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CLINICAL PHARMACOLOGY Mechanism Of Action Hydroxyprogesterone caproate is a synthetic progestin. The mechanism by which hydroxyprogesterone caproate reduces the risk of recurrent preterm birth is not known. Pharmacodynamics No specific pharmacodynamic studies were conducted with Makena. Pharmacokinetics Absorption Female patients with a singleton pregnancy received intramuscular doses of 250 mg hydroxyprogesterone caproate for the reduction of preterm birth starting between 16 weeks 0 days and 20 weeks 6 days. All patients had blood drawn daily for 7 days to evaluate pharmacokinetics. Table 4 : Summary of Mean (Standard Deviation) PK Parameters for Hydroxyprogesterone Caproate Group (N) Cmax (ng/mL) Tmax (days)a AUC(1-t)b (ng•hr/mL) Group 1 (N=6) 5.0 (1.5) 5.5 (2.0-7.0) 571.4 (195.2) Group 2 (N=8) 12.5 (3.9) 1.0 (0.9-1.9) 1269.6 (285.0) Group 3 (N=11) 12.3 (4.9) 2.0 (1.0-3.0) 1268.0 (511.6) Blood was drawn daily for 7 days (1) starting 24 hours after the first dose between Weeks 1620 (Group 1), (2) after a dose between Weeks 24-28 (Group 2), or (3) after a dose between Weeks 32-36 (Group 3) a Reported as median (range) b t = 7 days For all three groups, peak concentration (Cmax) and area under the curve (AUC(1-7 days)) of the mono-hydroxylated metabolites were approximately 3-8fold lower than the respective parameters for the parent drug, hydroxyprogesterone caproate. While di-hydroxylated and tri-hydroxylated metabolites were also detected in human plasma to a lesser extent, no meaningful quantitative results could be derived due to the absence of reference standards for these multiple hydroxylated metabolites. The relative activity and significance of these metabolites are not known. The elimination half-life of hydroxyprogesterone caproate, as evaluated from 4 patients in the study who reached full-term in their pregnancies, was 16.4 (±3.6) days. The elimination half-life of the mono-hydroxylated metabolites was 19.7 (±6.2) days. Distribution Hydroxyprogesterone caproate binds extensively to plasma proteins including albumin and corticosteroid binding globulins. Metabolism In vitro studies have shown that hydroxyprogesterone caproate can be metabolized by human hepatocytes, both by phase I and phase II reactions. Hydroxyprogesterone caproate undergoes extensive reduction, hydroxylation and conjugation. The conjugated metabolites include sulfated, glucuronidated and acetylated products. In vitro data indicate that the metabolism of hydroxyprogesterone caproate is predominantly mediated by CYP3A4 and CYP3A5. The in vitro data indicate that the caproate group is retained during metabolism of hydroxyprogesterone caproate. Excretion Both conjugated metabolites and free steroids are excreted in the urine and feces, with the conjugated metabolites being prominent. Following intramuscular administration to pregnant women at 10-12 weeks gestation, approximately 50% of a dose was recovered in the feces and approximately 30% recovered in the urine. Specific Populations Renal Impairment The effect of renal impairment on the pharmacokinetics of Makena has not been evaluated. Hepatic Impairment The effect of hepatic impairment on the pharmacokinetics of Makena has not been evaluated. Drug Interactions Cytochrome P450 (CYP) enzymes: An in vitro inhibition study using human liver microsomes and CYP isoform-selective substrates indicated that hydroxyprogesterone caproate increased the metabolic rate of CYP1A2, CYP2A6, and CYP2B6 by approximately 80%, 150%, and 80%, respectively. However, in another in vitro study using human hepatocytes under conditions where the prototypical inducers or inhibitors caused the anticipated increases or decreases in CYP enzyme activities, hydroxyprogesterone caproate did not induce or inhibit CYP1A2, CYP2A6, or CYP2B6 activity. Overall, the findings indicate that hydroxyprogesterone caproate has minimal potential for CYP1A2, CYP2A6, and CYP2B6 related drug-drug interactions at the clinically relevant concentrations. In vitro data indicated that therapeutic concentration of hydroxyprogesterone caproate is not likely to inhibit the activity of CYP2C8, CYP2C9, CYP2C19, CYP2D6, CYP2E1, and CYP3A4. Clinical Studies Clinical Trial To Evaluate Reduction Of Risk Of Preterm Birth In a multicenter, randomized, double-blind, vehicle (placebo)-controlled clinical trial, the safety and effectiveness of Makena for the reduction of the risk of spontaneous preterm birth was studied in women with a singleton pregnancy (age 16 to 43 years) who had a documented history of singleton spontaneous preterm birth (defined as delivery at less than 37 weeks of gestation following spontaneous preterm labor or premature rupture of membranes).1 At the time of randomization (between 