The goserelin implant: a monthly injection under the skin

Goserelin, known by the brand name Zoladex, does not come as a tablet or an ordinary injection. It comes as a tiny solid implant, roughly the size of a grain of rice, already loaded inside a single-use syringe with a wider needle than you may be used to. A nurse or doctor places the implant just under the skin of the lower belly, usually to one side of the navel. For breast cancer it is normally given once every four weeks. The whole visit, from sitting down to walking out, often takes just a few minutes. Most people describe a sharp pinch and a feeling of pressure, and many find it less uncomfortable than they feared. A numbing cream or a small injection of local anaesthetic can be used first if you are worried about the needle. Afterwards, a small bruise or a tender spot is common and usually fades within days. Over the next four weeks the implant slowly releases goserelin and gradually dissolves, so nothing needs to be removed. You can usually go straight back to work, drive and carry on with your normal day. The main thing to plan for is keeping each appointment on time, because the effect wears off if an implant is late.

It is placed, not injected as liquid

The needle carries a small solid rod under the skin, which is why it is a little wider than usual.

It is quick

The implant itself takes seconds. Most of the visit is checking details and settling you comfortably.

Timing matters most

Booking your next date before you leave is the simplest way to avoid gaps in treatment.

For most people, the implant is a brief and manageable part of the month. It is still fair to be clear about the parts people find harder.

The needle is wider than usual

Because it carries a solid implant, the needle is bigger than one used for a vaccine. Some people feel it more, especially if they have little fat on the belly.

Serious bleeding is rare but real

Regulators have warned about injury to blood vessels in the belly wall, occasionally causing heavy bleeding. It is more likely in people who are very slim or who take blood thinners, so tell your nurse about these.

It is a monthly commitment

Implants continue for months or years, which means regular travel and time off work for many people.

What this page cannot tell you

It cannot tell you how the implant will feel for you, or whether a different way of switching off the ovaries would suit you better. Your nurse and oncologist can discuss comfort measures and alternatives.

Goserelin only keeps the ovaries switched off while fresh implants keep arriving on time. Planning ahead stops small delays from adding up.

Book in blocks

Some clinics let you book several appointments in advance. Set a phone reminder a few days before each date.

Travel and festivals

If you will be away, ask your team whether the implant can be given a few days early, or arranged with a trained nurse or doctor near where you will be. Keep a written note of the medicine and your dates.

Having it closer to home

With your oncologist's agreement, some people have implants from a local doctor or nurse. Make sure the date of each one is shared with your main team so your record stays accurate.