Medical Oncologist
Enhertu side effects
Breathing Changes on Enhertu: — When You Cannot Wait Until Your Next Appointment
Interstitial lung disease is the side effect your oncology team watches most closely on Enhertu. It does not always announce itself loudly. A new cough, a slight increase in breathlessness, or an unexplained fever are signals to act on today — not at your next visit.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed August 2026
- ILD can be life-threatening — Fatal ILD-related events have been reported in clinical trials of Enhertu. Early reporting changes outcomes.
- Symptoms can begin subtly — A new dry cough or reduced exercise tolerance may be the only early sign. Both are worth reporting the same day.
- No home management exists — Unlike nausea or fatigue, ILD cannot be managed at home. It needs assessment and imaging before any plan is made.
- Caught early, it is more treatable — Most patients whose ILD is identified at an early stage can be managed effectively. Delay is what makes the difference.
17+
Cancer Specialists
on Panel
on Panel
96.9%
Breast Cancer
Survival Rate*
Survival Rate*
15,000+
Patients
Treated
Treated
4.8★
Google Rating
(800+ reviews)
(800+ reviews)
Interstitial lung disease on Enhertu is the side effect your team monitors most closely. It can be serious and, in some patients, life-threatening. NCCN and ASCO guidance treats any new respiratory symptom — cough, breathlessness, chest discomfort, or fever — as needing same-day assessment. Do not wait for your next scheduled visit.
How do you tell early ILD from an ordinary chest infection?
| Feature | Call your team today | Go to hospital now |
|---|---|---|
| Breathlessness | New, only on exertion, mild | Present at rest, worsening fast, or stopping you mid-sentence |
| Cough | New dry cough with no cold to explain it | Persistent, worsening day on day, or with any blood |
| Fever | Low-grade, no other symptoms | High, or any fever alongside new breathing difficulty |
| Exercise tolerance | Noticeable drop from your usual — shorter distances, more rest stops | Cannot manage ordinary activity without stopping |
| Chest symptoms | Slight tightness, easy to dismiss | Pain, tightness with breathlessness, or a pressure feeling |
| Typically starts | Any point during treatment — weeks to months in, or even after the last dose | Onset timing is the same; severity is what determines which column applies |
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Interventional Radiologist
Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
You do not have to work this out alone
A 45-minute consultation with a specialist who treats this every week.
Is there anything you can do at home while you wait?
No — and this matters. ILD is not a side effect you can manage at home with rest and fluids the way you might manage nausea.
If you have new respiratory symptoms on Enhertu, call your oncology team the same day. They will decide whether you need a chest X-ray, a CT scan, or an urgent in-person review before any other plan is made.
Do not take over-the-counter cough medicines or inhalers that have not been prescribed for you. They do not treat ILD, and they can make it harder for your team to assess what is actually happening.
If your symptoms worsen and you cannot reach your team, go to the emergency department and tell them you are on trastuzumab deruxtecan.
What should you do from today onwards?
- Know the symptoms to watch forNew cough, increased breathlessness, fever, or reduced exercise tolerance during treatment — any of these means call today, not at your next visit.
- Save your team's out-of-hours number nowKeep it somewhere easy to find. You do not want to search for it when you are breathless or unwell.
- Tell any emergency team what you are takingIf you go to any hospital other than your CION centre, say immediately that you are on trastuzumab deruxtecan (Enhertu). It affects how quickly they prioritise a chest assessment.
- Do not ignore a new mild coughEarly ILD can feel like a small thing. It is worth one phone call to find out whether it needs attention.
- Tell your team about all medicines and supplementsSome preparations interact with how the lungs respond to treatment. Tell your team everything you are taking, including herbal and traditional remedies.
