VANDETANIB Drug Interactions: What You Need to Know

INTERACTIONS Avoid the use of strong CYP3A4 inducers because they may decrease CAPRELSA exposure. ( 7.1 ) Avoid the use of agents that prolong the QT interval. ( 5.11 )

7.1 Effect of CYP3A4 Inducers on CAPRELSA Rifampicin, a strong CYP3A4 inducer, decreased vandetanib plasma concentrations. Avoid concomitant use of known strong CYP3A4 inducers during CAPRELSA therapy. Avoid concomitant use of St. John&apos;s wort because it can decrease vandetanib exposure unpredictably <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> .

7.2 Effect of CAPRELSA on OCT2 Transporter CAPRELSA increased plasma concentrations of metformin that is transported by the organic cation transporter type 2 (OCT2). Use caution and closely monitor for toxicities when administering CAPRELSA with drugs that are transported by OCT2 <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> .

7.3 Effect of CAPRELSA on Digoxin CAPRELSA increased plasma concentrations of digoxin. Use caution and closely monitor for toxicities when administering CAPRELSA with digoxin <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> .

7.4 Drugs that Prolong the QT Interval Avoid concomitant use of CAPRELSA with agents that may prolong the QT interval <span class="opacity-50 text-xs">[see Warnings and Precautions (5.11) ]</span> .

Do not use in patients with congenital long QT syndrome [see Boxed Warning ] . Do not use in patients with congenital long QT syndrome. ( 4 )

AND PRECAUTIONS Prolonged QT interval, torsades de pointes, and sudden death: Monitor electrocardiograms and levels of serum potassium, calcium, magnesium and TSH. Reduce CAPRELSA dose as appropriate. ( 2.1 , 5.1 ) Severe skin reactions, including toxic epidermal necrolysis and Stevens-Johnson syndrome, some fatal. Discontinue CAPRELSA for severe skin reactions. ( 2.1 , 5.2 ) Interstitial lung disease (ILD), including fatalities: investigate unexplained non-specific respiratory signs and symptoms. Discontinue CAPRELSA for confirmed ILD. ( 2.1 , 5.3 ) Ischemic cerebrovascular events, hemorrhage, heart failure, diarrhea, hypertension, and reversible posterior leukoencephalopathy syndrome: Discontinue or interrupt CAPRELSA. ( 2.1 , 5.4 , 5.5 , 5.6 , 5.7 , 5.9 , 5.10 ) Impaired wound healing: Withhold for at least 1 month prior to elective surgery. Do not administer CAPRELSA for at least 2 weeks following major surgery and until adequate wound healing. The safety of resumption of treatment with CAPRELSA after resolution of wound healing complications has not been established. ( 5.14 ) Embryo-fetal toxicity: Can cause fetal harm. Advise women of reproductive potential of the potential risk to a fetus and to use effective contraception. ( 5.15 , 8.1 ) Osteonecrosis, including osteonecrosis of the jaw: Withhold CAPRELSA for 1 month prior to scheduled dental surgery and permanently discontinue if osteonecrosis occurs ( 5.16 , 6.2 ).

