SURROGACY MEDICATIONS GUIDE: PROTOCOLS, SIDE EFFECTS, AND SELF-CARE

The medication phase is one of the more unfamiliar parts of becoming a surrogate. Most surrogate applicants know injections are part of the process, but the full scope of medications, timing, and coordination often comes as a surprise. Your fertility clinic creates a medication plan to prepare your body for an embryo transfer and support the earliest stage of pregnancy. Your IVF physician and nursing team provide instruction at each step, and your Growing Generations point of contact helps coordinate the process alongside them. 

This guide explains why surrogacy medications are needed, how they work together, what side effects you may notice, and how you can care for yourself during the process. Surrogacy medications are hormones — primarily estrogen and progesterone — that prepare the uterine lining for embryo transfer and support the earliest weeks of pregnancy until the placenta takes over. Your exact medications and doses depend on your clinic's protocol.

Why Surrogacy Medications Work Differently Than a Natural Pregnancy

In a naturally conceived pregnancy, ovulation, fertilization, and early hormone production happen within the body’s menstrual cycle. Your ovaries and the structure that develops after ovulation, known as the corpus luteum, produce hormones that help prepare and support the uterine lining.

A gestational surrogacy pregnancy begins differently. You carry an embryo created through in vitro fertilization, or IVF, using an egg and sperm from the intended parents or donors. Because conception takes place outside your body, the fertility clinic must carefully coordinate your uterine lining with the embryo’s stage of development.

Medications help the clinic control that timing. Estrogen may prepare and thicken the uterine lining, while progesterone helps create the conditions needed for implantation and early pregnancy support. In an embryo transfer cycle, these hormones can also bridge the early weeks of pregnancy until the placenta produces enough hormones to support the pregnancy.

Your exact plan will depend on the fertility clinic, the type of embryo transfer, your menstrual cycle, and how your body responds. Some surrogates follow a fully medicated transfer protocol, while others may use a natural or modified natural cycle.

For that reason, you should follow the calendar provided by your IVF clinic rather than a general medication timeline.

Types of Medications Used in Surrogacy

Your protocol may include several medication categories. Each one has a specific role in preparing your body for embryo transfer or supporting early pregnancy.

Cycle Control Medications

The clinic may prescribe birth control pills early in the process to regulate your cycle and coordinate the timing of treatment. Hormonal contraceptives can help fertility clinics schedule assisted reproductive treatment and manage the start of a cycle. Some protocols also use leuprolide, often known by the brand name Lupron, to temporarily suppress ovulation and give the clinic greater control over cycle timing. Fresh and frozen embryo transfer protocols may differ.

Estrogen

Estrogen helps build and maintain the uterine lining before embryo transfer. The clinic will monitor the lining to determine whether it has developed appropriately for the planned transfer. Depending on your protocol, you may take estrogen as oral pills, skin patches, injections, or vaginal medication. The clinic may also change the dose or delivery method if monitoring shows that your lining needs more time or support.

Progesterone

Progesterone helps make the uterine lining receptive to an embryo and supports the lining after transfer. The timing of the first dose matters because the clinic coordinates your progesterone exposure with the embryo's developmental stage. Your clinic may prescribe progesterone through intramuscular injections, vaginal suppositories, or another approved form. Many surrogacy protocols use progesterone in oil injections, but the IVF physician will determine which method fits your medical plan.

Transfer Support Medications

Some clinics prescribe additional medications around the transfer window. These may include low-dose aspirin, antibiotics, or corticosteroids. Each medication serves different purposes. An antibiotic may help reduce the risk of infection, while other medications may support blood flow or create conditions the physician considers favorable for transfer. However, these medications are not part of every protocol. Do not begin aspirin or any other transfer support medication unless your IVF physician instructs you to take it.

Prenatal Vitamins and Supplements

You may begin a prenatal vitamin before the medication cycle and continue it throughout pregnancy. Prenatal vitamins provide nutrients that support your health and fetal development, including folic acid and iron. The American College of Obstetricians and Gynecologists recommends a prenatal vitamin containing at least 400 micrograms of folic acid before pregnancy for most people. Your care team may recommend a different amount based on your health history.

Tell your IVF team about every vitamin, supplement, herbal product, prescription medication, and over-the-counter medication you use. “Natural” products can still interact with medications or create concerns during pregnancy, so you should receive approval before taking anything new.

Purpose and Function of Each Medication in the Surrogacy Cycle

It may help to view your medications as a coordinated sequence rather than a collection of unrelated prescriptions.