Explore 75 more Breast Cancer Targeted Medicines topics
Drug Deep Dive: Trastuzumab Deruxtecan (Enhertu)
- Diet and Nutrition While on Trastuzumab Deruxtecan
- Drug, Food and Supplement Interactions With Trastuzumab Deruxtecan
- Enhertu Myths: 'It's Just Stronger Herceptin' and Cost Misconceptions
- Enhertu in Breast, Gastric and Lung Cancer: One Drug, Three Diseases
- Fertility, Pregnancy and Contraception on Trastuzumab Deruxtecan
- HER2-Low Breast Cancer: How Enhertu Created an Entirely New Patient Group
- How Does Trastuzumab Deruxtecan Work? The HER2-Directed Antibody-Drug Conjugate Explained
- How Long Does Trastuzumab Deruxtecan Take to Work?
- How Long Will You Stay on Trastuzumab Deruxtecan?
- Interstitial Lung Disease on Enhertu: The Side Effect That Needs Immediate Action
- Low Blood Counts, Hair Loss and Heart Monitoring on Enhertu
- Nausea and Vomiting on Trastuzumab Deruxtecan: Managing a High-Risk ADC
- Tests and Monitoring While You Are on Trastuzumab Deruxtecan
- Trastuzumab Deruxtecan (Enhertu): The Complete Patient Guide
- Trastuzumab Deruxtecan Infusion Day: Premedication, Duration and What to Expect
- Trastuzumab Deruxtecan Price in India: Innovator, Biosimilar and Cost Per Cycle
- Trastuzumab Deruxtecan Side Effects: The Complete List and Timeline
- Trastuzumab Deruxtecan Success Rate and Survival: An Honest Look at the Numbers
- Trastuzumab Deruxtecan in Elderly Patients and Those With Other Illnesses
- Trastuzumab Deruxtecan vs T-DM1 and Trastuzumab: How ADCs Differ
- When Trastuzumab Deruxtecan Stops Working: Resistance and What Comes Next
- Where Trastuzumab Deruxtecan Fits Alongside Chemotherapy and Hormone Therapy
- Who Is Eligible for Trastuzumab Deruxtecan? HER2-Positive and HER2-Low Breast, Gastric and Lung Cancer
- Will Insurance or a Government Scheme Pay for Trastuzumab Deruxtecan?
- Work, Travel and Daily Life on Trastuzumab Deruxtecan
Drug Deep Dive: Palbociclib (Ibrance)
- Diet and Nutrition While on Palbociclib
- Drug, Food and Supplement Interactions With Palbociclib
- Fatigue on Palbociclib: Why It Happens and What Genuinely Helps
- Fertility, Pregnancy and Contraception on Palbociclib
- How Does Palbociclib Work? The CDK4/6 Inhibitor Explained
- How Long Does Palbociclib Take to Work?
- How Long Will You Stay on Palbociclib?
- Low White Cell Count on Palbociclib: Expected, and Rarely Dangerous
- Mouth Sores and Infection Risk on Palbociclib
- Palbociclib (Ibrance, Palbace): The Complete Patient Guide
- Palbociclib Myths: Low Counts, Hair Loss and Stopping Early
- Palbociclib Price in India: Brand, Generic and Monthly Cost
- Palbociclib Side Effects: The Complete List and Timeline
- Palbociclib Success Rate and Survival: An Honest Look at the Numbers
- Palbociclib With Letrozole or Fulvestrant: Understanding Your Combination
- Palbociclib in Early Breast Cancer: Why It Is Not Given After Surgery
- Palbociclib in Elderly Patients and Those With Other Illnesses
- Palbociclib vs Ribociclib vs Abemaciclib: Which CDK4/6 Inhibitor?
- Taking Palbociclib: Food, Timing and What to Do If You Miss a Dose
- Tests and Monitoring While You Are on Palbociclib
- The 21-Days-On, 7-Days-Off Palbociclib Cycle Explained
- When Palbociclib Stops Working: Resistance and What Comes Next
- Who Is Eligible for Palbociclib? Hormone-Receptor-Positive, HER2-Negative Breast Cancer
- Will Insurance or a Government Scheme Pay for Palbociclib?
- Work, Travel and Daily Life on Palbociclib
Drug Deep Dive: Trastuzumab (Herceptin)
- Adjuvant Trastuzumab: Why Exactly 12 Months After Surgery?
