Medical Oncologist
Fertility after targeted therapy
How Long Must You Wait — Before Trying to Conceive?
Wanting a child after cancer treatment is a real and legitimate hope. The answer depends on which targeted therapy you took — but for most agents, ASCO and ESMO recommend a minimum waiting period before attempting conception. Knowing the timeline early helps you plan.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed August 2026
- At least 6 months for most agents — ASCO and ESMO guidance sets this as the minimum interval after stopping most targeted therapies before trying to conceive.
- The drug sets the clock, not the diagnosis — Washout periods depend on how long a specific agent stays active in the body — your oncologist can give you the figure for your drug.
- Fertility preservation works best before treatment starts — If you have not yet begun targeted therapy and want children, tell your oncology team at the first appointment.
- The wait applies to men as well as women — Sperm produced during or shortly after targeted therapy may carry effects from the drug. Both partners should discuss timing with their team.
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)
ASCO and ESMO guidance recommends waiting at least 6 months after stopping most targeted therapies before trying to conceive. The exact period depends on which drug you took and how long it remains active in the body. If you have not yet started treatment and want children, tell your oncologist before your first dose.
Why does targeted therapy require a waiting period before conception?
Targeted therapy drugs work by interfering with specific proteins that cancer cells use to grow. Many of those same proteins are active during embryo development. That overlap is why exposure during early pregnancy can cause harm to a developing baby.
Most targeted agents have shown harm in animal studies. Human pregnancy data is limited because clinical trials exclude pregnant patients. Because the risk cannot be measured precisely, ASCO and ESMO treat all targeted agents as potentially harmful to a developing pregnancy.
The washout period is the time your body needs to clear the drug after you stop taking it. For most targeted therapies, ASCO and ESMO recommend at least 6 months as the minimum interval before attempting conception.
Does the waiting time differ depending on which targeted therapy you had?
| Drug category | Common cancers treated | Washout guidance | Evidence basis |
|---|---|---|---|
| Tyrosine kinase inhibitors (TKIs) | Lung, CML, thyroid, kidney | At least 6 months (ASCO, ESMO) | Animal teratogenicity data; limited human data |
| PARP inhibitors | Ovarian, breast, prostate | At least 6 months (ESMO) | Animal embryotoxicity; human data still emerging |
| CDK4/6 inhibitors | Breast cancer | At least 6 months; guidance evolving | Limited human pregnancy data available |
| Anti-VEGF / angiogenesis inhibitors | Colorectal, renal, liver | At least 6 months (ESMO) | VEGF pathway essential for placental formation |
| mTOR inhibitors | Renal, neuroendocrine | At least 6 months (ESMO) | Animal embryotoxicity; limited human data |
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.
Did you know?
Fertility preservation is most likely to succeed when it starts before your first dose of targeted therapy. Once treatment begins, some options are no longer available.
ASCO guidance states that every oncologist should discuss fertility with patients of reproductive age at the time of diagnosis — not after treatment has started.
Source: ASCO Clinical Practice Guideline: Fertility Preservation in Patients with Cancer
What else do families ask about timing and conception?
What exactly is a washout period, and how is it calculated?
A washout period is the time it takes for a drug to clear from your body after you stop taking it. It is based on the drug's half-life — the time it takes for half the remaining dose to leave your system. For most targeted agents, the drug itself clears within days, but the recommended 6-month interval adds a margin of safety for any lingering effects on egg or sperm quality, and for the critical window of embryo implantation and early organ formation.
Does the 6-month wait apply to men as well as women?
Yes. Sperm are produced continuously, and cells produced during targeted therapy exposure may carry drug-related effects. ASCO guidance recommends that men use effective contraception during treatment and for a period afterwards before attempting to father a pregnancy. The specific interval depends on the drug and should be confirmed with your oncologist. Men who want to preserve fertility should consider banking sperm before treatment begins — this is the most reliable option available.
What if you want to freeze eggs or embryos before starting treatment?
If you have not yet started treatment, this is the best time to discuss fertility preservation. Egg or embryo freezing requires a short stimulation cycle before the eggs are retrieved, and your oncologist and a fertility specialist can coordinate so that preservation is completed before your first dose. Tell your oncology team that fertility matters to you at the very first appointment — this changes the sequence of care and opens options that close once treatment begins.
Is it safe to try to conceive during targeted therapy?
No. Targeted therapy is not considered safe during an active pregnancy. Most agents carry animal data showing developmental harm, and ASCO and ESMO advise against conception during treatment. Highly effective contraception is recommended for all patients of reproductive age throughout the course of treatment. If you become pregnant during targeted therapy, contact your oncology team urgently — the situation requires specialist assessment and is different from the planned pregnancy this page describes.
Does the waiting period change if you plan to use IVF?
The washout period applies whether conception is natural or through IVF. IVF does not bypass the risks that drug exposure poses to egg quality, embryo development, or early placentation. If you froze eggs or embryos before treatment, your fertility specialist will advise when using them is appropriate in relation to your washout — and that timing should be confirmed with your oncologist before any cycle begins. Do not start a fertility treatment cycle before your oncologist confirms the washout is complete.
