LEUPROLIDE Drug Interactions: What You Need to Know

Drug Interactions See CLINICAL PHARMACOLOGY , Pharmacokinetics section.

Drug/Laboratory

Test Interactions Administration of leuprolide acetate in therapeutic doses results in suppression of the pituitary-gonadal system. Normal function is usually restored within 4 to 12 weeks after treatment is discontinued. Carcinogenesis, Mutagenesis, Impairment of Fertility Two-year carcinogenicity studies were conducted with leuprolide acetate in rats and mice. In rats, a dose-related increase of benign pituitary hyperplasia and benign pituitary adenomas was noted at 24 months when the drug was administered subcutaneously at high daily doses (0.6 to 4 mg/kg). There was a significant but not dose-related increase of pancreatic islet-cell adenomas in females and of testicular interstitial cell adenomas in males (highest incidence in the low dose group). In mice, no pituitary abnormalities were observed at a dose as high as 60 mg/kg for two years. Patients have been treated with leuprolide acetate for up to three years with doses as high as 10 mg/day and for two years with doses as high as 20 mg/day without demonstrable pituitary abnormalities. Mutagenicity studies have been performed with leuprolide acetate using bacterial and mammalian systems. These studies provided no evidence of a mutagenic potential. Leuprolide injection may reduce male and female fertility. Administration of leuprolide acetate to male and female rats at dose of 0.024, 0.24, and 2.4 mg/kg as monthly depot formulation for up to 3 months (approximately as low as 1/30 of the human dose based on body surface area using an estimated daily dose in animals and humans) caused atrophy of the reproductive organs, and suppression of reproductive function. These changes were reversible upon cessation of treatment.

LUPRON DEPOT 11.25 mg is contraindicated in women with the following: Hypersensitivity to gonadotropin-releasing hormone (GnRH), GnRH agonist analogs, including leuprolide acetate, or any of the excipients in LUPRON DEPOT 11.25 mg [see Warnings and Precautions ( 5.4 ) and Adverse Reactions ( 6.2 ) ] Undiagnosed abnormal uterine bleeding Pregnancy [see Warnings and Precautions ( 5.2 ) and Use in Specific Populations ( 8.1 ) ] When norethindrone acetate is administered with LUPRON DEPOT 11.25 mg, the contraindications to the use of norethindrone acetate also apply to this combination regimen. Refer to the norethindrone acetate prescribing information for a list of contraindications for norethindrone acetate. Hypersensitivity to GnRH, GnRH agonist analogs, including leuprolide acetate, or any of the excipients in LUPRON DEPOT 11.25 mg. ( 4 , 5.4 ) Undiagnosed abnormal uterine bleeding. ( 4 ) Pregnancy. ( 4 , 8.1 ) If LUPRON DEPOT 11.25 mg is administered with norethindrone acetate, the contraindications for norethindrone acetate also apply. ( 4 )

AND PRECAUTIONS Tumor Flare: Transient increase in serum levels of testosterone during treatment may result in worsening of symptoms or onset of new signs and symptoms during the first few weeks of treatment, including bone pain, neuropathy, hematuria, bladder outlet obstruction, ureteral obstruction, or spinal cord compression. Monitor patients at risk closely and manage as appropriate. ( 5.1 , 5.7 ) Hyperglycemia and diabetes: Hyperglycemia and an increased risk of developing diabetes have been reported in men receiving GnRH analogs. Monitor blood glucose level and manage according to current clinical practice. ( 5.2 ) Cardiovascular diseases: Increased risk of myocardial infarction, sudden cardiac death and stroke has been reported in men. Monitor for cardiovascular disease and manage according to current clinical practice. ( 5.3 ) Effect on QT/QTc Interval: Androgen deprivation therapy may prolong the QT interval. Consider risks and benefits. ( 5.4 ) Convulsions have been observed in patients with or without a history of predisposing factors. Manage convulsions according to the current clinical practice. (5.5)

Severe Cutaneous Adverse

Reactions (SCARs), including Stevens-Johnson syndrome/toxic epidermal necrolysis, occurred in patients treated with VABRINTY. Interrupt VABRINTY if signs or symptoms of SCARs develop. Permanently discontinue if SCARs are confirmed. ( 5.6 ) Embryo-Fetal Toxicity: May cause fetal harm. ( 5.8 , 8.1 )

5.1 Tumor Flare VABRINTY 7.5 mg, 22.5 mg, and 30 mg like other GnRH agonists, causes a transient increase in serum concentrations of testosterone during the first week of treatment. VABRINTY 45 mg causes a transient increase in serum concentrations of testosterone during the first two weeks of treatment. Patients may experience worsening of symptoms or onset of new signs and symptoms during the first few weeks of treatment, including bone pain, neuropathy, hematuria, or bladder outlet obstruction. Cases of ureteral obstruction and/or spinal cord compression, which may contribute to paralysis with or without fatal complications, have been observed in the treatment of advanced prostate cancer using GnRH agonists. Patients with metastatic vertebral lesions and/or with urinary tract obstruction should be closely observed during the first few weeks of therapy. If spinal cord compression or ureteral obstruction develops, standard treatment of these complications should be instituted.

