Generic Name: Goserelin Acetate
VA Class: AN500
Chemical Name: 2-(Aminocarbonyl)hydrazide-6-[O-(1,1-dimethylethyl)-d-serine]-10-deglycinamide luteinizing hormone-releasing factor (pig)
Molecular Formula: C59H84N18O14
CAS Number: 65807-02-5
Medically reviewed by Drugs.com. Last updated on Oct 16, 2017.
Uses for Zoladex
Palliative treatment of advanced prostate cancer.1 2 4 5 6 9 10 17 18 Considered one of several first-line options for hormonal therapy; other options include orchiectomy, estrogens, and antiandrogens.9
In clinical studies, goserelin (3.6 mg every 4 weeks) was as effective as orchiectomy.1 2 4 5 17 18 Clinical outcome in patients receiving goserelin 10.8 mg every 12 weeks expected to be similar to that of patients receiving goserelin 3.6 mg every 4 weeks.2 6
Dysfunctional Uterine Bleeding
Zoladex Dosage and Administration
Advanced Prostate CancerSub-Q
Stage III[C]) prostate cancer (as an adjunct to radiation therapy): One implant containing 3.6 mg every 4 weeks; initiate therapy on the first day of radiation or during the last week of radiation.8 10
Stage B2-C Prostate CancerSub-Q
One implant containing 3.6 mg every 4 weeks starting 8 weeks prior to radiation therapy and continuing for a total of 4 doses recommended by the manufacturer.1 2 7 Alternatively, one implant containing 3.6 mg implanted 8 weeks prior to radiation therapy and followed by one implant containing 10.8 mg on day 28 (4 weeks after initial 3.6-mg dose) recommended by the manufacturer.1 2
One implant containing 3.6 mg every 4 weeks for 6 consecutive months.1 3 11 12 Retreatment with additional courses currently not recommended; safety has only been established for a 6-month course of therapy; there are concerns about potential long-term effects on bone density.1 Assess bone density if retreatment for recurrence is considered.1 (See Musculoskeletal Effects under Cautions.)
One implant containing 3.6 mg every 4 weeks.1 13 Consider dosage increase to 7.2 mg (3.6 mg implanted to 2 different sites) every 4 weeks in women whose serum estradiol concentrations are not reduced to postmenopausal levels after 8 weeks.1 13 Intended for long-term administration unless clinically inappropriate.1 2
Dysfunctional Uterine Bleeding
One implant containing 3.6 mg 4 weeks before endometrial ablation.1 Alternatively, the initial 3.6-mg dose of goserelin can be followed by a second 3.6-mg dose 4 weeks after the first dose; surgery should be performed 2–4 weeks after the second dose.1
Maximum 3.6 mg every 4 weeks for 6 consecutive months.1
Cautions for Zoladex
Known or suspected pregnancy unless being used for palliative treatment of advanced breast cancer.1
Abnormal vaginal bleeding of unknown etiology.1
The implant containing 10.8 mg of goserelin should not be used in women; insufficient data available to determine whether this preparation is associated with reliable suppression of serum estradiol.2
Fetal/Neonatal Morbidity and Mortality
Women of childbearing potential should avoid pregnancy and use an effective nonhormonal method of contraception during therapy and for 12 weeks following the last dose of goserelin.1 21 Continuous use of goserelin usually inhibits ovulation and stops menstruation; however, prevention of pregnancy is not ensured.1
Exclude pregnancy before initiating therapy in women with benign gynecologic conditions.1 If a patient with endometriosis or undergoing endometrial thinning becomes pregnant during therapy, discontinue the drug and advise patient about potential fetal hazard.1 2
If used during pregnancy in women with advanced breast cancer, apprise of potential fetal hazard.1
Initial Worsening of Hormone-dependent Disease