Cycle control medications help the clinic determine when the transfer cycle begins and when the uterus will be ready. Estrogen then supports the development of the uterine lining. Once the lining reaches the clinic’s target, progesterone helps prepare it for implantation and supports the early pregnancy environment.

Short-term transfer medications may address a specific need identified by the physician, such as infection prevention or blood-flow support. Prenatal vitamins provide important nutrients, but they cannot take the place of fertility medications prescribed to prepare and support the uterine lining.

The timing of each step is important. Taking the right medication at the right time allows the clinic to align your uterus with the age of the embryo. This is why you should contact the clinic before making any changes, even when the change seems minor.

Surrogacy Medication Timeline and Protocol

No single medication schedule applies to every surrogate. Your clinic will provide you with a personalized calendar listing medication names, doses, times, monitoring appointments, and transfer instructions. The following overview can help you understand the general phases of the process.

Before the Medication Cycle

Before finalizing your calendar, the clinic reviews your medical screening results, bloodwork, menstrual history, and anticipated embryo transfer timing. The medical team may also perform an ultrasound or other testing to establish a baseline.

Many clinics now recommend or require a mock cycle for surrogates who are new to IVF. During a mock cycle, the care team observes how your uterine lining responds to medication before moving forward with the actual transfer cycle. You can  also begin taking prenatal vitamins before fertility medications start.

Cycle Preparation

Your calendar may begin with birth control pills, Lupron, or another suppression medication. These medications can help prevent unexpected ovulation and allow the clinic to control the cycle more precisely. You may attend monitoring appointments for bloodwork and ultrasounds. These appointments help the team evaluate your hormone levels, ovaries, and uterine lining.

Medication changes during this phase are common. A revised dose or an extra monitoring appointment does not automatically mean something has gone wrong. Your body may simply need a different amount of medication or more time to reach the clinic’s goal.

Lining Development

The clinic may prescribe estrogen to help build your uterine lining. You will continue monitoring appointments so the team can measure the lining and evaluate your hormone levels.

Based on those results, the clinic may adjust your estrogen dose, change how you take it, or extend the lining-development phase. These adjustments allow the team to respond to your body rather than force every surrogate into the same schedule.

Embryo Transfer Window

Progesterone often begins several days before the embryo transfer. The clinic carefully times the start of progesterone because the number of hours or days of exposure must align with the embryo’s developmental stage.

You may also take short-term support medications if they are included in your protocol. Once the clinic confirms that your hormone levels, lining, and timing are appropriate, you will move forward with the embryo transfer.

After Embryo Transfer

You may continue estrogen and progesterone while you wait for your pregnancy blood test. It is important to keep taking every medication exactly as directed, even if you notice spotting, cramping, pregnancy symptoms, or no symptoms at all. If the pregnancy test confirms implantation, your clinic may continue hormone support during the early weeks of pregnancy. The placenta gradually takes over hormone production as the pregnancy develops.

Your clinic will use bloodwork, ultrasounds, and pregnancy progress to decide when you can taper or stop medication. Never stop estrogen or progesterone on your own, even after a positive pregnancy test.

Common Side Effects of Surrogacy Medications

Many surrogates experience only mild or manageable side effects. Your experience will depend on the medications you take, their doses, and how your body responds. Estrogen and progesterone may cause:

• Bloating

• Breast tenderness

• Nausea

• Headaches

• Fatigue

• Mood changes

• Mild cramping

• Vaginal discharge when using vaginal medication

Progesterone injections may also cause soreness, bruising, itching, or small firm areas near the injection site. Some people notice temporary lumps where the oil settles in the muscle.

Lupron may cause hot flashes, headaches, fatigue, injection-site discomfort, or mood changes. Birth control pills may cause nausea, breast tenderness, headaches, spotting, or emotional shifts during the short course.

You should tell your clinic when side effects feel difficult to manage or interfere with daily life. The team may recommend safe comfort measures or determine whether your medication needs to change. Seek prompt medical guidance for severe or unusual symptoms, including signs of an allergic reaction, trouble breathing, chest pain, fainting, severe abdominal pain, heavy bleeding, significant swelling, vision changes, or a severe headache that does not improve. Contact the IVF clinic or emergency medical services based on the urgency of the symptoms and the instructions your care team has provided.

What Happens If Your Protocol Needs to Change

A medication calendar can change after your cycle begins. Fertility care depends on careful monitoring, and your body may respond differently than the clinic first anticipated.

Ultrasounds and bloodwork may show that your lining needs more time, your hormone levels require additional support, or your ovulation timing has shifted. The clinic may increase or decrease estrogen, change your progesterone start date, adjust a suppression medication, or schedule another monitoring appointment.

