Enhertu (Trastuzumab Deruxtecan)

Prescription medicineOnly Available By Prescription

What if I find a lower price with another pharmacy?

We guarantee the lowest price on all of our prescription products. If you find your medications cheaper at any other recognized licensed mail order pharmacy, we will not only match their price, we will beat it by 25% of the difference. It is our 125% price match guarantee!

Example: If you find a product on Canada Drugs Direct for $50.00 and find the same product for $40.00 at another mail order pharmacy, we will provide you with a $12.50 discount, bringing your total to $37.50.

To get the discount please make sure to mention the price match to the customer service team when they call to collect payment for your order. Or call toll free at 1-888-904-8467 to place the order through the phone.

Terms & Conditions of Program

  • Guaranteed lowest price is only valid at the time of sale.
  • We will only match the current advertised price.
  • Products must be identical and in stock at the time of placing an order with a licensed mail order pharmacy. They must be an online Canadian pharmacy with an address in Canada.
  • Products must be authentic in brand and size (same manufacturer, same country of manufacture, same pack size, same strength and same quantity).
  • Products must be new. We cannot match the price of any used, short expiry or expired product.
  • Price match can only be issued over the phone with our customer service team. Please note at this time we cannot offer price matching for the products Ozempic or Saxenda.
What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.

Description

Enhertu (trastuzumab deruxtecan) is an antibody-drug conjugate (ADC) composed of a humanized anti-HER2 monoclonal antibody linked to a topoisomerase I inhibitor. It is indicated for the treatment of adult patients with HER2-positive or HER2-low breast cancer, HER2-positive gastric or gastroesophageal junction adenocarcinoma, and other HER2-expressing solid tumors as approved indications evolve. Enhertu delivers cytotoxic chemotherapy directly to HER2-expressing cancer cells, leveraging targeted delivery to maximize efficacy and minimize off-target toxicity. It has demonstrated significant clinical benefit in patients with heavily pretreated or refractory cancers.

Fact Table

Formula

Not applicable (antibody-drug conjugate)

License

US FDA (2019)

Bioavailability

Not applicable (IV only)

Legal status

Prescription only

Chemical Name

Trastuzumab deruxtecan

Elimination half-life

~6 days

Dosage (Strength)

100 mg lyophilized powder per vial; typical dose: 5.4 mg/kg IV every 3 weeks

Pregnancy

Contraindicated – may cause fetal harm

Brands

Enhertu

Protein binding

Not applicable (monoclonal antibody)

PubChem CID

121304016

MedlinePlus

a621057

ChEBI

N/A

ATC code

L01FG03

DrugBank

DB15082

KEGG

D11968

Routes of administration

Intravenous (IV)

Directions

Enhertu is administered via intravenous infusion once every three weeks (21-day cycle). The recommended dose is 5.4 mg/kg for breast cancer and 6.4 mg/kg for gastric cancer, adjusted as needed based on tolerability and clinical response. The first infusion should be given over 90 minutes; if well tolerated, subsequent doses may be infused over 30 minutes. Premedication may be used to prevent infusion reactions. Dose reductions, delays, or discontinuation may be required for adverse events, particularly hematologic toxicity or interstitial lung disease (ILD).

Ingredients

Each Enhertu vial contains:

  • Trastuzumab deruxtecan-nxki (100 mg per vial)
  • Other excipients include:
  • L-histidine, L-histidine hydrochloride monohydrate, polysorbate 80, sucrose, and water for injection (following reconstitution and dilution according to labeling)

Contraindications

Enhertu is contraindicated in patients with:

  • Known hypersensitivity to trastuzumab, deruxtecan, or any component of the formulation
  • Severe hypersensitivity or anaphylaxis to prior HER2-directed therapies, unless under careful medical supervision

Cautions

Enhertu carries a boxed warning for interstitial lung disease (ILD) and pneumonitis, which may be fatal. All patients should be monitored for signs of pulmonary toxicity, including cough, dyspnea, and new radiographic findings. Prompt dose interruption and corticosteroid treatment are warranted for suspected ILD. Neutropenia, anemia, and left ventricular dysfunction have been reported and require regular monitoring. Effective contraception is required during treatment and for at least 7 months after the last dose in women of childbearing potential, and for 4 months in male partners. Enhertu is not recommended during pregnancy or breastfeeding.

Side Effects

Common and potential side effects include:

  • Nausea and vomiting
  • Fatigue
  • Alopecia
  • Constipation
  • Decreased appetite
  • Anemia and neutropenia
  • Interstitial lung disease or pneumonitis
  • Infusion-related reactions
  • Left ventricular dysfunction (rare)

IMPORTANT NOTE: The information provided above is for general awareness and educational purposes only. It is not intended to diagnose, treat, or replace professional medical or veterinary advice. Always consult your physician, pharmacist, or veterinarian regarding the safety, suitability, and proper use of any medication for yourself or your pet.

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