What if the cancer returns before the waiting period is over?
If treatment needs to restart before the washout is complete, conception should not be attempted. Your oncology team and your fertility specialist will discuss what this means for your plans — including whether previously frozen material can be held for longer, and whether a future treatment plan might allow a gap. This is a conversation worth having before it becomes urgent, ideally while you are in remission and the timing feels less pressured.
Explore 113 more Family, Fertility, Diet & Emotional Wellbeing topics
Fertility, Pregnancy & Sexual Health
- Accidental Pregnancy While on Targeted Therapy: What Now?
- Can You Breastfeed While on Targeted Therapy?
- Cancer Diagnosed During Pregnancy: Can Targeted Therapy Be Used?
- Contraception on Targeted Therapy: Which Methods Are Safe?
- Early Menopause Caused by Cancer Treatment
- Erectile Dysfunction and Sexual Changes in Men on Treatment
- Fertility After Long-Term Targeted Therapy: What the Data Shows
- Fertility Preservation Before Starting Treatment: Your Options and Timeline
- How Long Must You Wait Before Trying to Conceive?
- Sperm Banking Before Cancer Treatment: A Practical Guide
- Talking to Your Partner About Sex During Cancer Treatment
- Vaginal Dryness, Pain and Low Libido During Treatment
- Will Targeted Therapy Affect My Fertility?
Caregiver Enablement
- Building a Care Roster When One Person Can't Do It All
- Caregiver Burnout: Recognising It Before It Breaks You
- Caregiver Red Flag Chart: When to Take Them to Hospital
- Caring for an Elderly Parent on Oral Cancer Tablets
- Cooking for Someone on Targeted Therapy: A Kitchen Guide
- Coordinating Care From Abroad: A Guide for NRI Families
- Financial Management for Caregivers: Bills, Claims and Records
- How to Get a Second Opinion Without Offending Your Doctor
- How to Track Side Effects: A Simple Daily Diary System
- Managing Medicines, Refills and Pharmacy Runs
- Questions Every Caregiver Should Ask at the Oncology Visit
- Supporting Someone Emotionally Without Saying the Wrong Thing
- The Complete Caregiver's Guide to Targeted Therapy
- What to Do When the Patient Refuses to Take Their Medicine
Diet, Nutrition & Complementary Therapy
- Ayurveda Alongside Targeted Therapy: An Honest Assessment
- Do Immunity Boosters Help During Cancer Treatment?
- Does Sugar Feed Cancer? Separating Myth From Fact
- Eating With Mouth Sores: Foods That Don't Hurt
- Eating to Control High Blood Sugar From Cancer Drugs
- Food Safety and Hygiene for Cancer Patients at Home
- Foods to Avoid on Targeted Therapy
- How Much Protein Does a Cancer Patient Actually Need?
- Hydration: How Much Water and What Counts
- Is Cow's Milk, Soya or Non-Veg Food Safe During Cancer Treatment?
- Keto and Intermittent Fasting During Cancer Treatment: Is It Safe?
- Managing Weight Loss and Muscle Wasting
- What Should You Eat While on Targeted Therapy? A Practical Indian Diet Guide
- What to Eat When You Have Diarrhoea From Cancer Tablets
- Yoga and Pranayama During Cancer Treatment
Genetic Predisposition & Family Risk
- BRCA Testing in India: Cost, Process and Where to Get It Done
- Cascade Testing: Getting Your Family Members Tested
- Coping With the Anxiety of a Positive Genetic Test
- Does a BRCA Mutation Mean You Will Definitely Get Cancer?
- Family History of Cancer: Should You Get Genetic Testing?
- Genetic Counselling: What Actually Happens in the Session
- Hereditary Diffuse Gastric Cancer and the CDH1 Gene
- How to Tell Your Children and Siblings About a Genetic Risk
- I'm BRCA Positive but Have No Cancer: What Happens Now?
- IVF and Preimplantation Testing to Avoid Passing On a Mutation
- Li-Fraumeni Syndrome: Living With a TP53 Mutation
- Lynch Syndrome: Cancers, Screening and Treatment Implications
- MEN2, VHL and Other Endocrine Cancer Syndromes
- MUTYH, PALB2, ATM and CHEK2: Moderate-Risk Genes Explained
- Male BRCA Carriers: The Risks Nobody Talks About
- PARP Inhibitors: How a Genetic Mutation Becomes a Treatment Advantage
- Risk-Reducing Mastectomy: How to Decide
- Risk-Reducing Ovary and Tube Removal: Timing and Consequences
- Somatic Mutation Found on NGS: Could It Be Inherited?
- Surveillance Instead of Surgery: What Screening Looks Like
- Which Family Histories Actually Suggest a Hereditary Cancer Syndrome?
- Will a Genetic Test Result Affect Your Insurance in India?