5.1 QT Prolongation and Torsades de Pointes CAPRELSA can prolong the QT interval in a concentration-dependent manner <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.2) ]</span> . Torsades de pointes, ventricular tachycardia and sudden deaths have occurred in patients treated with CAPRELSA. Do not start CAPRELSA treatment in patients whose QTcF interval is greater than 450 ms. Do not administer CAPRELSA to patients who have a history of Torsades de pointes, congenital long QT syndrome, bradyarrhythmias or uncompensated heart failure. CAPRELSA has not been studied in patients with ventricular arrhythmias or recent myocardial infarction. Vandetanib exposure is increased in patients with impaired renal function. Reduce the starting dose to 200 mg in patients with moderate renal impairment and monitor QT interval frequently. Obtain an ECG and serum potassium, calcium, magnesium and TSH at baseline, 2 to 4 weeks and 8 to 12 weeks after starting treatment with CAPRELSA, and every 3 months thereafter. Monitor electrolytes and ECGs more frequently in patients who experience diarrhea. Following any dose reduction for QT prolongation or any dose interruption greater than 2 weeks, conduct QT assessments as described above. Maintain serum potassium levels of 4 mEq/L or higher (within normal range) and maintain serum magnesium and calcium levels within normal ranges to reduce the risk of QT prolongation. Avoid using CAPRELSA with drugs known to prolong the QT interval <span class="opacity-50 text-xs">[see Warnings and Precautions (5.11) and Drug Interactions (7.4) ]</span> . If such drugs are given to patients already receiving CAPRELSA and no alternative therapy exists, perform ECG monitoring of the QT interval more frequently. Stop CAPRELSA in patients who develop a QTcF greater than 500 ms until the QTcF returns to less than 450 ms. Dosing of CAPRELSA can then be resumed at a reduced dose <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> .

5.2 Severe Skin Reactions Severe and sometimes fatal skin reactions, including toxic epidermal necrolysis (TEN) and Stevens-Johnson syndrome, have occurred in patients treated with CAPRELSA. Permanently discontinue CAPRELSA for severe skin reactions and refer the patient for urgent medical evaluation. Systemic therapies such as corticosteroids may be required. Photosensitivity reactions can occur during CAPRELSA treatment and up to 4 months after treatment discontinuation.

5.3 Interstitial Lung Disease Interstitial Lung Disease (ILD) or pneumonitis, including fatalities, has occurred in patients treated with CAPRELSA. Consider a diagnosis of ILD in patients presenting with non-specific respiratory signs and symptoms. Interrupt CAPRELSA for acute or worsening pulmonary symptoms. Discontinue CAPRELSA if ILD is confirmed.

5.4 Ischemic Cerebrovascular Events Ischemic cerebrovascular events, including fatalities, occurred in patients treated with CAPRELSA. In the randomized medullary thyroid cancer (MTC) study, ischemic cerebrovascular events occurred more frequently with CAPRELSA compared to placebo (1.3% compared to 0%). The safety of resumption of CAPRELSA therapy after resolution of an ischemic cerebrovascular event has not been studied. Discontinue CAPRELSA in patients who experience a severe ischemic cerebrovascular event.

5.5 Hemorrhage Serious hemorrhagic events, including fatalities, occurred in patients treated with CAPRELSA. Do not administer CAPRELSA to patients with a recent history of hemoptysis of ≥1/2 teaspoon of red blood. Discontinue CAPRELSA in patients with severe hemorrhage.

5.6 Heart Failure Heart failure, including fatalities, occurred in patients treated with CAPRELSA. Monitor for signs and symptoms of heart failure. Consider discontinuation of CAPRELSA in patients with heart failure. Heart failure may not be reversible upon stopping CAPRELSA.

5.7 Diarrhea Diarrhea of Grade 3 or greater severity occurred in 11% of patients receiving CAPRELSA in the randomized MTC study. If diarrhea occurs, carefully monitor serum electrolytes and ECGs to reduce the risk and enable early detection of QT prolongation resulting from dehydration <span class="opacity-50 text-xs">[see Warnings and Precautions (5.1) ]</span> . Interrupt CAPRELSA for severe diarrhea. Upon improvement, resume CAPRELSA at a reduced dose <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> .

5.8 Hypothyroidism In the randomized MTC study in which 90% of the patients enrolled had prior thyroidectomy, increased dosing of thyroid replacement therapy was required in 49% of CAPRELSA-treated patients compared to 17% of placebo-treated patients.

Obtain

Thyroid-stimulating hormone (TSH) at baseline, at 2 to 4 weeks and 8 to 12 weeks after starting treatment with CAPRELSA, and every 3 months thereafter. If signs or symptoms of hypothyroidism occur, examine thyroid hormone levels and adjust thyroid replacement therapy accordingly.