16 weeks, 0 days and 20 weeks, 6 days of gestation), an ultrasound examination had confirmed gestational age and no known fetal anomaly. Women were excluded for prior progesterone treatment or heparin therapy during the current pregnancy, a history of thromboembolic disease, or maternal/obstetrical complications (such as current or planned cerclage, hypertension requiring medication, or a seizure disorder). A total of 463 pregnant women were randomized to receive either Makena (N=310) or vehicle (N=153) at a dose of 250 mg administered weekly by intramuscular injection starting between 16 weeks, 0 days and 20 weeks, 6 days of gestation, and continuing until 37 weeks of gestation or delivery. Demographics of the Makena-treated women were similar to those in the control group, and included: 59.0% Black, 25.5% Caucasian, 13.9% Hispanic and 0.6% Asian. The mean body mass index was 26.9 kg/m². The proportions of women in each treatment arm who delivered at < 37 (the primary study endpoint), < 35, and < 32 weeks of gestation are displayed in Table 5. Table 5 : Proportion of Subjects Delivering at < 37, < 35 and < 32 Weeks Gestational Age (ITT Population) Delivery Outcome Makena1 (N=310) % Control (N=153) % Treatment difference and 95% Confidence Interval2 <37 weeks 37.1 54.9 -17.8% [-28.0%, -7.4%] <35 weeks 21.3 30.7 -9.4% [-19.0%, -0.4%] <32 weeks 11.9 19.6 -7.7% [-16.1%, -0.3%] 1 Four Makena-treated subjects were lost to follow-up. They were counted as deliveries at their gestational ages at time of last contact (184, 220, 343 and 364 weeks). 2 Adjusted for interim analysis. Compared to controls, treatment with Makena reduced the proportion of women who delivered preterm at < 37 weeks. The proportions of women delivering at < 35 and < 32 weeks also were lower among women treated with Makena. The upper bounds of the confidence intervals for the treatment difference at < 35 and < 32 weeks were close to zero. Inclusion of zero in a confidence interval would indicate the treatment difference is not statistically significant. Compared to the other gestational ages evaluated, the number of preterm births at < 32 weeks was limited. After adjusting for time in the study, 7.5% of Makena-treated subjects delivered prior to 25 weeks compared to 4.7% of control subjects; see Figure 1. Figure 1 : Proportion of Women Remaining Pregnant as a Function of Gestational Age The rates of fetal losses and neonatal deaths in each treatment arm are displayed in Table 6. Due to the higher rate of miscarriages and stillbirths in the Makena arm, there was no overall survival difference demonstrated in this clinical trial. Table 6 : Fetal Losses and Neonatal Deaths Complication Makena N=306A n (%) B Control N=153 n (%) B Miscarriages <20 weeks gestationC 5 (2.4) 0 Stillbirth 6 (2.0) 2 (1.3) Antepartum stillbirth 5 (1.6) 1 (0.6) Intrapartum stillbirth 1 (0.3) 1 (0.6) Neonatal deaths 8 (2.6) 9 (5.9) Total Deaths 19 (6.2) 11 (7.2) A Four of the 310 Makena-treated subjects were lost to follow-up and stillbirth or neonatal status could not be determined B Percentages are based on the number of enrolled subjects and not adjusted for time on drug C Percentage adjusted for the number of at risk subjects (n=209 for Makena, n=107 for control) enrolled at <20 weeks gestation. A composite neonatal morbidity/mortality index evaluated adverse outcomes in livebirths. It was based on the number of neonates who died or experienced respiratory distress syndrome, bronchopulmonary dysplasia, grade 3 or 4 intraventricular hemorrhage, proven sepsis, or necrotizing enterocolitis. Although the proportion of neonates who experienced 1 or more events was numerically lower in the Makena arm (11.9% vs. 17.2%), the number of adverse outcomes was limited and the difference between arms was not statistically significant. Infant Follow-Up Safety Study Infants born to women enrolled in this study, and who survived to be discharged from the nursery, were eligible for participation in a follow-up safety study. Of 348 eligible offspring, 79.9% enrolled: 194 children of Makena-treated women and 84 children of control subjects. The primary endpoint was the score on the Ages & Stages Questionnaire (ASQ), which evaluates communication, gross motor, fine motor, problem solving, and personal/social parameters. The proportion of children whose scores met the screening threshold for developmental delay in each developmental domain was similar for each treatment group.2 REFERENCES 1 Meis PJ, Klebanoff M, Thom E, et al. Prevention of recurrent preterm delivery by 17 alpha-hydroxyprogesterone caproate. N Engl J Med. 2003;348(24):2379-85. 2 Northen A, Norman G, Anderson K, et al. Follow-up of children exposed in utero to 17 alpha-hydroxyprogesterone caproate. Obstet & Gynecol. 2007;110:865-872.