Possible worsening of signs and/or symptoms of prostate or breast cancer (e.g., increased bone pain) and/or development of new manifestations due to transient increases in serum testosterone (in men) or estrogen (in women) concentrations during the initial weeks of therapy.1 2 Concomitant therapy with an antiandrogen (e.g., bicalutamide, flutamide, nilutamide) 1 week before and during the first few weeks of goserelin therapy may minimize disease flare in men with prostate cancer.4 9
Spinal cord compression and/or ureteral obstruction reported in men with prostate cancer.1 2 If spinal cord compression or renal impairment secondary to ureteral obstruction develops, institute standard treatment of these complications; consider immediate orchiectomy in extreme cases.1 2
Caution in patients at particular risk of developing spinal cord compression or ureteral obstruction; observe closely during the first month of therapy.1 2 4 Treat spinal cord compression or ureteral obstruction before initiating goserelin.1 2 4
Possible hyperglycemia and increased risk of diabetes in patients receiving GnRH agonists for treatment of prostate cancer.1 2 23 Studies evaluating risk of diabetes in women and children receiving GnRH agonists not performed to date.22
Evaluate patients for risk factors for diabetes and carefully weigh benefits and risks of GnRH agonist therapy before selecting treatment for prostate cancer.23
Possible increased risk of cardiovascular disease (e.g., MI, sudden cardiac death, stroke) in patients receiving GnRH agonists for treatment of prostate cancer.1 2 23 Studies evaluating risk of cardiovascular disease in women and children receiving GnRH agonists not performed to date.22
Cases of serious venous and arterial thromboembolism (e.g., DVT, PE, MI, TIA, stroke) reported in women receiving GnRH agonists.1
Possible transient changes in BP (hypotension or hypertension).1
Possible increased total cholesterol, LDL cholesterol, and triglycerides and decreased HDL cholesterol.1
Pituitary apoplexy, a clinical syndrome resulting from infarction of the pituitary gland, reported rarely.1 2 Most cases occur within 2 weeks of the first dose, sometimes within the first hour.1 2 If manifestations occur (e.g., sudden headache, vomiting, visual changes, ophthalmoplegia, altered mental status, sometimes cardiovascular collapse), immediate medical attention required.1 2 In most cases, pituitary adenoma diagnosed.1 2
Women Undergoing Endometrial Ablation
Determine serum testosterone concentrations periodically in patients with prostate cancer in whom the anticipated clinical or biochemical response to goserelin has not been achieved.2
Reduction in serum prostate specific antigen (PSA) concentrations may provide information about duration of progression-free status in men with prostate cancer.9 However, decreases in PSA concentrations may occur independent of tumor response; clinicians cannot rely solely on PSA concentrations to monitor a patient’s response.9
Decreases in bone mineral density (BMD), osteoporosis, and bone fracture reported in men; decreases in BMD reported in women.1 2 Currently available data suggest that recovery of bone loss occurs following cessation of therapy most women.1
For management of endometriosis in women, concurrent use of hormone replacement therapy or bisphosphonates (e.g., alendronate) may minimize bone mineral loss associated with GnRH agonist therapy without compromising efficacy.1 19
Risk of BMD loss may be increased in patients with a history of prior therapy that resulted in BMD loss and/or patients with risk factors for decreased BMD (e.g., chronic alcohol abuse, tobacco abuse, family history of osteoporosis, chronic use of anticonvulsants or corticosteroids).1
Category D (advanced breast cancer); category X (endometriosis, endometrial-thinning agent)1 (See Fetal/Neonatal Morbidity and Mortality under Cautions.)
