Hereditary transthyretin-mediated amyloidosis with stage 1 or stage 2 polyneuropathy

Active Ingredient: Patisiran

Indication for Patisiran

Population group: only adults (18 years old or older)
Therapeutic intent: Curative procedure

Patisiran is indicated for the treatment of hereditary transthyretin-mediated amyloidosis (hATTR amyloidosis) in adult patients with stage 1 or stage 2 polyneuropathy.

For this indication, competent medicine agencies globally authorize below treatments:

300 ug/kg body weight once every 3 weeks

For:

Dosage regimens

Regimen A: Intravenous, 300 micrograms patisiran per kilogram of body weight, once every 3 weeks.

Regimen B: In case that patient weight is ≥ 100 kg, intravenous, 300 micrograms patisiran per kilogram of body weight, once every 3 weeks. The maximum allowed total dose is 30,000 micrograms patisiran per kilogram of body weight every 3 weeks.

Detailed description

The recommended dose of patisiran is 300 micrograms per kg body weight administered via intravenous (IV) infusion once every 3 weeks.

Dosing is based on actual body weight. For patients weighing ≥100 kg, the maximum recommended dose is 30 mg.

Vitamin A supplementation at approximately 2500 IU vitamin A per day is advised for patients treated with patisiran.

Required premedication

All patients should receive premedication prior to patisiran administration to reduce the risk of infusion-related reactions (IRRs). Each of the following medicinal products should be given on the day of patisiran infusion at least 60 minutes prior to the start of infusion:

  • Intravenous corticosteroid (dexamethasone 10 mg, or equivalent)
  • Oral paracetamol (500 mg)
  • Intravenous H1 blocker (diphenhydramine 50 mg, or equivalent)
  • Intravenous H2 blocker (ranitidine 50 mg, or equivalent)

For premedications not available or not tolerated intravenously, equivalents may be administered orally.

If clinically indicated, the corticosteroid may be tapered in decrements no greater than 2.5 mg to a minimum dose of 5 mg of dexamethasone (IV), or equivalent. The patient should receive at least 3 consecutive IV infusions of patisiran without experiencing IRRs before each reduction in corticosteroid premedication.

Additional or higher doses of one or more of the premedications may be administered to reduce the risk of IRRs, if needed.

Missed dose

If a dose is missed, patisiran should be administered as soon as possible.

  • If patisiran is administered within 3 days of the missed dose, dosing should be continued according to the patient’s original schedule.
  • If patisiran is administered more than 3 days after the missed dose, dosing should be continued every 3 weeks thereafter.

Active ingredient

Patisiran

Patisiran is a double-stranded small interfering ribonucleic acid (siRNA) that specifically targets a genetically conserved sequence in the 3’ untranslated region of all mutant and wild-type TTR mRNA. Through a natural process called RNA interference (RNAi), patisiran causes the catalytic degradation of TTR mRNA in the liver, resulting in a reduction of serum TTR protein, a carrier of retinol binding protein which facilitates transport of vitamin A in the blood.

Read more about Patisiran

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