Cetrorelix Acetate For Injection

INDICATIONS AND USAGE Cetrorelix Acetate for Injection is indicated for the inhibition of premature LH surges in women undergoing controlled ovarian stimulation.

DOSAGE AND ADMINISTRATION Ovarian stimulation therapy with gonadotropins (FSH, hMG) is started on cycle Day 2 or 3. The dose of gonadotropins should be adjusted according to individual response. Cetrorelix Acetate for Injection 0.25 mg may be administered subcutaneously once daily during the early- to mid-follicular phase. Cetrorelix Acetate for Injection 0.25 mg is administered on either stimulation day 5 (morning or evening) or day 6 (morning) and continued daily until the day of hCG administration. When assessment by ultrasound shows a sufficient number of follicles of adequate size, hCG is administered to induce ovulation and final maturation of the oocytes. No hCG should be administered if the ovaries show an excessive response to the treatment with gonadotropins to reduce the chance of developing ovarian hyperstimulation syndrome (OHSS). Administration Cetrorelix Acetate for Injection 0.25 mg can be administered by the patient herself after appropriate instructions by her doctor. Directions for using Cetrorelix Acetate for Injection 0.25 mg with the enclosed needles and pre-filled syringe: Wash hands thoroughly with soap and water. Flip off the plastic cover of the vial and wipe the aluminum ring and the rubber stopper with an alcohol swab. Twist the injection needle with the yellow mark (20 gauge) on the pre-filled syringe. Push the needle through the center of the rubber stopper of the vial and slowly inject the solvent into the vial. Leaving the syringe in the vial, gently swirl the vial until the solution is clear and without residues. Avoid forming bubbles. Draw the total contents of the vial into the syringe. If necessary, invert the vial and pull back the needle as far as needed to withdraw the entire contents of the vial. Replace the needle with the yellow mark by the injection needle with the grey mark (27 gauge). Invert the syringe and push the plunger until all air bubbles have been expelled. Choose an injection site in the lower abdominal area, preferably around, but staying at least one inch away from the navel. Choose a different injection site each day to minimize local irritation. Use a second alcohol swab to clean the skin at the injection site and allow alcohol to dry. Gently pinch up the skin surrounding the site of injection. Inject the prescribed dose as directed by your doctor, nurse or pharmacist. Discard unused portion. Use the syringe and needles only once. Dispose of the syringe and needles properly after use. If available, use a medical waste container for disposal.

ADVERSE REACTIONS The safety of cetrorelix acetate for injection in 949 patients undergoing controlled ovarian stimulation in clinical studies was evaluated. Women were between 19 and 40 years of age (mean: 32). 94.0% of them were Caucasian. Cetrorelix Acetate for Injection was given in doses ranging from 0.1 mg to 5 mg as either a single or multiple dose. Table 3 shows systemic adverse events, reported in clinical studies without regard to causality, from the beginning of cetrorelix acetate for injection treatment until confirmation of pregnancy by ultrasound at an incidence ≥ 1% in cetrorelix acetate for injection treated subjects undergoing COS. Table 3: Adverse Events in ≥1% (WHO preferred term) Cetrorelix Acetate for Injection N=949 % (n) Ovarian Hyperstimulation Syndrome Intensity moderate or severe, or WHO Grade II or III, respectively 3.5 (33) Nausea 1.3 (12) Headache 1.1 (10) Local site reactions (e.g. redness, erythema, bruising, itching, swelling, and pruritus) were reported. Usually, they were of a transient nature, mild intensity and short duration. During post-marketing surveillance, cases of mild to moderate Ovarian Hyperstimulation syndrome and cases of hypersensitivity reactions including anaphylactoid reactions have been reported. Two stillbirths were reported in Phase 3 studies of cetrorelix acetate for injection. Congenital Anomalies Clinical follow-up studies of 316 newborns of women administered cetrorelix acetate for injection were reviewed. One infant of a set of twin neonates was found to have anencephaly at birth and died after four days. The other twin was normal. Developmental findings from ongoing baby follow-up included a child with a ventricular septal defect and another child with bilateral congenital glaucoma. Four pregnancies that resulted in therapeutic abortion in Phase 2 and Phase 3 controlled ovarian stimulation studies had major anomalies (diaphragmatic hernia, trisomy 21, Klinefelter syndrome, polymalformation, and trisomy 18). In three of these four cases, intracytoplasmic sperm injection (ICSI) was the fertilization method employed; in the fourth case, in vitro fertilization (IVF) was the method employed. The minor congenital anomalies reported include: supernumerary nipple, bilateral strabismus, imperforate hymen, congenital nevi, hemangiomata, and QT syndrome. The causal relationship between the reported anomalies and cetrorelix acetate for injection is unknown. Multiple factors, genetic and others (including, but not limited to ICSI, IVF, gonadotropins, and progesterone) make causal attribution difficult to study.

