TEMSIROLIMUS Drug Interactions: What You Need to Know

INTERACTIONS Strong inducers of CYP3A4/5 and inhibitors of CYP3A4 may affect concentrations of the primary metabolite of TORISEL. If alternatives cannot be used, dose modifications of TORISEL are recommended. ( 7.1 , 7.2 , 7.3 )

7.1 Agents Inducing CYP3A Metabolism Co-administration of TORISEL with rifampin, a potent CYP3A4/5 inducer, had no significant effect on temsirolimus C max (maximum concentration) and AUC (area under the concentration versus the time curve) after intravenous administration, but decreased sirolimus C max by 65% and AUC by 56% compared to TORISEL treatment alone. If alternative treatment cannot be administered, a dose adjustment should be considered <span class="opacity-50 text-xs">[see Dosage and Administration (2.4) ]</span> .

7.2 Agents Inhibiting CYP3A Metabolism Co-administration of TORISEL with ketoconazole, a potent CYP3A4 inhibitor, had no significant effect on temsirolimus C max or AUC; however, sirolimus AUC increased 3.1-fold, and C max increased 2.2-fold compared to TORISEL alone. If alternative treatment cannot be administered, a dose adjustment should be considered <span class="opacity-50 text-xs">[see Dosage and Administration (2.4) ]</span> .

7.3 Angioedema with ACE inhibitors and Calcium Channel Blockers Angioedema has been reported in patients taking mammalian target of rapamycin (mTOR) inhibitors in combination with ramipril and/or amlodipine. Monitor patients for signs and symptoms of angioedema when temsirolimus is given concomitantly with angiotensin converting enzyme (ACE) inhibitors (e.g., ramipril) or calcium channel blockers (CCB) (e.g., amlodipine).

Drug Interactions

Effect of Temsirolimus on CYP2D6 or CYP3A The concentration of desipramine, a CYP2D6 substrate, was unaffected when 25 mg of temsirolimus was co-administered. No clinically significant effect is anticipated when 25 mg of temsirolimus is co-administered with agents that are metabolized by CYP2D6 or CYP3A.

Temsirolimus injection is contraindicated in patients with bilirubin >1.5 x ULN [ see Warnings and Precautions ( 5.2 )]. Temsirolimus injection is contraindicated in patients with bilirubin >1.5 x ULN. ( 4 )

AND PRECAUTIONS Hypersensitivity/Infusion Reactions (including some life-threatening and rare fatal reactions) can occur early in the first infusion of Temsirolimus injection. Patients should be monitored throughout the infusion. ( 5.1 ) To treat hypersensitivity reactions, stop Temsirolimus injection and treat with an antihistamine. Temsirolimus injection may be restarted at physician discretion at a slower rate. ( 5.1 )

Hepatic

Impairment: Use caution when treating patients with mild hepatic impairment and reduce dose. ( 2.4 , 5.2 ) Hyperglycemia and hyperlipidemia are likely and may require treatment. Monitor glucose and lipid profiles. ( 5.3 , 5.6 ) Infections may result from immunosuppression. ( 5.4 ) Monitor for symptoms or radiographic changes of interstitial lung disease (ILD). If ILD is suspected, discontinue Temsirolimus injection, and consider use of corticosteroids and/or antibiotics. ( 5.5 ) Bowel perforation may occur. Evaluate fever, abdominal pain, bloody stools, and/or acute abdomen promptly. ( 5.7 ) Renal failure, sometimes fatal, has occurred. Monitor renal function at baseline and while on Temsirolimus injection. ( 5.8 ) Due to abnormal wound healing, use Temsirolimus injection with caution in the perioperative period. ( 5.9 ) Proteinuria and nephrotic syndrome may occur. Monitor urine protein prior to the start of Temsirolimus injection therapy and periodically thereafter.

Discontinue

Temsirolimus injection in patients with who develop nephrotic syndrome. ( 5.11 ) Live vaccinations and close contact with those who received live vaccines should be avoided. ( 5.14 ) Embryo-Fetal Toxicity: Can cause fetal harm. Advise patients of the potential hazard to the fetus and to use effective contraception. ( 5.15 , 8.1 , 8.3 ) Elderly patients may be more likely to experience certain adverse reactions, including diarrhea, edema and pneumonia. ( 5.16 )