Find Lowest Prices on MAKENA® (hydroxyprogesterone) Caproate Injection for Intramuscular use. DESCRIPTION The active pharmaceutical ingredient in Makena is hydroxyprogesterone caproate. The chemical name for hydroxyprogesterone caproate is pregn-4-ene-3,20dione, 17[(1-oxohexyl)oxy]. It has an empirical formula of C27H40O4 and a molecular weight of 428.60. Hydroxyprogesterone caproate exists as white to practically white crystals or powder with a melting point of 120°-124°C. The structural formula is: Makena is a clear, yellow, sterile, non-pyrogenic solution for intramuscular injection. Each 1 mL single dose vial contains hydroxyprogesterone caproate USP, 250 mg/mL (25% w/v), in castor oil USP (30.6% v/v) and benzyl benzoate USP (46% v/v). Each 5 mL multidose vial contains hydroxyprogesterone caproate USP, 250 mg/mL (25% w/v), in castor oil USP (28.6% v/v) and benzyl benzoate USP (46% v/v) with the preservative benzyl alcohol NF (2% v/v).

INDICATIONS Makena is a progestin indicated to reduce the risk of preterm birth in women with a singleton pregnancy who have a history of singleton spontaneous preterm birth. The effectiveness of Makena is based on improvement in the proportion of women who delivered < 37 weeks of gestation. There are no controlled trials demonstrating a direct clinical benefit, such as improvement in neonatal mortality and morbidity. Limitation Of Use While there are many risk factors for preterm birth, safety and efficacy of Makena has been demonstrated only in women with a prior spontaneous singleton preterm birth. It is not intended for use in women with multiple gestations or other risk factors for preterm birth. DOSAGE AND ADMINISTRATION Dosing Administer intramuscularly at a dose of 250 mg (1 mL) once weekly (every 7 days) by a healthcare provider Begin treatment between 16 weeks, 0 days and 20 weeks, 6 days of gestation Continue administration once weekly until week 37 (through 36 weeks, 6 days) of gestation or delivery, whichever occurs first Preparation And Administration Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Makena is a clear, yellow solution. Do not use if solid particles appear or if the solution is cloudy. Instructions For Administration Clean the vial top with an alcohol swab before use. Draw up 1 mL of drug into a 3 mL syringe with an 18 gauge needle. Change the needle to a 21 gauge 1½ inch needle. After preparing the skin, inject in the upper outer quadrant of the gluteus maximus. The solution is viscous and oily. Slow injection (over one minute or longer) is recommended. Applying pressure to the injection site may minimize bruising and swelling. If the 5 mL multidose vial is used, discard any unused product 5 weeks after first use. HOW SUPPLIED Dosage Forms And Strengths Makena (250 mg/mL) is a sterile solution of hydroxyprogesterone caproate in castor oil for injection. Each 1 mL single dose vial contains 250 mg hydroxyprogesterone caproate. Each 5 mL multidose vial contains 1250 mg hydroxyprogesterone caproate. Storage And Handling Makena (NDC 64011-247-02) is supplied as 1 mL of a sterile solution in a single dose glass vial. Each 1 mL vial contains hydroxyprogesterone caproate USP, 250 mg/mL (25% w/v), in castor oil USP (30.6% v/v) and benzyl benzoate USP (46% v/v). Single unit carton: Contains one 1 mL single dose vial of Makena containing 250 mg of hydroxyprogesterone caproate. Makena (NDC 64011-243-01) is supplied as 5 mL of a sterile solution in a multidose glass vial. Each 5 mL vial contains hydroxyprogesterone caproate USP, 250 mg/mL (25% w/v), in castor oil USP (28.6% v/v) and benzyl benzoate USP (46% v/v) with the preservative benzyl alcohol NF (2% v/v). Single unit carton: Contains one 5 mL multidose vial of Makena (250 mg/mL) containing 1250 mg of hydroxyprogesterone caproate. Store at controlled room temperature [15°-30° C (59°-86° F)]. Use multidose vials within 5 weeks after first use. Caution: Protect vial from light. Store vial in its box. Store upright. Distributed by: AMAG Pharmaceuticals, Inc. Waltham, MA 02451. Revised: Aug 2017