5.2 Hyperglycemia and Diabetes Hyperglycemia and an increased risk of developing diabetes have been reported in men receiving GnRH agonists. Hyperglycemia may represent development of diabetes mellitus or worsening of glycemic control in patients with diabetes. Monitor blood glucose and/or glycosylated hemoglobin (HbA1c) periodically in patients receiving a GnRH agonist and manage with current practice for treatment of hyperglycemia or diabetes.

5.3 Cardiovascular Diseases Increased risk of developing myocardial infarction, sudden cardiac death and stroke has been reported in association with use of GnRH agonists in men. The risk appears low based on the reported odds ratios, and should be evaluated carefully along with cardiovascular risk factors when determining a treatment for patients with prostate cancer. Patients receiving a GnRH agonist should be monitored for symptoms and signs suggestive of development of cardiovascular disease and be managed according to current clinical practice.

5.4 Effect on QT/QTc Interval Androgen deprivation therapy may prolong the QT/QTc interval. Providers should consider whether the benefits of androgen deprivation therapy outweigh the potential risks in patients with congenital long QT syndrome, congestive heart failure, frequent electrolyte abnormalities, and in patients taking drugs known to prolong the QT interval. Electrolyte abnormalities should be corrected. Consider periodic monitoring of electrocardiograms and electrolytes.

5.5 Convulsions Postmarketing reports of convulsions have been observed in patients on leuprolide acetate therapy. These included patients with a history of seizures, epilepsy, cerebrovascular disorders, central nervous system anomalies or tumors, and in patients on concomitant medications that have been associated with convulsions such as bupropion and SSRIs. Convulsions have also been reported in patients in the absence of any of the conditions mentioned above. Patients receiving a GnRH agonist who experience convulsion should be managed according to current clinical practice.

5.6 Severe Cutaneous Adverse Reactions Severe cutaneous adverse reactions (SCARs), including Steve-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN), and erythema multiforme, occurred in patients receiving VABRINTY <span class="opacity-50 text-xs">[see Adverse Reactions ( 6.2 )]</span> . Monitor patients for the development of SCARs. Advise patients of the signs and symptoms of SCARs (e.g., a prodrome of fever, flu-like symptoms, mucosal lesions, progressive skin rash, or lymphadenopathy). If a SCAR is suspected, interrupt VABRINTY until the etiology of the reaction has been determined. Consultation with a dermatologist is recommended. If a SCAR is confirmed, or for other grade 4 skin reactions, permanently discontinue VABRINTY.

5.7 Laboratory Tests Monitor VABRINTY response by periodic measurement of serum concentrations of testosterone and prostate specific antigen. In the majority of patients, testosterone levels increased above Baseline during the first week, declining thereafter to Baseline levels or below by the end of the second or third week. Castrate levels were generally reached within two to four weeks. Castrate testosterone levels were maintained for the duration of the treatment with VABRINTY 7.5 mg. No increases to above the castrate level occurred in any of the patients. Castrate levels were generally maintained for the duration of treatment with VABRINTY 22.5 mg. Once castrate levels were achieved with VABRINTY 30 mg, most (86/89) patients remained suppressed throughout the study. Once castrate levels were achieved with VABRINTY 45 mg, one patient (&lt; 1%) experienced a breakthrough, with testosterone levels &gt; 50 ng/dL. Results of testosterone determinations are dependent on assay methodology. It is advisable to be aware of the type and precision of the assay methodology to make appropriate clinical and therapeutic decisions.

Drug/Laboratory

Test Interactions: Therapy with VABRINTY results in suppression of the pituitary-gonadal system. Results of diagnostic tests of pituitary gonadotropic and gonadal functions conducted during and after VABRINTY therapy may be affected.

5.8 Embryo-Fetal Toxicity Based on findings in animal studies and mechanism of action, VABRINTY may cause fetal harm when administered to a pregnant woman. In animal developmental and reproductive studies, major fetal abnormalities were observed after administration of leuprolide acetate throughout gestation in rats. Advise pregnant patients and females of reproductive potential of the potential risk to the fetus <span class="opacity-50 text-xs">[see Use in Specific Populations (8.1), Clinical Pharmacology ( 12.1 )]</span> .