5.1 Hypersensitivity/Infusion Reactions Hypersensitivity/infusion reactions, including but not limited to flushing, chest pain, dyspnea, hypotension, apnea, loss of consciousness, hypersensitivity and anaphylaxis, have been associated with the administration of temsirolimus. These reactions can occur very early in the first infusion, but may also occur with subsequent infusions. Patients should be monitored throughout the infusion and appropriate supportive care should be available. Temsirolimus infusion should be interrupted in all patients with severe infusion reactions and appropriate medical therapy administered. Temsirolimus injection should be used with caution in persons with known hypersensitivity to temsirolimus or its metabolites (including sirolimus), polysorbate 80, or to any other component (including the excipients) of Temsirolimus injection. An H 1 antihistamine should be administered to patients before the start of the intravenous temsirolimus infusion. Temsirolimus injection should be used with caution in patients with known hypersensitivity to an antihistamine, or patients who cannot receive an antihistamine for other medical reasons. If a patient develops a hypersensitivity reaction during the Temsirolimus injection infusion, the infusion should be stopped and the patient should be observed for at least 30 to 60 minutes (depending on the severity of the reaction). At the discretion of the physician, treatment may be resumed with the administration of an H 1 -receptor antagonist (such as diphenhydramine), if not previously administered <span class="opacity-50 text-xs">[see Dosage and Administration ( 2.2 )]</span> , and/or an H 2 -receptor antagonist (such as intravenous famotidine 20 mg or intravenous ranitidine 50 mg) approximately 30 minutes before restarting the Temsirolimus injection infusion. The infusion may then be resumed at a slower rate (up to 60 minutes). A benefit-risk assessment should be done prior to the continuation of temsirolimus therapy in patients with severe or life-threatening reactions.

5.2 Hepatic Impairment The safety and pharmacokinetics of Temsirolimus injection were evaluated in a dose escalation phase 1 study in 110 patients with normal or varying degrees of hepatic impairment. Patients with baseline bilirubin &gt;1.5×ULN experienced greater toxicity than patients with baseline bilirubin ≤1.5×ULN when treated with Temsirolimus injection. The overall frequency of ≥ grade 3 adverse reactions and deaths, including deaths due to progressive disease, were greater in patients with baseline bilirubin &gt;1.5×ULN due to increased risk of death <span class="opacity-50 text-xs">[see Contraindications ( 4 )]</span> . Use caution when treating patients with mild hepatic impairment. Concentrations of temsirolimus and its metabolite sirolimus were increased in patients with elevated AST or bilirubin levels.

If

Temsirolimus injection must be given in patients with mild hepatic impairment (bilirubin >1 – 1.5×ULN or AST >ULN but bilirubin ≤ULN), reduce the dose of Temsirolimus injection to 15 mg/week [see Dosage and Administration ( 2.4 )].

5.3 Hyperglycemia/Glucose Intolerance The use of Temsirolimus injection is likely to result in increases in serum glucose. In the phase 3 trial, 89% of patients receiving Temsirolimus injection had at least one elevated serum glucose while on treatment, and 26% of patients reported hyperglycemia as an adverse event. This may result in the need for an increase in the dose of, or initiation of, insulin and/or oral hypoglycemic agent therapy. Serum glucose should be tested before and during treatment with Temsirolimus injection. Patients should be advised to report excessive thirst or any increase in the volume or frequency of urination.

5.4 Infections The use of Temsirolimus injection may result in immunosuppression. Patients should be carefully observed for the occurrence of infections, including opportunistic infections <span class="opacity-50 text-xs">[see Adverse Reactions ( 6.1 )]</span>. Pneumocystis jiroveci pneumonia (PJP), including fatalities, has been reported in patients who received temsirolimus. This may be associated with concomitant use of corticosteroids or other immunosuppressive agents. Prophylaxis of PJP should be considered when concomitant use of corticosteroids or other immunosuppressive agents are required.

5.5 Interstitial Lung Disease Cases of interstitial lung disease, some resulting in death, occurred in patients who received Temsirolimus injection. Some patients were asymptomatic, or had minimal symptoms, with infiltrates detected on computed tomography scan or chest radiograph. Others presented with symptoms such as dyspnea, cough, hypoxia, and fever. Some patients required discontinuation of Temsirolimus injection and/or treatment with corticosteroids and/or antibiotics, while some patients continued treatment without additional intervention. Patients should be advised to report promptly any new or worsening respiratory symptoms. It is recommended that patients undergo baseline radiographic assessment by lung computed tomography scan or chest radiograph prior to the initiation of Temsirolimus injection therapy. Follow such assessments periodically, even in the absence of clinical respiratory symptoms. It is recommended that patients be followed closely for occurrence of clinical respiratory symptoms. If clinically significant respiratory symptoms develop, consider withholding Temsirolimus injection administration until after recovery of symptoms and improvement of radiographic findings related to pneumonitis. Empiric treatment with corticosteroids and/or antibiotics may be considered. Opportunistic infections such as PJP should be considered in the differential diagnosis. For patients who require use of corticosteroids, prophylaxis of PJP may be considered.

