Used for Cancer

Are you tired of high medication costs? Our service offers unbeatable savings on your trastuzumab prescription medication. We provide a range of solutions to help you save up to 100% on your medication costs*. Whether you are insured, uninsured, underinsured, or simply looking to reduce your out-of-pocket expenses, we've got you covered.

Manufactured by various FDA-approved generic manufacturers.

*You can pay as little as $0 per fill using Drug Coupons or Patient Assistance Programs. Subject to applicability & eligibility requirements.

This content is intended for US audiences only

trastuzumab cost saving options available to you

  • Qualified

    Rx Advantage Card

    NowPatient's Rx Advantage card is a simple & convenient way to save money on your trastuzumab

    You can save up to 90%

  • Unavailable

    Canadian Prescription Savings

    Manufactured by
    Powered by
    Buy your trastuzumab without insurance from Canada at discounts of up to 90% using NowPatient's Canadian Prescription savings program.
  • Unavailable

    Drug Coupons

    Obtain your trastuzumab for as little as $0 per fill. Suitable for insured individuals only.
  • Unavailable

    Patient Assistance Programs

    Obtain your trastuzumab at no cost. Suitable for insured, underinsured and uninsured individuals

How it works

How to Lower Your Drug Costs

  • swoosh
    View programs

    View the savings programs that are available

  • swoosh
    Select program

    Pick the program that is suitable for you

  • swoosh

    If required, complete the online qualification check

  • swoosh
    Start Saving

    Enroll & Start Saving



Why Choose Our Service?

  • black dot icon

    Comprehensive Coverage

    Our service covers a wide range of medications, ensuring you can find savings on almost any prescription.

  • emoji icon

    Easy to Use

    Our website is user-friendly, allowing you to quickly find and apply discounts.

  • check icon

    Trusted by Many

    Thousands of users trust us to help them save on their medication costs every day.


Start Saving Today!

Lower the cost of your trastuzumab prescription

Join the many satisfied customers who have already benefited from our prescription discount service.

trastuzumab Uses, Side Effects, Interactions, Warnings & Dosing

What dosages is trastuzumab available in?

What dosages is trastuzumab available in?

trastuzumab is available as a 440 mg multidose vial.

What is trastuzumab used for?

What is trastuzumab used for?

trastuzumab is a monoclonal antibody that is used to treat:

  • HER2-positive, breast cancers – IV and SQ injections
  • HER2-positive, metastatic stomach cancer – IV injection only
How does trastuzumab work?

How does trastuzumab work?

trastuzumab is a monoclonal antibody that acts as a human epidermal growth factor receptor 2 (HER2) inhibitor. It blocks a specific protein in the body that’s important for cell growth called HER2. HER2 is found on both normal and cancer cells. Cancer cells usually have more HER2 proteins than normal cells. This can cause cancer cells to grow more quickly than normal cells. When HER2 is blocked by trastuzumab, cancer cells can’t grow and spread as well.

How do I take trastuzumab?

How do I take trastuzumab?

trastuzumab is given by a healthcare provider as an injection into a vein (IV) or as an injection under the skin (subcutaneous, SQ). When given IV, the dose depends on your body weight. Your healthcare provider will determine the appropriate dose for you each time you receive the medication.

HER2-positive, breast cancers

  • IV injection: The typical dose is 4 mg/kg of bodyweight IV for the first injection, and then 2 mg/kg given once a week. It can also be given as 8 mg/kg for the first injection, and then 6 mg/kg every 3 weeks thereafter
  • SQ injection (trastuzumab Hylecta brand only): trastuzumab Hylecta for injection under the skin contains trastuzumab and hyaluronidase. The typical dose is 600 mg/10,000 units (trastuzumab/hyaluronidase) given under the skin every 3 weeks. The SQ injection is a flat dose and isn’t dependent on weight.
  • HER2-positive, metastatic stomach cancer: The typical dose is 8 mg/kg IV for the first injection, and then 6 mg/kg every 3 weeks thereafter
Is it safe for me to take trastuzumab?

