dimethyl fumarate

General

Pronunciation:
dye-meth-il fue-ma-rate


Trade Name(s)

  • Tecfidera

Ther. Class.
anti-multiple sclerosis agents

Indications

Treatment of relapsing forms of multiple sclerosis.

Action

Activates nuclear factor (Nrf2) pathway involved in cellular response to oxidative stress.

Therapeutic Effect(s):

Decreased incidence/severity of relapse with decreased progression of lesions and disability.

Pharmacokinetics

Absorption: Following oral administration rapidly converted to active metabolite monomethyl fumarate (MMF) by enzymes in GI tract, blood, and tissue.

Distribution: Unknown.

Metabolism and Excretion: MMF is metabolized by the tricarboxylic acid (TCA) cycle. 60% eliminated via exhalation of CO2. Minor amounts eliminated by renal (16%) and fecal (1%) routes, trace amounts in urine.

Half-life: MMF–1 hr

TIME/ACTION PROFILE (effects on disability)

ROUTEONSETPEAKDURATION
PO24 wk60 wkUnknown

Contraindication/Precautions

Contraindicated in:

  • Hypersensitivity.

Use Cautiously in:

  • Serious infections (treatment may be withheld);
  • OB: Use during pregnancy only if potential benefit justifies potential risk to fetus;
  • Lactation: Use cautiously if breast feeding;
  • Pedi: Safety and effectiveness not established.

Adverse Reactions/Side Effects

CNS: PROGRESSIVE MULTIFOCAL LEUKOENCEPHALOPATHY (PML)

GI: HEPATOTOXICITY, abdominal pain, diarrhea, nausea, dyspepsia, ↑ liver enzymes, vomiting

Derm: flushing, erythema, pruritus, rash

Hemat: lymphopenia

Misc: HYPERSENSITIVITY REACTIONS INCLUDING ANAPHYLAXIS AND ANGIOEDEMA

* CAPITALS indicate life-threatening.
Underline indicate most frequent.

Interactions

Drug-Drug

None noted.

Route/Dosage

PO: (Adults) 120 mg twice daily for one week, then 240 mg twice daily.

Availability

Extended-release capsules: 120 mg, 240 mg

Assessment

  • Monitor for signs and symptoms of infections (fever, sore throat). Consider withholding medication until serious infections are resolved.
  • Monitor for signs and symptoms of PML (progressive weakness on one side of body or clumsiness of limbs, disturbance of vision, changes in thinking, memory, and orientation causing confusion and personality changes). Symptoms are diverse, progress over days to weeks. Withhold medication and obtain diagnostic evaluation.

Lab Test Considerations:

Monitor CBC with lymphocyte count before initiating therapy, after 6 mo, and every 6 to 12 mo thereafter. If lymphocyte count is <0.5 × 109/L for >6 mo, consider interrupting therapy. Consider withholding therapy for patients with serious infections.

  • Obtain serum aminotransferase, alkaline phosphatase, and total bilirubin levels prior to starting therapy and as clinically indicated. May cause ↑ hepatic transaminases. Discontinue therapy if clinically significant liver injury is suspected.
  • May cause transient ↑ mean eosinophil count during first 2 mo of therapy.

Potential Diagnoses

Implementation

  • PO: Administer 120 mg twice daily for 7 days then increase to maintenance dose of 240 mg twice daily without regard to food. For patients with difficulty tolerating maintenance dose, may temporarily decrease to 120 mg twice daily; resume maintenance dose within 4 wks. Swallow capsules whole; do not open, crush, chew, or sprinkle on food. Discard any unused capsules 90 days after opening.

Patient/Family Teaching

  • Instruct patient to take dimethyl fumarate as directed. Advise patient to read Patient Information before starting therapy and with each Rx refill in case of changes.
  • Caution patient not to share medication with others, even if they have the same symptoms; may be dangerous.
  • May cause flushing (warmth, redness, itching, and/or burning sensation). Usually begins after starting and resolves over time. Administration of dimethyl fumarate with food or administration of non-enteric coated aspirin (up to a dose of 325 mg) 30 minutes prior to dimethyl fumarate dosing may decrease incidence or severity of flushing.
  • Advise patient to notify health care professional promptly if signs and symptoms of PML (new or worsening weakness; trouble using their arms or legs; or changes to thinking, eyesight, strength or balance) or hypersensitivity reactions (difficulty breathing, urticaria, swelling of throat and tongue) occur.
  • Advise patient to notify health care professional of all Rx or OTC medications, vitamins, or herbal products being taken and to consult with health care professional before taking other medications.
  • Rep: Advise female patient to notify health care professional if pregnancy is planned or suspected, or if breast feeding. Patients who become pregnant should be encouraged to join the pregnancy registry by calling 1-866-810-1462 or visiting www.tecfiderapregnancyregistry.com.

Evaluation/Desired Outcomes

Decreased incidence/severity of relapse of multiple sclerosis.

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