Medical Oncologist
Family planning on Cetuximab
Fertility, Pregnancy and Contraception — on Cetuximab
Cetuximab can affect a developing baby. Before treatment starts — and for two months after it ends — there are specific steps you and your partner need to take. This page explains exactly what they are and when they apply.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Contraception is required — Both women and men on cetuximab must use effective contraception throughout treatment.
- Two months after your last dose — The contraception requirement continues for two months after cetuximab ends, not just during treatment.
- The rule applies to both partners — If you are male, the requirement applies to you too — not only to the female patient.
- Fertility preservation must be arranged early — If you want children after treatment, options exist — but they need to be discussed before the first dose.
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Cetuximab can harm a developing baby. Both women and men whose partners could become pregnant must use effective contraception during treatment and for two months after the last dose. If you are pregnant, planning to conceive, or breastfeeding, tell your oncologist before treatment begins — not after.
Do men need contraception on cetuximab too?
| Women of childbearing potential | Men with a partner who could become pregnant | |
|---|---|---|
| Contraception during treatment | Required — effective method throughout | Required — effective method throughout |
| Contraception after last dose | Two months minimum | Two months minimum |
| Pregnancy during this period | Not recommended — cetuximab can cross the placenta and harm fetal development | Partner pregnancy not recommended during treatment and for two months after |
| Breastfeeding | Not recommended during treatment and for two months after last dose | Not applicable |
| Fertility preservation | Discuss with your oncologist before starting | Discuss with your oncologist before starting |
What should I do before starting cetuximab?
- Tell your oncologist if you are pregnant, trying to conceive, or breastfeeding before treatment is discussed.
- If you are male, tell your oncologist if your partner could become pregnant — the contraception requirement applies to you too.
- Ask about fertility preservation before treatment begins. These options are much harder to arrange once treatment has started.
- Confirm that your contraception is effective, and plan to continue it for two months after your last dose.
- If your situation changes during treatment — a missed period, a positive pregnancy test — call your oncology team the same day.
- If you are considering stopping contraception before the two-month washout is complete, speak to your team first.
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Source: Erbitux (cetuximab) Summary of Product Characteristics, EMA; FDA Prescribing Information
What if I am pregnant, or want to have children after cetuximab?
I am already on cetuximab and I think I may be pregnant
Stop and tell your oncology team the same day — do not wait for your next scheduled appointment. The team will arrange an urgent pregnancy test and discuss what happens next with you. There is a pregnancy exposure registry for cetuximab, and your oncologist may refer you to it. What happens to treatment depends on your specific situation and how far along the pregnancy is. The most important thing is to tell your team immediately rather than making any decisions alone or waiting to see if the test is positive.
How long must I wait before trying to conceive after cetuximab ends?
The prescribing information sets two months after your last dose as the minimum washout period before conception is attempted. In practice, your oncologist will also consider your overall health, your response to treatment, and your disease status before advising you to try. Two months is the pharmacological minimum; the clinical advice may be longer. Ask your oncologist to give you a specific recommendation before you finish treatment, so you have a clear written answer rather than a general one to take away.
Does cetuximab permanently affect fertility?
Animal studies suggest cetuximab may impair fertility, particularly in women. However, cetuximab works very differently from chemotherapy agents such as alkylating drugs, which are the main cause of treatment-related infertility. The data in humans is limited, and the prescribing information reflects this by stating fertility effects may occur rather than that they will. If preserving fertility matters to you, discuss it with your oncologist before starting — a referral to a reproductive specialist can usually be arranged alongside your cancer treatment.
My partner is already pregnant — does that affect whether I can receive cetuximab?
If you are male and your partner is already pregnant, the situation is different from one where conception has not yet happened. The guidance on male contraception in the prescribing information is intended to prevent a pregnancy starting during and for two months after treatment. If your partner is already pregnant, discuss your specific situation with your oncologist rather than applying the general rule. The decision will take into account the stage of the pregnancy and the urgency of your treatment. Do not assume it is safe to proceed without that conversation.
Can I breastfeed while on cetuximab, or in the weeks after?
Breastfeeding is not recommended during cetuximab treatment or for two months after your last dose. Cetuximab is a large antibody molecule, and antibodies of this type can pass into breast milk. It is not established whether this would harm a breastfed baby, but because the potential for harm exists and the prescribing information advises against it, the two-month pause applies to breastfeeding as it does to contraception. If you have recently given birth and are planning to breastfeed, tell your oncologist before cetuximab is started.
Are some contraception methods more suitable than others on cetuximab?
The prescribing information specifies effective contraception but does not name a preferred method. Any reliably effective method — barrier methods, hormonal methods, an intrauterine device — meets the requirement. If you are already using one, confirm with your oncologist or gynaecologist that it is appropriate to continue while on treatment, since some patients have other factors that affect the best choice. The most important point is to use a method with a consistently high effectiveness rate, rather than one that depends heavily on perfect use every time.
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Common questions
Frequently asked questions
Why is two months the washout period and not shorter?
Two months is the period established in the cetuximab prescribing information based on the drug's pharmacology. Cetuximab is a large antibody molecule that remains in the body considerably longer than small-molecule drugs. The two-month period is designed to allow the drug to clear to a level where the risk to a developing pregnancy is considered acceptable under the prescribing information's criteria. It is a minimum rather than an arbitrary figure, and your oncologist may advise a longer gap depending on your disease status and treatment goals.
What happens if I become pregnant while on cetuximab?
Call your oncology team the same day — do not wait. The team will confirm the pregnancy, review your treatment, and arrange specialist input. Outcomes depend on when in the pregnancy the exposure occurred and how far into treatment you were. There is a cetuximab pregnancy exposure registry, and your team may ask for your consent to contribute to it — this helps build the evidence base for other patients in future. Early reporting gives you and your team the most options; delay narrows them.
I want children after my treatment is finished — what should I do now?
Tell your oncologist before treatment starts, not after. For women, egg or embryo freezing may be possible before cetuximab begins, and a referral to a reproductive specialist can usually be arranged at the same time as your oncology workup. For men, sperm banking is straightforward and should be discussed before any treatment begins. The two-month washout after cetuximab ends is a pharmacological minimum; your oncologist will advise on the right timing for attempting conception based on your disease and your response to treatment.
Is there any contraception method I should avoid on cetuximab?
The prescribing information requires effective contraception without naming a method to avoid. In practice, your oncologist or gynaecologist is the right person to advise you, since the best method depends on factors specific to you: other medications you are taking, your cancer type, and your general health. The main principle is to use a method with a consistently high effectiveness rate, rather than one that depends on perfect use every time. If you are unsure whether your current method qualifies, ask at your next appointment.
Can I use emergency contraception instead of ongoing contraception on cetuximab?
Emergency contraception is not a substitute for ongoing contraception during cetuximab treatment. It is designed for isolated unplanned incidents, not as a routine approach across a treatment period that may span many months. There is no known interaction between cetuximab and emergency contraception, but relying on it as your primary method creates a high risk of an unintended pregnancy during a period when that would be a serious medical situation. Use ongoing effective contraception, and tell your team if there is a reason you cannot.
My cancer is urgent — can the fertility conversation wait until after I start treatment?
Fertility preservation works best before treatment begins, not once it is underway. Most procedures — particularly egg or embryo freezing — take one to two weeks and can usually be arranged without meaningfully delaying cancer treatment. Your oncologist will give you an honest view of whether a short delay is safe for your situation. If treatment genuinely cannot wait, the conversation still matters, because some options remain available after starting and your team can tell you which ones apply to you. Do not skip it; raise it at the first appointment.