PATIENT INFORMATION Makena (mah-KEE-na) (hydroxyprogesterone caproate) Injection 250 mg/mL Read this Patient Information Leaflet before you receive Makena. There may be new information. This information does not take the place of talking to your healthcare provider about your medical condition or treatment. What is Makena? Makena is a prescription hormone medicine (progestin) used in women who are pregnant and who have delivered a baby too early (preterm) in the past. Makena is used in these women to help lower the risk of having a preterm baby again. Makena is for women who: Are pregnant with one baby Have had a preterm delivery of one baby in the past How well does Makena work? Makena was studied in women who were at risk for having a preterm baby because they had previously given birth to a preterm baby. In the main study, about 37 of 100 women who received Makena gave birth preterm (before 37 weeks of pregnancy), compared to about 55 of 100 women who did not receive Makena. Another study of Makena is going on to see whether Makena reduces the number of babies who have serious problems shortly after birth or who die. It is not known whether Makena is safe and effective in women who have other risk factors for preterm birth. It is not known whether Makena is safe and effective in women less than 16 years old. Makena is not intended for use to stop active preterm labor. Who should not receive Makena? Makena should not be used if you: Have now or have had a history of blood clots or other blood clotting problems Have now or have had a history of breast cancer or other hormone-sensitive cancers Have unusual vaginal bleeding not related to your current pregnancy Have yellowing of your skin due to liver problems during your pregnancy Have liver problems, including liver tumors Have uncontrolled high blood pressure What should I tell my healthcare provider before receiving Makena? Before you receive Makena, tell your healthcare provider if you have: An allergy to hydroxyprogesterone caproate, castor oil, or any of the other ingredients in Makena. See the end of this patient leaflet for a complete list of the ingredients in Makena. Diabetes or prediabetes Epilepsy Migraine headaches Asthma Heart problems Kidney problems Depression High blood pressure Tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. Makena may affect the way other medicines work, and other medicines may affect how Makena works. Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist when you get a new medication. How should I receive Makena? Do not give yourself Makena injections. A healthcare professional will give you the Makena injection into your hip area (upper outer area of the buttocks) once a week (every 7 days). You will start receiving Makena injections anytime from 16 weeks and 0 days of your pregnancy up to 20 weeks and 6 days of your pregnancy. You will continue to receive Makena injections once weekly until week 37 of your pregnancy or when your baby is delivered, whichever happens first. Makena comes in ready-to-use vials. There are either 1 or 5 doses of medicine in each vial. Your healthcare professional should give you only one dose (1 mL) of Makena as prescribed each week. Makena supplied in multidose 5 mL vials should be used within 5 weeks after the first use. It is very important that you do not miss a dose of Makena and that you continue to receive the medicine once a week. If you miss a dose, talk to your healthcare provider for specific directions on how to get back on schedule. What are the possible side effects of Makena? Makena may cause serious side effects, including: Blood clots. Symptoms of a blood clot may include: Leg swelling Redness in your leg A spot on your leg that is warm to touch Leg pain that worsens when you bend your foot Allergic reactions. Symptoms of an allergic reaction may include: Hives Itching Swelling of the face Call your healthcare provider right away if you get any of the symptoms above. Depression Yellowing of your skin and the whites of your eyes The most common side effects of Makena include: Pain, swelling, itching, bruising or a hard bump at the injection site Hives Itching Nausea Diarrhea Call your healthcare provider if you have the following at your injection site: Increased pain over time Oozing of blood or fluid Swelling Tell your healthcare provider if you have any side effect that bothers you or that does not go away. These are not all the possible side effects of Makena. For more information, ask your healthcare provider or pharmacist. In a clinical study, certain complications or events associated with pregnancy occurred more often in women who received Makena compared to women who did not receive Makena, including: Miscarriage (pregnancy loss before 20 weeks of pregnancy) Stillbirth (fetal death occurring during or after the 20th week of pregnancy) Hospital admission for preterm labor Preeclampsia (high blood pressure and too much protein in your urine) Gestational hypertension (high blood pressure caused by pregnancy) Gestational diabetes Oligohydramnios (low amniotic fluid levels) Call your healthcare provider for medical advice about side effects or pregnancy complications. You may report side effects to FDA at 1-800-FDA1088. How should I store Makena? Store Makena at room temperature (59° to 86°F or 15° to 30°C) Store Makena in the original box to protect it from light Store the Makena box upright Makena 5 mL multidose vials should be used within 5 weeks after the first