How Many Injections for IVF Treatment?

How Many Injections for IVF Treatment?


In vitro fertilization (IVF) is a complicated assisted reproductive technology (ART) process that involves a variety of medications, many of which are administered through injections. These medications play crucial roles in stimulating the ovaries to produce multiple eggs, which significantly enhances the chances of successful fertilization.

Prospective patients must understand the quantity and kinds of injections required in IVF. To increase egg production, gonadotropin injections are usually administered daily for 8–14 days. In addition, drugs like GnRH agonists or antagonists are utilized to delay ovulation, and an hCG injection is given to initiate the eggs’ ultimate maturation.

Progesterone injections may be necessary following egg retrieval in order to facilitate early pregnancy and prepare the uterine lining for embryo implantation. Patients can better control their expectations, be ready for their therapy, and follow the recommended protocol if they are knowledgeable about these injections. Depending on the needs of patients, between 22 to 113 injections are made during the IVF treatment. So, let’s dive deeper into the specific roles of these injections during the IVF process and, more importantly, how many injections patients receive during the IVF treatment:


The Role of Injections in IVF

First, let’s understand why IVF involves so many injections and what their role is. Basically, the goal of the ovarian stimulation phase of IVF is to generate many eggs in a single cycle. Gonadotropins, such as luteinizing hormone (LH) and follicle-stimulating hormone (FSH), are usually injected daily throughout this phase. These hormones have the effect of causing the ovaries to create many follicles, each of which has the potential to hold an egg. The intention is to maximize the quantity of mature eggs that are accessible for retrieval in order to improve the likelihood of fertilization and successful embryo development.

Injections of GnRH agonists or antagonists may be administered to patients in addition to gonadotropins. These drugs work by regulating the body’s release of hormones, which delays premature ovulation. This ensures that the eggs won’t hatch before they can be collected. For instance, drugs like the GnRH agonists Lupron and Cetrotide are frequently used to preserve the cycle’s timing and regulation.

It is important to note when the eggs finally mature as the follicles grow. The “trigger shot,” or hCG injection, is used to force the eggs to reach their ultimate stage of maturity. To make sure the eggs are ready for collection, this injection is scheduled exactly 36 hours before the egg retrieval process.

Each injection throughout the IVF treatment acts to enhance the bodily functions in the patient to make it more suitable for various stages of fertility.


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Number and Types of IVF Injections

As discussed above, a patient’s specific procedures and reaction to the drugs may determine the quantity and kind of injections they need. The ovarian stimulation phase, which involves daily gonadotropin injections, typically lasts 8 to 14 days. Furthermore, individuals can require daily injections of GnRH agonists or antagonists beginning on the fifth or sixth day of stimulation and continuing until the trigger shot is given.

Progesterone injections are frequently needed after retrieval to maintain the uterine lining and aid in embryo implantation. These injections are given every day from the day of the egg retrieval until the pregnancy test. They might go on for a few weeks if the pregnancy is verified, only to make sure the uterine lining keeps assisting the growing embryo. These Injections can be between 22 and 113 based on a patient’s need.


Types of Injections in IVF

Now that the role and overall number of IVF injections are known to us. Let’s find out what exactly these injections are and what these hormones do. There are three types of IVF injections in total: Ovarian Stimulation Medications, GnRH Agonists/Antagonists, and Progesterone. But what does each injection entail?


1. Ovarian Stimulation Medications

In the initial stage of in vitro fertilization, the ovaries are stimulated to generate numerous eggs. To improve the likelihood of successful fertilization and implantation, the objective is to increase the number of available eggs. During this stage, the following drugs are frequently used:

  • Gonadotropins: These comprise analogs of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Medications like Menopur, Follistim, and Gonal-F are usually taken every day. The time and dosage are contingent upon the patient’s reaction to the medicine; nonetheless, these injections are often administered for 8-14 days.
  • Chorionic gonadotropin (hCG) in humans: Once the follicles are the proper size, this injection initiates the last stage of egg development. Given that it gets the eggs ready for retrieval, this injection is essential. This injection is timed precisely, typically taking place 36 hours before the planned egg retrieval.


2. GnRH Agonists/Antagonists

GnRH Agonists/Antagonists are used to prevent premature ovulation during the ovarian stimulation phase:

  • GnRH Agonists: Premature ovulation can be avoided, and the release of endogenous hormones can be controlled using GnRH antagonists like Lupron. Before beginning gonadotropins, they are usually given every day for 10–14 days or until the hCG triggers.
  • GnRH Antagonists: These include Cetrotide and Ganirelix, which are taken daily beginning on the fifth or sixth day of stimulation and continuing until the hCG trigger. By inhibiting the luteinizing hormone spike, these drugs prevent ovulation before egg retrieval.