5.9 Hypertension Hypertension, including hypertensive crisis, has occurred in patients treated with CAPRELSA. Monitor all patients for hypertension. Dose reduction or interruption for hypertension may be necessary. If hypertension cannot be controlled, do not resume CAPRELSA <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> .

5.10 Reversible Posterior Leukoencephalopathy Syndrome Reversible posterior leukoencephalopathy syndrome (RPLS), a syndrome of subcortical vasogenic edema diagnosed by an MRI of the brain, has occurred in patients treated with CAPRELSA. Consider this syndrome in any patient presenting with seizures, headache, visual disturbances, confusion or altered mental function. In clinical studies, three of four patients who developed RPLS while taking CAPRELSA also had hypertension. Discontinue CAPRELSA treatment in patients with RPLS.

5.11 Drug Interactions Avoid administration of CAPRELSA with anti-arrhythmic drugs (including but not limited to amiodarone, disopyramide, procainamide, sotalol, dofetilide) and other drugs that may prolong the QT interval (including but not limited to chloroquine, clarithromycin, dolasetron, granisetron, haloperidol, methadone, moxifloxacin, and pimozide) <span class="opacity-50 text-xs">[see Drug Interactions (7.4) and Clinical Pharmacology (12.2) ]</span> .

5.12 Renal Failure Renal failure occurred in patients treated with CAPRELSA <span class="opacity-50 text-xs">[see Adverse Reactions (6.1) ]</span>. Withhold, reduce the dose or permanently discontinue based on severity <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> . Vandetanib exposure is increased in patients with impaired renal function. Reduce the starting dose to 200 mg in patients with moderate renal impairment and monitor the QT interval closely <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> . Vandetanib is not recommended for use in patients with severe renal impairment (clearance below 30 mL/min). There is no information available for patients with end-stage renal disease requiring dialysis <span class="opacity-50 text-xs">[see Boxed Warning , Dosage and Administration (2.1) , Use in Specific Populations (8.6) and Clinical Pharmacology (12.3) ]</span> .

5.13 Hepatic Impairment CAPRELSA is not recommended for use in patients with moderate and severe hepatic impairment, as safety and efficacy have not been established <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> .

5.14 Impaired Wound Healing Impaired wound healing can occur in patients who receive drugs that inhibit the VEGF signaling pathway. Impaired wound healing has occurred in patients treated with CAPRELSA. Withhold CAPRELSA for at least 1 month prior to elective surgery. Do not administer CAPRELSA for at least 2 weeks following major surgery and until adequate wound healing. The safety of resumption of treatment with CAPRELSA after resolution of wound healing complications has not been established.

5.15 Embryo-Fetal Toxicity Based on its mechanism of action and findings in animals, CAPRELSA can cause fetal harm when administered to a pregnant woman. In rats, vandetanib was embryotoxic, fetotoxic, and induced fetal malformations at exposures equivalent to or lower than those expected at the 300 mg clinical dose and had adverse effects on female fertility, embryofetal development, and postnatal development of pups. Advise patients of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment with CAPRELSA and for 4 months after the last dose. Advise males with female partners of reproductive potential to use effective contraception during treatment with CAPRELSA and for 4 months after the last dose <span class="opacity-50 text-xs">[see Use in Specific Populations (8.1) , (8.3) ]</span> .

5.16 Osteonecrosis Osteonecrosis, including osteonecrosis of the jaw (ONJ), has occurred during treatment with CAPRELSA. Concomitant exposure to other risk factors, such as bisphosphonates, denosumab, dental disease or invasive dental procedures, may increase the risk of ONJ. Perform an oral examination prior to and periodically during treatment with CAPRELSA. Advise patients regarding good oral hygiene practices. Avoid invasive dental procedures while on CAPRELSA treatment, particularly in patients at higher risk. Withhold CAPRELSA for at least one month prior to scheduled dental surgery or invasive dental procedures. Permanently discontinue CAPRELSA if ONJ develops. <span class="opacity-50 text-xs">[see Adverse Reactions (6.2) ]</span> .