use Keep Makena out of the reach of children General information about the safe and effective use of Makena Medicines are sometimes prescribed for purposes other than those mentioned in the Patient Information Leaflets. Do not take Makena for conditions for which it was not prescribed. Do not give Makena to other people, even if they have the same condition you have. It may harm them. This leaflet summarizes the most important information about Makena. If you would like more information, talk with your healthcare provider. You can ask for information about Makena that is written for healthcare professionals. For more information, go to www.makena.com or call AMAG Pharmaceuticals Customer Service at the toll free number 1-877-411-2510. To refill a prescription or to check on prescription status, call the Makena Care Connection at the toll free number 1-800-847-3418. What are the ingredients in Makena? Active ingredient: hydroxyprogesterone caproate Inactive ingredients: castor oil and benzyl benzoate. 5 mL multidose vials also contain benzyl alcohol (a preservative).

SIDE EFFECTS For the most serious adverse reactions to the use of progestins, see WARNINGS AND PRECAUTIONS. Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to the rates in the clinical trials of another drug and may not reflect the rates observed in practice. In a vehicle (placebo)-controlled clinical trial of 463 pregnant women at risk for spontaneous preterm delivery based on obstetrical history, 310 received 250 mg of Makena and 153 received a vehicle formulation containing no drug by a weekly intramuscular injection beginning at 16 to 20 weeks of gestation and continuing until 37 weeks of gestation or delivery, whichever occurred first.1 [See Clinical Studies] Certain pregnancy-related fetal and maternal complications or events were numerically increased in the Makena-treated subjects as compared to control subjects, including miscarriage and stillbirth, admission for preterm labor, preeclampsia or gestational hypertension, gestational diabetes, and oligohydramnios (Tables 1 and 2). Table 1 : Selected Fetal Complications Pregnancy Complication Makena n/N Control n/N Miscarriage (< 20 weeks)1 5/209 0/107 Stillbirth (≥ 20 weeks)2 6/305 2/153 1 N = Total number of subjects enrolled prior to 20 weeks 0 days 2 N = Total number of subjects at risk ≥ 20 weeks Table 2 : Selected Maternal Complications Pregnancy Complication Makena N=310 % Control N=153 % Admission for preterm labor1 16.0 13.8 Preeclampsia or gestational hypertension 8.8 4.6 Gestational diabetes 5.6 4.6 Oligohydramnios 3.6 1.3 1 Other than delivery admission. Common Adverse Reactions The most common adverse reaction was injection site pain, which was reported after at least one injection by 34.8% of the Makena group and 32.7% of the control group. Table 3 lists adverse reactions that occurred in ≥ 2% of subjects and at a higher rate in the Makena group than in the control group. Table 3 : Adverse Reactions Occurring in ≥ 2% of Makena-Treated Subjects and at a Higher Rate than Control Subjects Preferred Term Makena N=310 % Control N=153 % Injection site pain 34.8 32.7 Injection site swelling 17.1 7.8 Urticaria 12.3 11.1 Pruritus 7.7 5.9 Injection site pruritus 5.8 3.3 Nausea 5.8 4.6 Injection site nodule 4.5 2.0 Diarrhea 2.3 0.7 In the clinical trial, 2.2% of subjects receiving Makena were reported as discontinuing therapy due to adverse reactions compared to 2.6% of control subjects. The most common adverse reactions that led to discontinuation in both groups were urticaria and injection site pain/swelling (1% each). Pulmonary embolus in one subject and injection site cellulitis in another subject were reported as serious adverse reactions in Makena-treated subjects. Postmarketing Experience The following adverse reactions have been identified during postapproval use of Makena. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Body as a whole: Local injection site reactions (including erythema, urticaria, rash, irritation, hypersensitivity, warmth); fatigue; fever; hot flashes/flushes Digestive disorders: Vomiting Infections: Urinary tract infection Nervous system disorders: Headache, dizziness Pregnancy, puerperium and perinatal conditions: Cervical incompetence, premature rupture of membranes Reproductive system and breast disorders: Cervical dilation, shortened cervix Respiratory disorders: Dyspnea, chest discomfort Skin: Rash DRUG INTERACTIONS In vitro drug-drug interaction studies were conducted with Makena. [See CLINICAL PHARMACOLOGY] No in vivo drug-drug interaction studies were conducted with Makena. REFERENCES 1 Meis PJ, Klebanoff M, Thom E, et al. Prevention of recurrent preterm delivery by 17 alpha-hydroxyprogesterone caproate. N Engl J Med. 2003;348(24):2379-85.

