Makena (Generic Hydroxyprogesterone): Complete Medication Guide
Key Takeaways
Hydroxyprogesterone is a synthetic hormone used to reduce the risk of preterm birth in pregnant people with a history of early delivery.
It's given as a weekly injection starting around week 16 of pregnancy and continuing until week 36.
Common side effects include injection site reactions, mood changes, and headaches.
This medication may increase the risk of gestational diabetes and requires regular monitoring.
Always discuss the benefits and risks with your healthcare provider before starting treatment.
Hydroxyprogesterone Overview
Hydroxyprogesterone caproate (Makena) is a synthetic form of progesterone, a hormone that plays a critical role in pregnancy. This medication belongs to a class of drugs called progestins. Hydroxyprogesterone works by strengthening the uterus and reducing contractions that might lead to early labor, helping extend pregnancy to a safer gestational age.
The drug is specifically designed for pregnant people who have experienced a spontaneous preterm birth (delivery before 37 weeks) in a prior pregnancy. By maintaining higher progesterone levels throughout the second and third trimesters, hydroxyprogesterone may reduce the chance of delivering prematurely again. This medication has been shown in clinical studies to lower preterm birth rates by approximately 35% in eligible candidates.
Hydroxyprogesterone is available as a generic medication, which may offer cost savings compared to brand-name alternatives. Understanding generic vs brand name drugs can help you make informed decisions about your pregnancy care and medication costs.
Side Effects
Hydroxyprogesterone is generally well-tolerated, though like all medications, it may cause side effects in some people. Most side effects are mild to moderate and tend to improve with continued use.
Common Side Effects
Injection site reactions — Redness, swelling, itching, or pain at the spot where you receive the weekly injection; usually mild and temporary.
Mood changes — Feelings of depression, anxiety, or mood swings; may occur during the first few weeks of treatment.
Headaches — Mild to moderate headaches that may ease over time as your body adjusts to the medication.
Nausea — Mild stomach upset or queasiness, particularly in the morning or after meals.
Fatigue — Increased tiredness or low energy levels during the day.
Bloating or weight gain — Mild fluid retention or slight weight gain due to hormonal changes.
Serious Side Effects
Allergic reactions — Rare but serious reactions including hives, swelling of the face or throat, or difficulty breathing; requires immediate medical attention.
Blood clots — Increased risk of deep vein thrombosis (DVT) or pulmonary embolism, especially in those with clotting disorder risk factors.
Severe mood disturbances — Depression, suicidal thoughts, or severe anxiety warranting urgent evaluation by your healthcare provider.
Gestational diabetes — Elevated blood sugar levels during pregnancy; requires monitoring and possible dietary or insulin management.
Liver problems — Jaundice, abdominal pain, or other signs of liver dysfunction in rare cases.
When to Seek Medical Attention
Contact your healthcare provider immediately if you experience chest pain, severe shortness of breath, sudden vision changes, or signs of a blood clot (leg swelling, warmth, or redness). If you notice severe mood changes, thoughts of harming yourself, or allergic symptoms like facial swelling or difficulty breathing, seek emergency care right away. Routine side effects like mild injection site irritation or headaches can usually be managed with your doctor's guidance, but any new or worsening symptoms should be discussed during your regular prenatal visits.
Dosage
Dose Level or Form |
Dose |
Key Detail |
Standard intramuscular injection |
250 mg per week |
Begins around week 16–20 of pregnancy |
Injection frequency |
Once weekly |
Same day each week for consistency |
Duration |
Week 16–36 of pregnancy |
Continues until 36 weeks or delivery, whichever comes first |
Route |
Intramuscular (IM) |
Administered into muscle, typically the buttock or hip |
Preparation |
Stored at room temperature |
Check expiration date before each injection |
Drug Interactions
Hydroxyprogesterone may interact with certain medications and substances. Always inform your healthcare provider about all medications, supplements, and herbal products you're taking, as some may affect how well hydroxyprogesterone works or increase side effect risk.
Corticosteroids
Concurrent use of corticosteroids (like prednisone) with hydroxyprogesterone may increase the risk of fluid retention and gestational diabetes. Your doctor may need to monitor blood sugar levels more closely and adjust doses if necessary.
