing to 60 mg once daily. While a 120 mg once daily dose was shown to be effective, there is no evidence that doses greater than 60 mg/day confer additional benefit. Nevertheless, if a decision is made to increase the dose beyond 60 mg once daily, increase dose in increments of 30 mg once daily. The safety of doses above 120 mg once daily has not been adequately evaluated. Periodically reassess to determine the continued need for maintenance treatment and the appropriate dose for such treatment [see CLINICAL STUDIES (14.2)].
Elderly
Initiate duloxetine at a dose of 30 mg once daily for 2 weeks before considering an increase to the target dose of 60 mg. Thereafter, patients may benefit from doses above 60 mg once daily. If a decision is made to increase the dose beyond 60 mg once daily, increase dose in increments of 30 mg once daily. The maximum dose studied was 120 mg per day. Safety of doses above 120 mg once daily has not been adequately evaluated [see CLINICAL STUDIES (14.2)].
Children and Adolescents (7 to 17 years of age)
Initiate duloxetine at a dose of 30 mg once daily for 2 weeks before considering an increase to 60 mg. The recommended dose range is 30 to 60 mg once daily. Some patients may benefit from doses above 60 mg once daily. If a decision is made to increase the dose beyond 60 mg once daily, increase dose in increments of 30 mg once daily. The maximum dose studied was 120 mg per day. The safety of doses above 120 mg once daily has not been evaluated [see CLINICAL STUDIES (14.2)].
2.3 Dosage for Treatment of Diabetic Peripheral Neuropathic Pain
Administer duloxetine 60 mg once daily. There is no evidence that doses higher than 60 mg confer additional significant benefit and the higher dose is clearly less well tolerated [see CLINICAL STUDIES (14.3)]. For patients for whom tolerability is a concern, a lower starting dose may be considered.
Since diabetes is frequently complicated by renal disease, consider a lower starting dose and gradual increase in dose for patients with renal impairment [see DOSAGE AND ADMINISTRATION (2.6), USE IN SPECIFIC POPULATIONS (8.10), and CLINICAL PHARMACOLOGY (12.3)].
2.5 Dosage for Treatment of Chronic Musculoskeletal Pain
Administer duloxetine 60 mg once daily. Begin treatment at 30 mg for one week, to allow patients to adjust to the medication before increasing to 60 mg once daily. There is no evidence that higher doses confer additional benefit, even in patients who do not respond to a 60 mg dose, and higher doses are associated with a higher rate of adverse reactions [see CLINICAL STUDIES (14.5)].
2.6 Dosing in Special Populations
Hepatic Impairment
Avoid use in patients with chronic liver disease or cirrhosis [see WARNINGS AND PRECAUTIONS (5.14) and USE IN SPECIFIC POPULATIONS (8.9)].
Severe Renal Impairment
Avoid use in patients with severe renal impairment, GFR <30 mL/min [see WARNINGS AND PRECAUTIONS (5.14) and USE IN SPECIFIC POPULATIONS (8.10)].
2.7 Discontinuing Irenka
Adverse reactions after discontinuation of Irenka, after abrupt or tapered discontinuation, include: dizziness, headache, nausea, diarrhea, paresthesia, irritability, vomiting, insomnia, anxiety, hyperhidrosis, and fatigue. A gradual reduction in dosage rather than abrupt cessation is recommended whenever possible [see WARNINGS AND PRECAUTIONS (5.7)].
2.8 Switching a Patient to or from a Monoamine Oxidase Inhibitor (MAOI) Intended to Treat Psychiatric Disorders
At least 14 days should elapse between discontinuation of an MAOI intended to treat psychiatric disorders and initiation of therapy with Irenka. Conversely, at least 5 days should be allowed after stopping Irenka before starting an MAOI intended to treat psychiatric disorders [see CONTRAINDICATIONS (4)].
2.9 Use of Irenka with Other MAOIs such as Linezolid or Methylene Blue
Do not start Irenka in a patient who is being treated with linezolid or intravenous methylene blue because there is an increased risk of serotonin syndrome. In a patient who requires more urgent treatment of a psychiatric condition, other interventions, including hospitalization, should be considered [see CONTRAINDICATIONS (4)].
In some cases, a patient already receiving Irenka therapy may require urgent treatment with linezolid or intravenous methylene blue. If acceptable alternatives to linezolid or intravenous methylene blue treatment are not available and the potential benefits of linezolid or intravenous methylene blue treatment are judged to outweigh the risks of serotonin syndrome in a particular patient, Irenka should be stopped promptly, and linezolid or intravenous methylene blue can be administered. The patient should be monitored for symptoms of serotonin syndrome for 5 days or until 24 hours after the last dose of linezolid or intravenous methylene blue, whichever comes first. Therapy with Irenka may be resumed 24 hours after the last dose of linezolid or intravenous methylene blue [see WARNINGS AND PRECAUTIONS (5.4)].
The risk of administering methylene blue by non-intravenous routes (such as oral tablets or by local injection) or in intravenous doses much lower than 1 mg/kg with Irenka is unclear. The clinician should, nevertheless, be aware of the possibility of emergent symptoms of serotonin syndrome with such use [see WARNINGS AND PRECAUTIONS (5.4)].