Written and medically reviewed by Dorcas Morak, Pharm.D
October is Breast Cancer Awareness Month, a time to spotlight early detection and the treatments that have transformed survival rates over the past few decades. Medications play a central role at nearly every stage of breast cancer care, from shrinking tumors before surgery to preventing recurrence years later. Understanding the different types of breast cancer medications and what to expect during treatment can help make conversations with your oncology team feel more manageable.
Types of Breast Cancer Medications
Breast cancer treatment often involves a combination of medications, including chemotherapy, hormone therapy, targeted therapy, immunotherapy, and supportive care medications. The right treatment plan depends on several factors, including the cancer's stage, hormone receptor status (ER/PR), HER2 status, genetic test results, and your overall health.
Do All Breast Cancer Patients Receive the Same Medications?
No. Every breast cancer treatment plan is personalized. Some patients may only need surgery followed by hormone therapy, while others receive chemotherapy, targeted therapy, immunotherapy, or a combination of treatments. Your oncology team will recommend medications based on the specific characteristics of your cancer and your individual treatment goals.
Chemotherapy Medications for Breast Cancer
Chemotherapy uses medications to destroy rapidly dividing cancer cells. It may be given before surgery (neoadjuvant chemotherapy) to shrink tumors or after surgery (adjuvant chemotherapy) to destroy any remaining cancer cells and reduce the risk of recurrence. Common chemotherapy medications include:
- Doxorubicin (Adriamycin)
- Cyclophosphamide
- Paclitaxel (Taxol)
- Albumin-bound paclitaxel (Abraxane)
- Docetaxel (Taxotere)
These medications are often used in combination and are typically given in treatment cycles over several months.
Hormone Therapy Medications for Breast Cancer
Hormone therapy blocks or lowers estrogen, helping prevent hormone receptor-positive breast cancers from growing. These cancers account for approximately two-thirds of all breast cancer diagnoses. Common hormone therapy medications include:
- Tamoxifen, often prescribed for premenopausal women
- Anastrozole (Arimidex)
- Letrozole (Femara)
- Exemestane (Aromasin)
The choice of medication depends largely on whether a patient has gone through menopause and their individual risk of recurrence.
How Long Do Patients Take Hormone Therapy?
Hormone therapy is commonly continued for five to ten years after initial treatment to help reduce the risk of breast cancer returning. Taking these medications consistently is one of the most effective ways to lower the risk of recurrence, so it's important to follow your treatment plan as directed.
Targeted Therapy Drugs for Breast Cancer
Targeted therapies attack specific proteins or genetic changes that help cancer cells grow while causing less damage to healthy cells than traditional chemotherapy. Examples include:
- Trastuzumab (Herceptin)
- Pertuzumab (Perjeta)
- Ado-trastuzumab emtansine (Kadcyla)
- Palbociclib (Ibrance)
- Ribociclib (Kisqali)
- Abemaciclib (Verzenio)
HER2-targeted therapies are used for HER2-positive breast cancers, while CDK4/6 inhibitors are commonly prescribed for certain hormone receptor-positive, HER2-negative breast cancers.
Immunotherapy Medications for Breast Cancer
Immunotherapy helps the immune system recognize and attack cancer cells. It is currently used primarily for certain patients with triple-negative breast cancer. Pembrolizumab (Keytruda) is the most commonly used immunotherapy medication for eligible patients and may be combined with chemotherapy before surgery and continued afterward in some treatment plans.
Medications That Help Manage Breast Cancer Treatment Side Effects
Supportive care medications help patients manage side effects and stay on schedule with treatment. Examples include:
- Ondansetron (Zofran) and prochlorperazine (Compazine) for nausea and vomiting
- Pegfilgrastim (Neulasta) and filgrastim (Neupogen) to help maintain healthy white blood cell counts
- Dexamethasone to help reduce inflammation and nausea
- Pain relievers, sleep medications, or anti-anxiety medications when appropriate
Your care team may adjust these medications throughout treatment based on your individual needs.
How Does Radiation Therapy Fit Alongside Medication?
Radiation therapy is not medication, but it is frequently used alongside drug treatment after surgery to destroy any remaining cancer cells and reduce the risk of recurrence. Some patients also use fragrance-free moisturizing creams, topical corticosteroids recommended by their healthcare team, or pain relievers to help manage radiation-related skin irritation and discomfort.
Long-Term Medications After Breast Cancer Treatment
Even after active treatment ends, some medications continue to play an important role in reducing the risk of recurrence and protecting long-term health. Hormone therapy may continue for several years, while certain patients remain on targeted therapies as part of their ongoing treatment plan. Some treatments can reduce bone density over time. To help protect bone health, your healthcare provider may recommend medications such as:
- Zoledronic acid (Zometa)
- Denosumab (Prolia or Xgeva, depending on the indication)
These medications may help strengthen bones and lower the risk of fractures in appropriate patients.
Common Side Effects of Breast Cancer Medications
Side effects vary depending on the medications used, but some of the most common include:
- Fatigue
- Hair loss (with many chemotherapy medications)
- Nausea and vomiting
- Joint or muscle pain
- Hot flashes
- Numbness or tingling in the hands and feet (peripheral neuropathy)
- Changes in bone density with long-term hormone therapy
Some targeted therapies may require periodic monitoring of heart function, while others may require liver function testing. Report any new or worsening symptoms to your healthcare team promptly so treatment can be adjusted if necessary.
Can Generic Medications Help Reduce Costs?
Several commonly prescribed breast cancer medications are available as lower-cost generic options, including tamoxifen, anastrozole, letrozole, exemestane, cyclophosphamide, and many supportive care medications such as ondansetron. Other treatments, including many newer targeted therapies and immunotherapies, may only be available as brand-name medications or biosimilars. Comparing prescription prices can help reduce out-of-pocket costs for eligible medications.
How Can the RxLess® Assurance Plan Help Lower Prescription Costs?
Breast cancer treatment can involve medications that are taken for months or even years, making prescription costs an ongoing concern for many patients. The RxLess® Assurance Plan helps patients save on FDA-approved prescription medications with free digital coupons accepted at more than 70,000 pharmacies nationwide. Before filling your prescription, use the free RxLess® app to compare prices at nearby pharmacies. Prescription prices can vary significantly from one pharmacy to another, and comparing prices may help you lower your out-of-pocket costs. Simply download the free RxLess® app to automatically become a member of the RxLess® Assurance Plan.