Incidence of adverse effects not increased in patients with renal impairment receiving goserelin 10.8 mg.2
Common Adverse Effects
Interactions for Zoladex
Long-term administration of goserelin 10.8 mg in patients with renal impairment not associated with accumulation of goserelin.2
Plasma Protein Binding
Similar total body clearance and elimination half-life in normal subjects and patients with moderate hepatic impairment.2 Pharmacokinetic data in patients with severe hepatic insufficiency not available.2
Initially, circulating levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH), testosterone, and estradiol surge transiently.1 2 3 4 5 Following chronic and continuous administration (generally, 2–4 weeks after initiation of therapy), produces a sustained decrease in LH and FSH secretion and a marked reduction of testicular and ovarian steroidogenesis.1 2 3 4 5
Reductions in serum testosterone concentrations in males receiving goserelin are comparable to those achieved after surgical castration (i.e., <50 ng/dL).1 2 4 5 6 17 Consequently, physiologic functions and tissues dependent on testosterone for maintenance become quiescent.1 2 4
In most premenopausal women, serum estradiol concentrations are reduced to levels comparable to those observed after menopause within 3 weeks of initiating therapy.1 3 5 Consequently, physiologic functions and tissues dependent on gonadal steroids (estrogen) for maintenance become quiescent.1 3
Advice to Patients
Possibility of increased risk of MI, sudden cardiac death, and stroke in men receiving GnRH agonists for the treatment of prostate cancer.1 2 23 Importance of being monitored for manifestations of cardiovascular disease.1 2 23
Necessity of advising women to avoid pregnancy (using nonhormonal contraception) during therapy and for 12 weeks after administration of the last 3.6-mg dose of goserelin.1 If used during pregnancy, advise patient of potential fetal hazard.1
Necessity of advising women not to breast-feed.1
Importance of women informing their clinician if regular menstruation persists.1 Women also should be advised that breakthrough bleeding or ovulation (with potential for conception) may occur if one or more successive doses of the drug are missed.1
Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.
Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.
3.6 mg (of goserelin)
Zoladex (available as prefilled disposable syringe)
10.8 mg (of goserelin)
Zoladex (available as prefilled disposable syringe)
AHFS DI Essentials™. © Copyright 2019, Selected Revisions October 16, 2017. American Society of Health-System Pharmacists, Inc., 4500 East-West Highway, Suite 900, Bethesda, Maryland 20814.
1. AstraZeneca. Zoladex, 3.6 mg (goserelin acetate implant) prescribing information. Wilmington, DE; 2010 Dec. Available at http://www.accessdata.fda.gov/drugsatfda_docs/label/2011/019726s054,020578s032lbl.pdf. Accessed 2011 May 26.
2. AstraZeneca. Zoladex, 3-month 10.8 mg (goserelin acetate implant) prescribing information. Wilmington, DE; 2010 Dec. Available at http://www.accessdata.fda.gov/drugsatfda_docs/label/2011/019726s054,020578s032lbl.pdf. Accessed 2011 May 26.
3. Perry CM, Brogden RN. Goserelin: a review of its pharmacodynamic and pharmacokinetic properties, and therapeutic use in benign gynaecologic disorders. Drugs. 1996; 51:319-46. http://www.ncbi.nlm.nih.gov/pubmed/8808170?dopt=AbstractPlus
4. Brogden RN, Faulds D. Goserelin: a review of its pharmacodynamic and pharmacokinetic properties and therapeutic efficacy in prostate cancer. Drugs Aging. 1995; 6:324-43. http://www.ncbi.nlm.nih.gov/pubmed/7613021?dopt=AbstractPlus
5. Cockshott ID. Clinical pharmacokinetics of goserelin. Clin Pharmacokinet. 2000; 39:27-48. http://www.ncbi.nlm.nih.gov/pubmed/10926349?dopt=AbstractPlus
6. Fernandez del Moral P, Dijkman GA, Debruyne FM et al. Three-month depot of goserelin acetate: clinical efficacy and endocrine profile: Dutch South East Cooperative Urological Group. Urology. 1996; 48:894-900. http://www.ncbi.nlm.nih.gov/pubmed/8973673?dopt=AbstractPlus
7. Pilepich MV, Krall JM, al-Sarraf M et al. Androgen deprivation with radiation therapy compared with radiation therapy alone for locally advanced prostatic cancer: a randomized comparative trial of the Radiation Therapy Oncology Group. Urology. 1995; 45:616-23. http://www.ncbi.nlm.nih.gov/pubmed/7716842?dopt=AbstractPlus
8. Bolla M, Gonzalez D, Warde P et al. Improved survival in patients with locally advanced prostate cancer treated with radiotherapy and goserelin. N Engl J Med. 1997; 337:295-300. http://www.ncbi.nlm.nih.gov/pubmed/9233866?dopt=AbstractPlus