A delayed transfer does not always mean the cycle has been canceled. The clinic may move the transfer date to give your body more time to reach the right conditions. In other situations, the physician may recommend stopping and restarting the cycle to protect your health or improve the transfer environment.

Changes can feel disappointing or stressful, especially when you have followed every instruction. They do not mean you did something wrong.

You can ask your nurse or coordinator:

• What changed in my monitoring results?

• Why is my medication plan changing?

• Does this affect the transfer date?

• What should I do with my current medications?

• When is my next appointment or update?

Make sure you receive an updated written calendar when instructions change.

Preparation and Support for Surrogates

A little preparation makes the medication phase easier to manage. Focus on organization, communication, and simple forms of self-care.

Managing the Medication Schedule

Set daily alarms for each medication, especially when the clinic requires you to take a dose at a specific time. Keep your written or digital calendar somewhere you can check it easily.

Review the calendar at the beginning of each day, and confirm that you have enough medication and supplies for the days ahead. Contact your coordinator or pharmacy before you are close to running out. When your protocol includes injections, the clinic should teach you how to prepare and administer them. A partner or trusted support person may also learn how to help if the clinic permits it.

Contact the IVF clinic immediately if you miss a dose, take the wrong amount, use the wrong medication, vomit after an oral dose, or take a medication later than instructed. Do not double the next dose unless the clinic tells you to do so.

Physical Self-Care

Hydration, regular meals, and adequate rest may help you manage fatigue, headaches, nausea, or other hormone-related discomfort. Gentle movement may also help with stiffness and mood, unless your clinic gives you activity restrictions.

For progesterone injections, the clinic may suggest rotating injection sites, applying a warm compress, or gently moving the muscle afterward. Ask the nursing team to review your injection technique if you experience significant pain, redness, swelling, or persistent lumps.

Discuss alcohol use, new supplements, and over-the-counter medications with the clinic before using them. Even familiar medications may not fit your current protocol or pregnancy stage.

Emotional and Process Support

Medication schedules can feel demanding, especially when they involve frequent appointments, injections, or last-minute changes. Knowing who to contact for each question can reduce stress. Your IVF clinic manages medical instructions, side effects, monitoring results, dosage changes, and missed dose guidance. Growing Generations helps you understand the process, coordinate logistics, communicate across the journey, and connect with emotional support resources when needed. Your clinic, the Growing Generations team, and personal support system all play a role in helping you move through this phase.

FAQs

Do surrogacy medications involve injections?

Many medication protocols involve injections, especially progesterone in oil. Some clinics also prescribe injectable estrogen or suppression medication. However, not every surrogate uses the same medication forms. Your clinic may prescribe pills, patches, vaginal medications, or a combination of methods based on the transfer plan. 

What happens if I miss a dose?

Contact your IVF clinic as soon as you realize that you missed or incorrectly took a dose. Tell the team which medication you missed, the prescribed dose, and the time you should have taken it. Do not double a dose or change the rest of your schedule unless the clinic gives you direct instructions. 

When do surrogacy medications stop after a successful transfer?

Estrogen and progesterone may continue through the early weeks of pregnancy while the placenta develops its ability to produce the hormones needed to support the pregnancy.

The exact stopping point varies by protocol and pregnancy progress. Your clinic will use bloodwork, ultrasound findings, and other medical information to decide when to taper or stop each medication. 

Are side effects from surrogacy medications normal?

Mild side effects such as bloating, breast tenderness, fatigue, headaches, nausea, mood changes, and injection-site soreness can occur during a medicated transfer cycle. Severe, sudden, worsening, or unusual symptoms require clinical guidance. Contact your IVF team when you are concerned, even if you are unsure whether a symptom is medication-related. 

Surrogacy medications prepare your body for embryo transfer and support the earliest stage of pregnancy. Although the protocol can seem complicated at first, each medication and monitoring appointment serves a purpose.

Your responsibility is to follow the clinic’s calendar, ask questions when instructions are unclear, report side effects or missed doses, and care for yourself throughout the process.

At Growing Generations, we work alongside you, the intended parents, and the fertility clinic to help connect you with the right people at each step. Learn more about becoming a surrogate with Growing Generations.

Sources:

American College of Obstetricians and Gynecologists. “Good Health Before Pregnancy: Prepregnancy Care.” ACOG. 

American Society for Reproductive Medicine. “Hormonal Induction of Endometrial Receptivity for Fresh or Frozen Embryo Transfer.” ASRM. 

American Society for Reproductive Medicine. “Recommendations for Practices Using Gestational Carriers: A Committee Opinion.” ASRM, 2022. 

National Library of Medicine. “Leuprolide Injection.” MedlinePlus.