3. Progesterone

Following egg retrieval, progesterone is used to sustain early pregnancy and ready the endometrium, or lining of the uterus, for embryo transfer. It can be given via vaginal suppositories or intramuscular injections. Usually, this drug is used every day for a few weeks, particularly if the pregnancy is successful.


For more information, read:

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IVF Injections: How Many Days?

The exact number of days and injections varies based on the individual’s response to medications and specific treatment protocols. Here is a typical breakdown:


Ovarian Stimulation Phase

This phase typically lasts between eight and fourteen days with daily gonadotropin injections. During this time, individuals may need an average of 8–14 shots. Frequent monitoring with ultrasounds and blood tests aids in dosage adjustments to maximize egg production and reduce adverse effects.


Gnrh Agonists/Antagonists

  • GnRH Agonists: These can be used every day for ten to fourteen days prior to beginning stimulation and then for the duration of the stimulation phase, for a total of eighteen to twenty-eight injections.
  • GnRH Antagonists: Depending on the protocol being utilized, they are often given three to seven injections each day beginning on the fifth or sixth day of stimulation.


hCG Trigger

hCG is a single injection administered once during the cycle to trigger final egg maturation. Its timing is critical and is usually scheduled 36 hours before the egg retrieval procedure​. Exogenous hCG has been utilized to induce the latter stages of oocyte maturation since the mid-1970s, owing to the biological activity of human chorionic gonadotropin (hCG) being comparable to that of LH.



If given by injection, progesterone usually begins the day following egg retrieval and lasts for ten to twelve days or until the pregnancy test. If pregnancy is confirmed, progesterone injections can last up to 10 weeks, which means that shots will need to be taken every day for a few weeks. This might build up to about 70 injections if it is done for the entire term.


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How to Take IVF Injections at Home?


Preparing for the IVF Injection Process

Similar to most injections, reducing anxiety and ensuring commitment to the treatment procedure can be achieved by being aware of the purpose and schedule of these injections. Whether these injections are given in the thigh or stomach, patients need to be well-trained in their administration techniques to reduce pain and guarantee that the medication is absorbed. Frequent monitoring with ultrasounds and blood tests helps optimize results and lower the risk of side effects, including ovarian hyperstimulation syndrome (OHSS), by adjusting drug dosages as needed.

The injection procedure is a crucial part of the IVF treatment that needs to be carefully managed and followed exactly as directed. By being aware of the functions and timing of these injections, patients can increase their chances of a favorable outcome and better prepare for their treatment journey.


Total IVF Injections

The total number of injections required for an IVF cycle can vary depending on the individual’s treatment protocol and response to the medications. The total number of injections varies but typically includes:


  • Gonadotropins: 8-14 injections
  • GnRH Agonists/Antagonists: 3-28 injections, depending on the protocol
  • hCG Trigger: 1 injection
  • Progesterone: 10-70 injections depending on pregnancy outcome
  • Typically, patients can expect to administer between 8 and 14 injections of gonadotropins, which are essential for stimulating the ovaries to produce multiple eggs. This phase usually lasts about 8 to 14 days, with daily injections being a common requirement.

To prevent early ovulation, patients may require the use of Gnrh agonists or antagonists in addition to gonadotropins. Depending on the particular protocol and the patient’s reaction, the number of these injections may vary from 3 to 28. Daily injections of GnRH antagonists may be necessary for certain regimens, beginning with the fifth or sixth day of ovarian stimulation and lasting until the hCG trigger shot. About 36 hours prior to the planned egg retrieval, a single injection known as the hCG trigger shot is given. This injection is essential for the final stages of egg maturation.


For more information, read:

The Advantages and Disadvantages of IVF


Progesterone injections are frequently necessary after egg retrieval to maintain the uterine lining and increase the likelihood of successful embryo implantation. Depending on whether the pregnancy is obtained and maintained, the number of progesterone injections might vary greatly, ranging from 10 to 70. These injections may be given for several weeks during the early stages of pregnancy.


An IVF cycle may need patients to get between 22 and 113 injections overall, underscoring the significant time commitment and preparation required for this procedure. This wide range highlights how customized IVF is for each patient, as their regimen is based on their unique medical requirements and reactions to treatment.


Final Words

IVF involves a significant number of injections, which are critical for the success of the treatment. Each injection serves a specific purpose, from stimulating the ovaries to preparing the uterus for embryo implantation. Understanding the process and the role of each medication can help patients manage expectations and prepare for the physical demands of IVF.

If you are looking to start your fertility journey towards parenthood, contact us at CarefulTrip so we can link you to amazing fertility clinics like MOM Fertility Clinic in Tehran. Have a free consultation with our excellent fertility specialists to tailor the treatment protocol to your specific needs, ensuring the best possible outcomes.


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IVF Injection Side Effects

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