Anticonvulsants
Medications like phenytoin or carbamazepine may reduce hydroxyprogesterone's effectiveness by speeding its breakdown in the body. Your healthcare provider may recommend higher doses or closer monitoring of pregnancy outcomes.
Ketoconazole and Other Antifungals
These medications may increase hydroxyprogesterone levels in the blood, potentially raising the risk of side effects. Your doctor may adjust dosing or monitor you more frequently if you need antifungal treatment.
CYP3A4 Inhibitors
Drugs that inhibit the CYP3A4 enzyme (such as ritonavir or erythromycin) may slow hydroxyprogesterone metabolism and increase blood levels. Discuss with your provider if you're taking these medications during your pregnancy.
NSAIDs
Nonsteroidal anti-inflammatory drugs (NSAIDs) may interact with hydroxyprogesterone and increase the risk of cardiovascular or renal side effects. Acetaminophen is typically preferred for pain relief during pregnancy.
Estrogen-Based Medications
Other hormonal medications or estrogen-containing products may potentiate hormone effects or alter how hydroxyprogesterone works. Inform your provider of all hormonal therapies before starting injections.
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Pros and Cons
Pros
Proven efficacy — Clinical trials show approximately 35% reduction in preterm birth risk for eligible candidates with prior preterm delivery.
Once-weekly dosing — Simple injection schedule makes it easy to remember and incorporate into prenatal care.
Generic availability — Cost-effective alternative to brand-name drugs may help reduce out-of-pocket expenses.
Well-tolerated — Most side effects are mild and manageable, improving over time with continued use.
Targeted treatment — Specifically designed for high-risk pregnancies, addressing the underlying cause of preterm birth.
Cons
Weekly injections — Requires a weekly office visit or home injection, which some people find inconvenient.
Injection site reactions — Pain, swelling, or redness at injection sites is common and may worsen with repeated injections.
Limited benefit window — Only effective for people with a documented history of prior preterm birth; not beneficial for all pregnancies.
Gestational diabetes risk — May increase blood sugar problems during pregnancy, requiring additional monitoring and management.
Mood side effects — Some people experience depression or anxiety, which may be concerning during pregnancy.
Frequently Asked Questions
Hydroxyprogesterone is recommended for pregnant people with a documented history of spontaneous preterm birth in a prior pregnancy. Your healthcare provider will assess your pregnancy history, risk factors, and current pregnancy to determine if this medication is appropriate for you. It is not recommended as a preventive measure for all pregnancies.
Treatment typically begins between weeks 16 and 20 of pregnancy and continues until week 36 or delivery, whichever comes first. Starting the medication in the second trimester allows your body to build protective progesterone levels before the higher-risk third trimester. Your doctor will establish the exact start date based on your individual circumstances.
There are no specific dietary restrictions related to hydroxyprogesterone. You may continue eating normally and staying active during pregnancy as recommended by your healthcare provider. However, regular prenatal care, screening for gestational diabetes, and following general pregnancy health guidelines are important for the best outcomes.
Hydroxyprogesterone is not typically recommended for multiple pregnancies (twins, triplets, etc.) because research has not established clear benefit in that setting. If you are pregnant with multiples and have a history of preterm birth, discuss alternative prevention strategies with your healthcare provider.
After completing hydroxyprogesterone at week 36, your healthcare team will continue routine prenatal monitoring and prepare for labor and delivery. At this gestational age, the risk of serious complications from prematurity decreases significantly. Your doctor will discuss labor induction or monitoring plans based on your individual pregnancy status.
The Bottom Line
Hydroxyprogesterone is a targeted hormone therapy designed to reduce preterm birth risk in pregnant people with a prior history of early delivery. When used as prescribed, it may significantly lower your chances of experiencing another preterm birth, allowing your pregnancy to progress safely into the third trimester. While side effects like injection site reactions and mood changes are possible, they are usually manageable and improve over time. The decision to use hydroxyprogesterone should be made collaboratively with your healthcare provider, weighing the benefits against your individual risk profile and any underlying health conditions. If you're pregnant and uncertain whether this medication is right for you, Doctronic offers 24/7 access to healthcare professionals who can discuss your options. With 99.2% treatment alignment with physicians and 22M+ consultations, you can get personalized guidance quickly—whether through a free AI consultation or a video visit with a licensed clinician. Your pregnancy deserves expert care tailored to your unique needs.
