Fertility Medication Explained: What They Are and Why They’re Used

Starting fertility treatment can feel like stepping into a whole new world with confusing words, new routines, and, often, a variety of medications. It’s completely normal to feel a little bit overwhelmed at first. Understanding what each medication does and why it’s used can help you feel more in control and confident throughout your journey. 

Why Fertility Medication is Used 

Fertility medications are prescribed to support your body at different stages of the reproductive process. They can help with egg and follicle growth, control ovulation, and prepare the womb lining for an embryo to implant. 

The exact combination of medications you're given will depend on your treatment type; whether that's ovulation induction, intrauterine insemination (IUI), or in vitro fertilisation (IVF). Every protocol is personalised to give you the best chance of success.

1. Stimulating the Ovaries 

In a natural cycle, your body usually grows and releases one egg per month. During fertility treatment, medication helps your ovaries grow several eggs to increase your chances of pregnancy. ‍

‍You might be prescribed: 

Clomifene (Clomid) or Letrozole – tablets that gently stimulate the ovaries, often used in early treatment such as ovulation induction or IUI cycles. 

Gonadotrophins (e.g. Gonal-F, Meniofert, Menopur, Bemfola) – injectable medications that contain FSH (and sometimes LH) to help to stimulate multiple eggs to mature. 

Your fertility team will monitor your progress closely with scans and blood tests to make sure your response is safe and effective. 

2. Triggering Ovulation or Egg Maturity 

Once your eggs are ready, you’ll take a “trigger shot” usually hCG or a GnRH agonist like Buserelin, to help the eggs mature and prepare for ovulation or egg collection. Timing is key here, and your clinic will guide you through exactly when to take it. 

3. Preventing Premature Ovulation 

In IVF, it's important that your eggs don't release too early. To prevent this, you may take GnRH antagonists such as Cetrotide or Fyrmadel. These are short daily injections that keep ovulation under control until the right moment for egg collection. You are usually prescribed these as part of a short or antagonist protocol.

4. Supporting Implantation 

After egg collection or ovulation, you’ll usually start progesterone through pessaries, vaginal gel, or injections to help prepare the womb lining for implantation and support early pregnancy. 

Sometimes, your doctor may also prescribe oestrogen patches or tablets to help the lining grow, or additional medications like low-dose aspirin, steroids, or blood thinners, depending on your individual needs. 

Every medication you’re prescribed plays a specific role in helping your body prepare treatment and a potential pregnancy. It’s completely normal to have questions or worries about how to take them or what to expect. Your fertility nurse is always there to support you. 

Remember: you're not doing this alone. Each dose, each injection, each step brings you closer to your goal. Take it one day at a time and know that The IVFN community is right beside you.

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