Pharmacokinetics The pharmacokinetic parameters of single and multiple doses of cetrorelix acetate for injection in adult healthy female subjects are summarized in Table 1. Table 1: Pharmacokinetic parameters of Cetrorelix Acetate for Injection following 3 mg single or 0.25 mg single and multiple (daily for 14 days) subcutaneous (sc) administration. Single dose 3 mg Single dose 0.25 mg Multiple dose 0.25 mg t max Time to reach observed maximum plasma concentration t 1/2 Elimination half-life C max Maximum plasma concentration; multiple dose C ss, max AUC Area under the curve; single dose AUC 0-inf , multiple dose AUCt CL Total plasma clearance Vz Volume of distribution Geometric mean (95% CI ln ), No. of subjects 12 12 12 t max median (min-max) [h] 1.5 (0.5-2) 1.0 (0.5-1.5) 1.0 (0.5-2) t 1/2 [h] 62.8 (38.2-108) 5.0 (2.4-48.8) 20.6 (4.1-179.3) C max [ng/ml] 28.5 (22.5-36.2) 4.97 (4.17-5.92) 6.42 (5.18-7.96) AUC [ng∙h/ml] 536 (451-636) 31.4 (23.4-42.0) 44.5 (36.7-54.2) CL arithmetic mean, [ml/min∙kg] 1.28 Based on iv administration (n=6, separate study 0013) Vz [l/kg] 1.16 Absorption Cetrorelix Acetate for Injection is rapidly absorbed following subcutaneous injection, maximal plasma concentrations being achieved approximately one to two hours after administration. The mean absolute bioavailability of cetrorelix acetate for injection following subcutaneous administration to healthy female subjects is 85%. Distribution The volume of distribution of cetrorelix acetate for injection following a single intravenous dose of 3 mg is about 1 l/kg. In vitro protein binding to human plasma is 86%. Cetrorelix Acetate for Injection concentrations in follicular fluid and plasma were similar on the day of oocyte pick-up in patients undergoing controlled ovarian stimulation. Following subcutaneous administration of cetrorelix acetate for injection 0.25 mg and 3 mg, plasma concentrations of cetrorelix were below or in the range of the lower limit of quantitation on the day of oocyte pick-up and embryo transfer. Metabolism After subcutaneous administration of 10 mg cetrorelix acetate for injection to females and males, cetrorelix acetate for injection and small amounts of (1-9), (1-7), (1-6), and (1-4) peptides were found in bile samples over 24 hours. In in vitro studies, cetrorelix acetate for injection was stable against phase I- and phase II-metabolism. Cetrorelix Acetate for Injection was transformed by peptidases, and the (1-4) peptide was the predominant metabolite. Excretion Following subcutaneous administration of 10 mg cetrorelix to males and females, only unchanged cetrorelix was detected in urine. In 24 hours, cetrorelix and small amounts of the (1-9), (1-7), (1-6), and (1-4) peptides were found in bile samples. 2-4% of the dose was eliminated in the urine as unchanged cetrorelix, while 5-10% was eliminated as cetrorelix and the four metabolites in bile. Therefore, only 7-14% of the total dose was recovered as unchanged cetrorelix and metabolites in urine and bile up to 24 hours. The remaining portion of the dose may not have been recovered since bile and urine were not collected for a longer period of time. Special Populations Pharmacokinetic investigations have not been performed either in subjects with impaired renal or liver function, or in the elderly, or in children (see PRECAUTIONS ). Pharmacokinetic differences in different races have not been determined. There is no evidence of differences in pharmacokinetic parameters for cetrorelix acetate for injection between healthy subjects and patients undergoing controlled ovarian stimulation.