Mental Health & Emotional Wellbeing
- Body Image When Your Skin, Nails and Hair Change
- Cancer Support Groups in India: How to Find One
- Depression During Long-Term Cancer Treatment
- Handling Unhelpful Advice and Toxic Positivity
- Living With Cancer as a Chronic Disease: A New Identity
- Sleep, Anxiety and Night-Time Fear During Treatment
- Talking to Your Children About Your Cancer Diagnosis
- Telling Friends, Relatives and Neighbours: How Much to Share
- The Fear That the Drug Will Stop Working: How to Live With It
- When Should You See a Psycho-Oncologist?
Myths, Misinformation & Verification
- Are Generic Cancer Drugs Fake or Weaker?
- Can Cancer Be Cured Without Any Modern Medicine?
- Cannabis and CBD Oil for Cancer: What the Evidence Actually Says
- Does Soursop, Apricot Seed or Alkaline Water Cure Cancer?
- Does a Biopsy Spread Cancer?
- How to Fact-Check Cancer Information You Read Online or From AI
- Miracle Cancer Cures on WhatsApp and YouTube: How to Spot a Fake
- Myth: Cancer Treatment Is Worse Than the Disease
- Myth: If the Scan Is Clear You Can Stop the Tablets
- Myth: Positive Thinking Cures Cancer
- Myth: Sugar, Milk or Non-Veg Food Feeds Cancer
- Myth: Targeted Therapy Has No Side Effects
- Myth: Targeted Therapy Is Only for the Rich
Palliative Care & End of Life
- Breathlessness and Comfort Care in Advanced Cancer
- Hospice and Home Palliative Care Services in India
- How to Have a Goals-of-Care Conversation With Your Doctor
- Pain Control at Home: What's Possible and What to Ask For
- Palliative Care Is Not Giving Up: Clearing the Biggest Myth
- Should You Ask How Long You Have Left?
- Supporting a Family Member in Their Last Months
- What 'Best Supportive Care' Actually Means
- When Is It Right to Stop Cancer Treatment?
Special Populations & Comorbidities
- Cancer Treatment After an Organ Transplant
- Cancer Treatment for Patients on Dialysis
- Cancer Treatment in Patients With Past or Active Tuberculosis
- Growth, Puberty and School During Childhood Cancer Treatment
- Hepatitis B and C Reactivation Risk During Cancer Treatment
- Managing Diabetes While on Targeted Therapy
- Obesity, Underweight and Dosing: Does Body Size Change the Dose?
- Paediatric Targeted Therapy: What Parents Need to Know
- Targeted Therapy With Autoimmune Disease
- Targeted Therapy With Chronic Kidney Disease
- Targeted Therapy With Existing Heart Disease
- Targeted Therapy With Liver Disease or Cirrhosis
- Targeted Therapy for Adolescents and Young Adults
- Targeted Therapy for Patients With Mental Illness or Dementia
- Targeted Therapy in HIV-Positive Patients
- Targeted Therapy in Patients Over 75: Is It Worth It?
- Treating Patients With Poor Performance Status
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
Does the 6-month wait apply equally to all targeted drugs?
The 6-month figure is the minimum ASCO and ESMO recommend for most targeted agents, but the interval for your specific drug may differ. Some drugs have longer half-lives or have raised more concern in animal studies, and your oncologist may advise waiting longer. Ask specifically about the drug you took, not the category — and get the answer in writing so there is no ambiguity when you see your fertility specialist.
What contraception is recommended during targeted therapy?
ASCO and ESMO recommend highly effective contraception throughout targeted therapy for all patients of reproductive age. The appropriate method depends on your specific drug, because some hormonal contraceptives interact with targeted agents. Ask your oncologist which methods are safe for your treatment — a general answer is less useful than the one specific to your drug.
Can targeted therapy permanently affect fertility?
Some targeted therapies reduce ovarian reserve or affect sperm quality while others do not. The risk depends on which drug you took, for how long, and at what dose. The only way to know where you stand is a fertility assessment after the washout period ends. A fertility specialist can measure ovarian reserve or sperm quality and give you a realistic picture before you begin trying.
Should we tell the fertility clinic about the cancer treatment?
Yes, and in full detail. The fertility team needs to know which targeted agent you took, when you started and stopped, and your oncologist's view of the washout period. Some fertility clinics have limited experience with post-oncology patients. Ask whether the clinic has an oncofertility programme or works regularly with oncology teams, and bring a copy of your treatment summary to the first appointment.
Is it safe to breastfeed after targeted therapy?
Most targeted therapies are not considered safe during breastfeeding, and many are excreted in breast milk. ASCO and ESMO advise against breastfeeding for patients still within the washout period or who need to restart treatment. If your washout is complete, discuss it with both your oncologist and your obstetric team — the answer varies by drug and by how long ago treatment ended.
What does an oncofertility specialist do that an oncologist cannot?
An oncofertility specialist is a fertility doctor trained to work with cancer patients. They understand how different treatments affect egg and sperm quality, how to time a preservation cycle around an oncology schedule, and what realistic expectations look like after different agents. If you want to try for a pregnancy after targeted therapy, asking for a referral to an oncofertility programme — ideally before treatment starts — is worth pursuing.