WARNINGS Included as part of the PRECAUTIONS section. PRECAUTIONS Thromboembolic Disorders Discontinue Makena if an arterial or deep venous thrombotic or thromboembolic event occurs. Allergic Reactions Allergic reactions, including urticaria, pruritus and angioedema, have been reported with use of Makena or with other products containing castor oil. Consider discontinuing the drug if such reactions occur. Decrease In Glucose Tolerance A decrease in glucose tolerance has been observed in some patients on progestin treatment. The mechanism of this decrease is not known. Carefully monitor prediabetic and diabetic women while they are receiving Makena. Fluid Retention Because progestational drugs may cause some degree of fluid retention, carefully monitor women with conditions that might be influenced by this effect (e.g., preeclampsia, epilepsy, migraine, asthma, cardiac or renal dysfunction). Depression Monitor women who have a history of clinical depression and discontinue Makena if clinical depression recurs. Jaundice Carefully monitor women who develop jaundice while receiving Makena and consider whether the benefit of use warrants continuation. Hypertension Carefully monitor women who develop hypertension while receiving Makena and consider whether the benefit of use warrants continuation. Patient Counseling Information See FDA-approved patient labeling (PATIENT INFORMATION). Counsel patients that Makena injections may cause pain, soreness, swelling, itching or bruising. Inform the patient to contact her physician if she notices increased discomfort over time, oozing of blood or fluid, or inflammatory reactions at the injection site [see ADVERSE REACTIONS]. Nonclinical Toxicology Carcinogenesis, Mutagenesis, Impairment Of Fertility Hydroxyprogesterone caproate has not been adequately evaluated for carcinogenicity. No reproductive or developmental toxicity or impaired fertility was observed in a multigenerational study in rats. Makena administered intramuscularly, at gestational exposures up to 5 times the recommended human dose, had no adverse effects on the parental (F0) dams, their developing offspring (F1), or the latter offspring's ability to produce a viable, normal second (F2) generation. Use In Specific Populations Pregnancy Pregnancy Category B There are no adequate and well-controlled studies of Makena use in women during the first trimester of pregnancy. Data from a vehicle (placebo)-controlled clinical trial of 310 pregnant women who received Makena at weekly doses of 250 mg by intramuscular injection in their second and third trimesters1, as well as long-term (2-5 years) follow-up safety data on 194 of their infants2, did not demonstrate any teratogenic risks to infants from in utero exposure to Makena. Reproduction studies have been performed in mice and rats at doses up to 95 and 5, respectively, times the human dose and have revealed no evidence of impaired fertility or harm to the fetus due to Makena. Makena administration produced embryolethality in rhesus monkeys but not in cynomolgus monkeys exposed to 1 and 10 times the human dose equivalent every 7 days between days 20 and 146 of gestation. There were no teratogenic effects in either species. Labor And Delivery Makena is not intended for use to stop active preterm labor. The effect of Makena in active labor is unknown. Nursing Mothers Discontinue Makena at 37 weeks of gestation or upon delivery. Detectable amounts of progestins have been identified in the milk of mothers receiving progestin treatment. Many studies have found no adverse effects of progestins on breastfeeding performance, or on the health, growth, or development of the infant. Pediatric Use Makena is not indicated for use in children. Safety and effectiveness in pediatric patients less than 16 years of age have not been established. A small number of women under age 18 years were studied; safety and efficacy are expected to be the same in women aged 16 years and above as for users 18 years and older. [See Clinical Studies] Geriatric Use Makena is not intended for use in postmenopausal women. Safety and effectiveness in postmenopausal women have not been established. Renal Impairment No studies have been conducted to examine the pharmacokinetics of Makena in patients with renal impairment. Hepatic Impairment No studies have been conducted to examine the pharmacokinetics of Makena in patients with hepatic impairment. Makena is extensively metabolized and hepatic impairment may reduce the elimination of Makena.