Is it safe for me to take trastuzumab?

trastuzumab is a safe and effective treatment when used for FDA licensed indications. However, like all medications, they may give you unwanted side effects. You should always discuss potential side effects with your physician to ensure the medication is suitable and right for you.

trastuzumab Common Side Effects

trastuzumab Common Side Effects

Common side effects of trastuzumab:

  • Body and joint pain
  • Weakness
  • Fever
  • Nausea
  • Chills
  • Headache
  • Cough
  • Diarrhea
  • Vomiting
  • Infection
trastuzumab Serious Side Effects

trastuzumab Serious Side Effects

Serious side effects are rare with trastuzumab. Contact your healthcare provider immediately if you experience any of the following.

  • Heart problems: chest pain, racing heartbeat, shortness of breath that usually worsens with activity or while lying flat, swelling of your legs or feet, sudden weight gain, fatigue
  • Serious infusion reactions: trouble breathing, itching or hives, flushing, swelling, chest pain, fast heartbeat, dizziness, fainting
  • Lung problems: shortness of breath, trouble breathing
  • Serious infections (when receiving in combination with chemotherapy): repeated fevers, chills, sweating, cough, trouble breathing, severe diarrhea, vomiting, painful or frequent urination
Effects of other drugs, drug classes and over-the-counter products on trastuzumab

Effects of other drugs, drug classes and over-the-counter products on trastuzumab

  • There are no major drug interactions listed for trastuzumab. However, always let your physician and pharmacist know about any other medications or supplements (including prescribed and over-the-counter medications, vitamins, and dietary or herbal supplements) that you are currently taking
Who makes trastuzumab?

Who makes trastuzumab?

Various FDA-approved generic manufacturers

Is trastuzumab safe in pregnancy?

Is trastuzumab safe in pregnancy?

trastuzumab can cause embryo-fetal harm when administered during pregnancy. Females of reproductive potential to use effective contraception during treatment with trastuzumab and for 7 months following the last dose of trastuzumab.
There is a pregnancy pharmacovigilance program for trastuzumab. If trastuzumab is administered during pregnancy, or if a patient becomes pregnant while receiving trastuzumab or within 7 months following the last dose of trastuzumab, health care providers and patients should immediately report trastuzumab exposure to Genentech at 1-888-835-2555.


What to do if you missed your trastuzumab dose

The FDA's medical product safety reporting program for health professionals, patients and consumers.

Learn more about reporting side effects
dollar sign

Drug Savings Tips

Medical Disclaimer

NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information on this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

FAQ logo

Things to know

Now Patient Data Security

Data Security

Our Commitment to You.

Find out moreNow Patient Data SecurityNow Patient Data Security

What is NowPatient

Online Pharmacy & Telehealth

NowPatient is an online pharmacy & telehealth service that is available in the US and UK. Our service is FREE and packed with useful features that can help you save money on the cost of your medications, access virtual treatments, and provide tools that can help improve your overall health.  Get started today and benefit from medication reminders, private treatment plans, NHS online pharmacy, GP appointment booking, Rx savings card, Drug Coupons, US drug savings programs, health conditions information, Drug Information, genetic testing, home test kits, BMI Risks, Type 2 Diabetes Riskspollen meter, air quality monitor, and lots more!

A laptop screen displays a dashboard with various health metrics and notifications. Widgets include drug coupons, home health testing, genetic risk, diabetes risk, BMI, pollen meter, and air quality.


To improve the lives of everyone by making high-quality care accessible and convenient

We are here to improve lives. Our service gives you access to smart features and resources that can help empower you to take control of your health and improve your health outcomes. All this, in one place, for FREE. We strive to bring a fresh perspective to managing health. NowPatient can be accessed by downloading the App or using your web browser.

Download our app today

A collage showing a map with pharmacies, a questionnaire, medication details, and a person video chatting on a screen.

Can I trust NowPatient

Meet our medical team

We are a passionate group of clinicians and medical writers covering a broad range of specialities with experience operating in health systems in the United Kingdom & United States. Providing excellent care and advice is at the heart of everything we do. You can read more about our medical team by visiting the medical team page or learn more about how we curate content by visiting our editorial process

Your Questions Answered

For your peace of mind, we can answer your questions quickly

We have a comprehensive list of FAQ’s on each feature page. Alternatively, for broader questions around our service just click the button below.
Find your answers