5.6 Hyperlipidemia The use of Temsirolimus injection is likely to result in increases in serum triglycerides and cholesterol. In the phase 3 trial, 87% of patients receiving Temsirolimus injection had at least one elevated serum cholesterol value and 83% had at least one elevated serum triglyceride value. This may require initiation, or increase in the dose, of lipid-lowering agents. Serum cholesterol and triglycerides should be tested before and during treatment with Temsirolimus injection.

5.7 Bowel Perforation Cases of fatal bowel perforation occurred in patients who received Temsirolimus injection. These patients presented with fever, abdominal pain, metabolic acidosis, bloody stools, diarrhea, and/or acute abdomen. Patients should be advised to report promptly any new or worsening abdominal pain or blood in their stools.

5.8 Renal Failure Cases of rapidly progressive and sometimes fatal acute renal failure not clearly related to disease progression occurred in patients who received Temsirolimus injection. Some of these cases were not responsive to dialysis.

5.9 Wound Healing Complications Use of Temsirolimus injection has been associated with abnormal wound healing. Therefore, caution should be exercised with the use of Temsirolimus injection in the perioperative period.

5.10 Intracerebral Hemorrhage Patients with central nervous system tumors (primary CNS tumor or metastases) and/or receiving anticoagulation therapy may be at an increased risk of developing intracerebral bleeding (including fatal outcomes) while receiving Temsirolimus injection.

5.11 Proteinuria and Nephrotic syndrome Proteinuria (including cases of nephrotic syndrome) has occurred in patients treated with Temsirolimus injection. Monitor urine protein prior to the start of Temsirolimus injection therapy and periodically thereafter.

Discontinue

Temsirolimus injection in patients who develop nephrotic syndrome.

5.12 Co-administration with Inducers or Inhibitors of CYP3A Metabolism Agents Inducing CYP3A Metabolism: Strong inducers of CYP3A4/5 such as dexamethasone, carbamazepine, phenytoin, phenobarbital, rifampin, rifabutin, and rifampacin may decrease exposure of the active metabolite, sirolimus. If alternative treatment cannot be administered, a dose adjustment should be considered. St. John&apos;s Wort may decrease Temsirolimus injection plasma concentrations unpredictably. Patients receiving Temsirolimus injection should not take St. John&apos;s Wort concomitantly <span class="opacity-50 text-xs">[see Dosage and Administration ( 2.4 ) and Drug Interactions ( 7.1 )]</span> .

Agents

Inhibiting CYP3A Metabolism: Strong CYP3A4 inhibitors such as atazanavir, clarithromycin, indinavir, itraconazole, ketoconazole, nefazodone, nelfinavir, ritonavir, saquinavir, and telithromycin may increase blood concentrations of the active metabolite sirolimus. If alternative treatments cannot be administered, a dose adjustment should be considered [see Dosage and Administration ( 2.4 ) and Drug Interactions ( 7.2 )] .

5.13 Concomitant use of Temsirolimus injection with sunitinib The combination of Temsirolimus injection and sunitinib resulted in dose-limiting toxicity. Dose-limiting toxicities (Grade 3/4 erythematous maculopapular rash, and gout/cellulitis requiring hospitalization) were observed in two out of three patients treated in the first cohort of a phase 1 study at doses of Temsirolimus injection 15 mg IV per week and sunitinib 25 mg oral per day (Days 1-28 followed by a 2-week rest).

5.14 Vaccinations The use of live vaccines and close contact with those who have received live vaccines should be avoided during treatment with Temsirolimus injection. Examples of live vaccines are: intranasal influenza, measles, mumps, rubella, oral polio, BCG, yellow fever, varicella, and TY21a typhoid vaccines.

5.15 Embryo-Fetal Toxicity Based on findings in animal studies and its mechanism of action, Temsirolimus injection can cause fetal harm when administered to a pregnant woman. In animal reproduction studies, daily oral administration of temsirolimus to pregnant animals during organogenesis caused adverse embryo-fetal effects in rats and rabbits at approximately 0.04 and 0.12 times the AUC in patients at the recommended human dose, respectively. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment with Temsirolimus injection and for 3 months after the last dose. Advise males with female partners of reproductive potential to use effective contraception during treatment with Temsirolimus injection and for 3 months after the last dose <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.1 ) and Use in Specific Populations ( 8.1 , 8.3 )]</span> .

5.16 Elderly Patients Based on the results of a phase 3 study, elderly patients may be more likely to experience certain adverse reactions including diarrhea, edema, and pneumonia <span class="opacity-50 text-xs">[see Use in Specific Populations ( 8.5 )]</span> .