- Diet and Nutrition While on Trastuzumab
- Drug, Food and Supplement Interactions With Trastuzumab
- Fatigue, Chills and Flu-Like Symptoms After a Trastuzumab Infusion
- Fertility, Pregnancy and Contraception on Trastuzumab
- Heart Function and Trastuzumab: Understanding Your ECHO Reports
- Herceptin vs Biosimilar Trastuzumab: Are They Really the Same?
- How Does Trastuzumab Work? The Anti-HER2 Monoclonal Antibody Explained
- How Long Does Trastuzumab Take to Work?
- How Long Will You Stay on Trastuzumab?
- Subcutaneous Trastuzumab vs IV Infusion: Which Suits You Better?
- Tests and Monitoring While You Are on Trastuzumab
- Trastuzumab (Herceptin and biosimilars): The Complete Patient Guide
- Trastuzumab Infusion Day: Premedication, Duration and What to Expect
- Trastuzumab Infusion Reactions: What Happens and How They're Managed
- Trastuzumab Myths: 'It's Chemotherapy' and Other Misunderstandings
- Trastuzumab Price in India: Innovator, Biosimilar and Cost Per Cycle
- Trastuzumab Side Effects: The Complete List and Timeline
- Trastuzumab Success Rate and Survival: An Honest Look at the Numbers
- Trastuzumab With Pertuzumab, Chemotherapy and Hormone Therapy
- Trastuzumab in Elderly Patients and Those With Other Illnesses
- When Trastuzumab Stops Working: Resistance and What Comes Next
- Who Is Eligible for Trastuzumab? HER2-Positive Breast and Gastric Cancer
- Will Insurance or a Government Scheme Pay for Trastuzumab?
- Work, Travel and Daily Life on Trastuzumab
Next step
Still not sure what applies to you?
Send your reports across and a senior medical oncologist will go through what they mean, what is known, and what the options actually are.
Common questions
Frequently asked questions
How soon after starting Enhertu does ILD usually appear?
ILD can appear at any point during treatment — weeks to months in — and has also been reported after the last dose. This differs from many chemotherapy side effects, which tend to follow a predictable pattern around each cycle. Because the timing is unpredictable, any new respiratory symptom should be reported whenever it appears, not only in the early weeks of treatment.
Will I have to stop Enhertu permanently if I get ILD?
Not always — it depends on how severe the reaction is. Mild ILD is typically managed by pausing the drug while treatment is given, and some patients restart successfully. More severe reactions generally mean Enhertu is stopped permanently. Your oncologist weighs that decision against how well the drug has been working for you. Reporting early is what keeps the milder options available — delay tends to make reactions harder to manage.
What does ILD feel like — how will I know if I have it?
The most common early signs are a new dry cough, feeling more breathless than usual on exertion, mild fever, and tiring more quickly than normal. These can feel similar to a chest infection or ordinary fatigue, which is what makes them easy to dismiss. The key question is whether something has changed from your usual pattern. If a respiratory symptom is new and appeared during Enhertu treatment, it is worth one call to your team to describe it.
Can ILD be prevented?
There is no proven way to prevent ILD on Enhertu. ASCO and NCCN guidance focuses on early detection through symptom monitoring and scheduled imaging, because catching it early is what most reliably changes the outcome. Avoiding respiratory irritants such as cigarette smoke, and reporting any new chest symptom promptly, are the practical steps your team will ask of you. We do not yet have strong evidence that any medicine prevents ILD from developing in the first place.
A CT scan showed ILD but I have no symptoms. Should treatment still stop?
That decision belongs to your oncologist, who will weigh the imaging findings against your overall treatment response and general health. Imaging-detected ILD is taken seriously even without symptoms, because it can progress. NCCN guidance addresses asymptomatic radiographic findings as a distinct clinical situation from symptomatic disease. Do not continue treatment without your oncologist reviewing the scan — and if the findings have not been explained clearly to you, ask for that conversation before your next dose.