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Pharmacologic class: Piperazinoazepine derivative
Therapeutic class: Tetracyclic antidepressant
Pregnancy risk category C
FDA Box Warning
• Drug may increase risk of suicidal thinking and behavior in children and adolescents with major depressive disorder and other psychiatric disorders. Risk must be balanced with clinical need, as depression itself increases suicide risk. With patient of any age, observe closely for clinical worsening, suicidality, and unusual behavior changes when therapy begins. Advise family and caregivers to observe patient closely and communicate with prescriber as needed.
• Drug isn't approved for use in pediatric patients.
Potentiates effects of norepinephrine and serotonin by blocking their synaptic reuptake. Also exerts anticholinergic activity by disrupting muscarinic receptors.
Tablets: 15 mg, 30 mg, 45 mg
Tablets (orally disintegrating): 15 mg, 30 mg, 45 mg
Indications and dosages
Adults: Initially, 15 mg/day as a single dose at bedtime; may increase dosage q 1 to 2 weeks up to 45 mg/day. For maintenance, 15 to 45 mg/day.
• Renal or hepatic impairment
• Elderly patients
• Hypersensitivity to drug
• MAO inhibitor use within past 14 days
Use cautiously in:
• hepatic or renal impairment
• history of seizures, cardiovascular or cerebrovascular disease, or psychiatric illness
• elderly patients
• pregnant or breastfeeding patients
• children (safety not established).
• Administer orally disintegrating tablet without water. Have patient place it on tongue until it melts. Make sure tablet isn't broken.
• Be aware that drug is usually used in conjunction with psychotherapy.
☞ Don't give within 14 days of MAO inhibitors.
CNS: drowsiness, dizziness, abnormal dreams, abnormal thinking, asthenia, tremor, confusion, suicidal behavior or ideation (especially in child or adolescent)
CV: orthostatic hypotension, chest pain
GI: constipation, dry mouth
GU: urinary frequency, urinary tract infection
Musculoskeletal: back pain, myalgia
Respiratory: increased cough, dyspnea
Other: flulike symptoms, edema, increased appetite, weight gain, increased thirst
Drug-drug. Benzodiazepines, other CNS depressants: additive CNS depression
Drugs metabolized by CYP450 enzyme: altered metabolism of these drugs
MAO inhibitors: hypertension, seizures, death
Drug-diagnostic tests. Alanine aminotransferase, cholesterol, triglycerides: increased levels
Drug-herbs. Chamomile, hops, kava, skullcap, valerian: increased CNS depression
S-adenosylmethionine (SAM-e), St. John's wort: increased risk of serotonergic adverse effects (including serotonin syndrome)
Drug-behaviors. Alcohol use: additive CNS effects
• Monitor vital signs, especially for orthostatic hypotension.
• Assess neurologic status.
• Watch for weight gain caused by edema or increased appetite.
• Stay alert for urinary tract infection, sinusitis, and flulike symptoms.
☞ Monitor CBC with white cell differential. Stay alert for agranulocytosis.
☞ Watch for suicidal behavior or ideation (especially in child or adolescent).
• Advise patient to take with food or milk to reduce GI upset.
• Tell patient he may crush conventional tablets if he can't swallow them whole.
• Instruct patient to take orally disintegrating tablet without water. Tell him to place it on tongue until it melts and to make sure tablet isn't broken.
• Advise patient that therapeutic effects may take 2 to 3 weeks.
☞ Tell patient to immediately report sore throat, fever, mouth sores, or other signs or symptoms of infection.
☞ Instruct patient (or parent) to immediately report suicidal thoughts or actions (especially in child or adolescent).
☞ Caution patient not to discontinue drug abruptly. Dosage must be tapered.
• If drug causes oversedation, tell patient to consult prescriber about taking entire daily dose at bedtime.
• Caution patient to avoid driving and other hazardous activities until he knows how drug affects concentration and alertness.
• Tell patient to avoid alcohol and to discuss herbal use with prescriber.
• Instruct patient to avoid exposure to excessive sunlight or sun lamps.
• As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs, tests, herbs, and behaviors mentioned above.
mirtazapine/mir·taz·a·pine/ (mir″taz-ah-pēn) an antidepressant structurally unrelated to any of the classes of antidepressants.
mirtazapineA psychoactive agent of the benzazepine and tetracyclic antidepressant (TeCA) chemical classes, which is used primarily for moderate to severe clinical depression, but also as an anxiolytic, hypnotic, antiemetic, orexigenic, antihistaminic or antipruritic.
Dizziness, blurred vision, sedation, drowsiness, malaise or lassitude, hyperphagia and subsequent weight gain.
Rare (1:1000 patients) adverse effects
Allergic reaction, oedema, syncope, seizures, myelotoxicity, myelodysplasia, agranulocytosis.