9. Prostate Cancer. From: PDQ. Physician data query (database). Bethesda, MD: National Cancer Institute; 2002 Jul.
10. Pilepich MV, Caplan R, Byhardt RW et al. Phase III trial of androgen suppression using goserelin in unfavorable-prognosis carcinoma of the prostate treated with definitive radiotherapy: report of Radiation Therapy Oncology Group Protocol 85-31. J Clin Oncol. 1997; 15:1013-21. http://www.ncbi.nlm.nih.gov/pubmed/9060541?dopt=AbstractPlus
11. Rock JA, Truglia JA, Caplan RJ et al. Zoladex (goserelin acetate implant) in the treatment of endometriosis: a randomized comparison with danazol. Obstet Gynecol. 1993; 82:198-205. http://www.ncbi.nlm.nih.gov/pubmed/8336864?dopt=AbstractPlus
12. Shaw RW. An open randomized comparative study of the effect of goserelin depot and danazol in the treatment of endometriosis. Fertil Steril. 1992; 58:265-72. http://www.ncbi.nlm.nih.gov/pubmed/1386029?dopt=AbstractPlus
13. Taylor CW, Green S, Dalton WS et al. Multicenter randomized clinical trial of goserelin versus surgical ovariectomy in premenopausal patients with receptor-positive metastatic breast cancer: an intergroup study. J Clin Oncol. 1998; 16:994-9. http://www.ncbi.nlm.nih.gov/pubmed/9508182?dopt=AbstractPlus
14. Bajetta E, Zilembo N, Buzzoni R et al. Goserelin in premenopausal advanced breast cancer: clinical and endocrine evaluation of responsive patients. Oncology. 1994; 51:262-9. http://www.ncbi.nlm.nih.gov/pubmed/8196909?dopt=AbstractPlus
15. Breast Cancer. From: PDQ. Physician data query (database). Bethesda, MD: National Cancer Institute; 2002 Jul.
16. Donnez J, Vilos G, Gannon MJ et al. Goserelin acetate (Zoladex) plus endometrial ablation for dysfunctional uterine bleeding: a large randomized, double-blind study. Fertil Steril. 1997; 68:29- 36. http://www.ncbi.nlm.nih.gov/pubmed/9207580?dopt=AbstractPlus
17. Cersosimo RJ, Carr D. Prostate cancer: current and evolving strategies. Am J Health-Syst Pharm. 1996; 53:381-96. http://www.ncbi.nlm.nih.gov/pubmed/8673658?dopt=AbstractPlus
18. Relative effectiveness and cost-effectiveness of methods of androgen suppression in the treatment of advanced prostatic cancer. Summary, Evidence Report/Technology Assessment (No. 4). Agency for Health Care Policy and Research, Rockville, MD. 1999 Jan. http://www.ahrq.gov/clinic/prossumm.htm
19. American College of Obstetricians and Gynecologists (ACOG) Committee on Practice Bulletins. Medical management of endometriosis. Practice Bulletin No. 11. Washington, DC: American College of Obstetricians and Gynecologists; 1999 Dec.
20. Schering. Eulexin (flutamide) capsules prescribing information. Kenilworth, NJ; 1999 Sept.
21. AstraZeneca, Wilmington, DE: personal communication.
22. Food and Drug Administration. GnRH agonists: safety review of drug class used to treat prostate cancer (sold under the brand names Lupron, Zoladex, Trelstar, Viadur, Vantas, Eligard, Synarel, and generics). Rockville, MD; 2010 May 3. From FDA web site (http://www.fda.gov/Safety/MedWatch/SafetyInformation/SafetyAlertsforHumanMedicalProducts/ucm210576.htm).
23. Food and Drug Administration. GnRH agonists: label change--increased risk of diabetes and cardiovascular disease (update). Rockville, MD; 2010 Oct 20. From FDA web site (http://www.fda.gov/Safety/MedWatch/SafetyInformation/SafetyAlertsforHumanMedicalProducts/ucm230359.htm).
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- Drug class: gonadotropin releasing hormones
Other brands: Zoladex 3-Month