For many women considering becoming a surrogate, the medication process brings up plenty of questions. Why are medications 
necessary if your body already knows how to carry a pregnancy? Will you need injections? How long will the protocol last? What happens if your body does not respond exactly as expected?
Although every surrogacy journey and fertility clinic is different, learning the basics can make this part of the process feel much more familiar and manageable.
Why Surrogacy Medications Work Differently Than a Natural Pregnancy
In a natural pregnancy, ovulation triggers the body to produce hormones that prepare the uterine lining for implantation. After ovulation, the corpus luteum in the ovary produces progesterone to support the early pregnancy. Eventually, the placenta takes over hormone production.
A gestational surrogacy pregnancy begins differently. The embryo is created through in vitro fertilization and then transferred to the surrogate’s uterus. In a fully medicated transfer cycle, the surrogate may not ovulate. Without ovulation, the body may not produce the estrogen and progesterone needed at the right time, so medication is used to recreate and carefully control the hormonal conditions of a natural cycle.
Some surrogates participate in natural or modified natural transfer cycles. In those situations, the clinic monitors the surrogate’s own ovulation, and fewer medications may be necessary. The best approach depends on the surrogate’s health, menstrual cycle, medical history, and the clinic’s protocol.
Types of Medications Used in Surrogacy
Your medication plan will be customized for you, but it may include several of the following:
Birth Control Pills
Birth control pills may be used at the beginning of the process to regulate your cycle and coordinate your schedule with the planned embryo transfer. They give the fertility clinic more control over when the next phase begins.
Leuprolide or Similar Medications
Leuprolide may be used to temporarily suppress your natural cycle and prevent ovulation. This allows the clinic to manage the timing of estrogen, progesterone, and the embryo transfer more precisely. Not every surrogate will need this medication.
Estrogen
Estrogen helps build and thicken the uterine lining so it can support embryo implantation. It may be taken as a pill, applied through a patch, or given by injection.
Your clinic will monitor the lining through ultrasounds and may also check hormone levels with bloodwork.
Progesterone
Progesterone prepares the uterine lining to receive the embryo and supports the pregnancy after implantation. Timing is especially important because the clinic must coordinate the start of progesterone with the developmental stage of the embryo.
Progesterone may be given as an intramuscular injection, vaginal medication, or another form selected by the clinic.
Additional Medications and Supplements
Your clinic may prescribe prenatal vitamins, folic acid, low-dose aspirin, antibiotics, or other medications based on its protocol and your medical needs. These medications are not included in every surrogacy cycle. Do not begin taking a medication or supplement unless your fertility clinic has approved it.
Surrogacy Medication Timeline and Protocol
Your exact schedule may look different, but a medicated surrogacy cycle often follows these general stages:
Cycle Coordination
Birth control pills may be used for several days or weeks to regulate and synchronize your menstrual cycle. Your clinic will tell you exactly when to begin and stop them.
Cycle Suppression
If leuprolide or another suppression medication is included, it may begin before estrogen. The clinic may order bloodwork or an ultrasound to confirm that your body is ready to move forward.
Uterine Lining Preparation
Estrogen is often taken for approximately 10 to 14 days, although the length of time can vary. Ultrasounds help the clinic evaluate the thickness and appearance of the uterine lining.
Progesterone and Embryo Transfer
Once the lining is ready, progesterone begins. The number of progesterone doses needed before transfer depends on the age and developmental stage of the embryo. Because the timing must be precise, it is important to take every dose exactly as directed.
Pregnancy Testing and Continued Support
After the transfer, estrogen and progesterone usually continue until the pregnancy test. If pregnancy is confirmed, the clinic may continue these medications for several more weeks, sometimes through much of the first trimester. This hormonal support is typically continued until the placenta can provide sufficient hormones for the pregnancy.
Never stop a medication after a positive pregnancy test unless your clinic specifically instructs you to do so.
What Happens if Your Protocol Needs to Change?
Even with careful planning, medication protocols sometimes need to be adjusted. Your clinic may change a dose, extend the estrogen phase, adjust the transfer date, or prescribe a different form of medication.
Changes may be based on:
- Uterine lining measurements
- Estrogen or progesterone levels
- The timing of your menstrual cycle
- Your response to a medication
- Side effects or injection-site reactions
- The embryo transfer schedule
A protocol change does not automatically mean something is wrong. It often means your care team is using your test results to give your body the preparation it needs. In some cases, a transfer may be postponed so the clinic can create better conditions for implantation.
Support for Surrogates
It is important to care for yourself throughout the process. Stay hydrated, eat regular nourishing meals, get plenty of rest, and participate in gentle movement when your medical team approves it. If you experience side effects, tell your clinic rather than trying to manage them on your own.
Contact your care team promptly about any symptom that feels severe, unusual, or concerning. Chest pain, difficulty breathing, significant leg pain or swelling, sudden vision changes, a severe headache, or signs of an allergic reaction require immediate medical attention.
If you are interested in becoming a surrogate mother, Shared Conception is here to answer your questions, help you understand what to expect, and support you throughout your journey. Please visit: https://sharedconception.com/deliver-a-dream to fill out our short inquiry form.
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