Kadcyla is a prescription medication used as adjuvant (after surgery) therapy for HER2-positive early-stage breast cancer in patients who have already undergone neoadjuvant (before surgery) treatment with a taxane and trastuzumab (Herceptin®) and whose cancer has spread to the tissue that was surgically removed.

Patients are chosen for treatment based on a Kadcyla test that has been authorized by the FDA.

Use this medication precisely as recommended by your physician. Follow the prescription of your doctor carefully. 

The medication dose your physician has given is based on your condition, other medications or food supplements you may take, and your reaction to treatment. To diminish your risks for adverse effects, don’t increase your dosage, take it regularly, or take it as instructed by your physician. Adverse events may still happen even at usual prescription dosages. 

If your physician requests you to use this drug consistently, use it regularly to get the most benefits from it. To make you remember it better, take it at a fixed time every day. 

Your doctor may need to modify your dosages to ease your symptoms or if you develop adverse reactions. 

If you have any inquiries with regards to information, ask your physician or pharmacist.

Kadcyla is used in the following conditions:

  • HER2 +ve
  • Previously treated with trastuzumab and taxane in patients with unresectable locally advanced or metastatic breast cancer
  • Early breast cancer patients with HER2 positivity who had neoadjuvant taxane and despite trastuzumab-based therapy had invasive disease.

This medicine may be recommended for different uses. Approach your physician or pharmacist for more information.

Do not use Kadcyla in people with the following conditions:

  • Hypersensitivity

Kadcyla may have the following side effects:

  • Tiredness
  • Hands and feet discomfort, numbness, and weakness
  • Nausea
  • Bleeding
  • Liver issues
  • Headache
  • Pain in the tendons, ligaments, muscles, and bones
  • Aching joints
  • Low level of platelets

Keep in mind that your physician has recommended this drug since he or she has known that the advantage to you is more noteworthy than the risk of adverse reactions. Many individuals utilizing this medicine don’t have serious side effects.  

A serious allergy to this medication is uncommon. In any case, seek emergency medical help if you see any manifestations of a serious allergic response, including a rash, tingling or swelling particularly of the face or tongue or throat, dizziness or difficulty in breathing. 

This is not a complete list of side effects. If you see other effects not recorded above, contact your physician or pharmacist.

Take extra caution in patients with the following medical conditions:

  • Breast-feeding
  • Birth prevention
  • Children
  • Bleeding
  • Idiopathic pulmonary disease
  • Grogginess or diminished alertness
  • Liver performance
  • Heart activity
  • Pregnancy
  • Allergic response

Prior to taking this medicine, tell your physician or pharmacist if you are allergic to it, or if you have some other hypersensitivities. This drug may contain inert ingredients which can cause unfavorable side effects or different issues. Talk with your pharmacist for more information.


Kadcyla may interact with the following medicines:

  • Mesalamine
  • Anticancer drugs with anthracycline
  • Cancer treatment drugs
  • ‘Azole’ antifungal agents
  • Sulfasalazine
  • BCG
  • Vaccines
  • Ceritinib
  • Antibiotics with macrolides
  • Clozapine
  • Protease inhibitors for HIV
  • Cobicistat

Inform your physician about the drugs you take including over-the-counter medications, prescribed drugs, supplements and vitamins. 

This is not a complete list of drug interactions. Approach your physician or pharmacist for more details. 

The effects of certain medications can change if you consume different medications or herbal products simultaneously. This can build your risk for side effects or may cause your drugs not to work effectively. These interactions are conceivable, yet don’t generally happen. Your physician or pharmacist can prevent or oversee interactions by changing how you utilize your prescriptions or by close checking. 

While utilizing this drug, don’t start, stop, or change the dose of other medicines you are using without your physician’s advice. 

Symptoms of overdose may include the following: 

  • Flushing
  • Itching
  • Body rash
  • Throat, mouth, or tongue swelling that might restrict your breathing
  • Bulging skin below, usually in your lips, eyelids, feet, or hands

Seek medical help immediately. 

Available Brands:

  • Trastuzumab emtansine

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