Interactions between Pomalyst and Zydelig

The pomalidomide in Pomalyst has a moderate potential interaction with Bone Marrow Depression/Low Blood Counts.

The use of pomalidomide has been associated with hematological toxicities, followed by anemia and thrombocytopenia. It is recommended to monitor patients for hematologic toxicities, especially neutropenia. Monitor complete blood counts weekly for the first 8 weeks and monthly thereafter and depending on findings, patients may require dose interruption and/or modification. Close monitoring is recommended.

The idelalisib in Zydelig has a moderate potential interaction with Bone Marrow Depression/Low Blood Counts.

Cases of neutropenia have been reported with the use of idelalisib. It is recommended to monitor blood counts at least every 2 weeks for the first 6 months of therapy, and periodically thereafter. Care and close monitoring is recommended.

The idelalisib in Zydelig has a major potential interaction with Dermatitis, Drug-Induced.

Fatal cases of severe cutaneous reactions, including Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) have occurred in patients treated with idelalisib. It is recommended that if SJS or TEN is suspected to interrupt therapy until the etiology of the reaction has been determined, and if SJS or TEN is confirmed to permanently discontinue treatment with idelalisib. Monitor patients for the development of severe cutaneous reactions and discontinue idelalisib if clinically appropriate.

The idelalisib in Zydelig has a major potential interaction with Diarrhea.

Severe diarrhea or colitis have been reported in patients treated with idelalisib. It is recommended to avoid concurrent use of idelalisib and other drugs that cause diarrhea. Care should be taken when using this agent in patients with diarrhea or colitis.

The idelalisib in Zydelig has a moderate potential interaction with Gastrointestinal Perforation.

Fatal and serious intestinal perforations have been reported in patients treated with idelalisib, some patients reporting moderate to severe diarrhea at the time of perforation. Advise patients to promptly report any new or worsening abdominal pain, chills, fever, nausea, or vomiting. Discontinue therapy with idelalisib permanently in patients who experience intestinal perforation.

The pomalidomide in Pomalyst has a moderate potential interaction with Hemodialysis.

Pomalidomide pharmacokinetic parameters were not significantly affected in patients with moderate or severe renal impairment. Pomalidomide should be used with caution in patients with severe renal impairment requiring dialysis and it should be administered after the completion of hemodialysis on dialysis days as the exposure of the drug could be significantly increased. Dose modification, 25% dose reduction (3 mg daily) is recommended at the start of therapy in patients with severe renal impairment requiring dialysis. Close monitoring is recommended.

The pomalidomide in Pomalyst has a major potential interaction with History, Thrombotic/Thromboembolic Disorder.

Pomalidomide may cause venous thromboembolic events (deep venous thrombosis and pulmonary embolism) and arterial thromboembolic events (myocardial infarction and stroke). It is recommended to initiate precautionary actions to try to minimize all modifiable factors (e.g., hyperlipidemia, hypertension, smoking) in patients with known risk factors, including those with prior thrombosis. Thromboprophylaxis is recommended, and the choice of regimen should be based on the assessment of the patient's underlying risk factors.

The idelalisib in Zydelig has a moderate potential interaction with Infection.

Fatal and/or serious infections, including pneumonia, sepsis, febrile neutropenia, Pneumocystis jirovecii pneumonia (PJP) or cytomegalovirus (CMV) have been reported in patients treated with idelalisib. It is recommended to monitor patients for signs and symptoms of infection and to interrupt therapy with idelalisib for Grade 3 or higher infection. Consider prophylaxis for PJP in patients at risk and interrupt therapy in patients with suspected PJP infection of any grade, and permanently discontinue treatment if PJP infection of any grade is confirmed or interrupt idelalisib in the setting of positive CMV PCR or antigen test until the infection has resolved. If therapy is subsequently resumed, patients should be monitored (by PCR or antigen test) for CMV reactivation at least monthly.

The idelalisib in Zydelig has a moderate potential interaction with Interstitial Lung Disease.

The use of certain multikinase inhibitors has been associated with pulmonary toxicity. Serious cases of interstitial lung disease (ILD), including fatal cases and interstitial pneumonitis or pulmonary fibrosis have been reported. Caution is recommended when using these agents in patients with a history of interstitial pneumonitis or pulmonary fibrosis or those patients presenting with acute onset of new or progressive unexplained pulmonary symptoms such as dyspnea, cough, and fever pending diagnostic evaluation. If ILD is confirmed, these agents should be permanently discontinued and appropriate measures should be instituted. Treatment should be immediately withheld in patients diagnosed with ILD/pneumonitis and permanently discontinued if no other potential causes of ILD/pneumonitis have been identified.

The idelalisib in Zydelig has a major potential interaction with Liver Disease.

Fatal and/or serious hepatotoxicity have been reported in patients treated with idelalisib. Monitor ALT and AST in all patients as clinically appropriate. Patients with baseline hepatic impairment should be monitored for signs of idelalisib toxicity and dose modification with idelalisib should be made accordingly. It is recommended to monitor weekly for liver toxicity if the ALT or AST rises above 3 times the upper limit of normal until resolved and withhold therapy with idelalisib if the ALT or AST is greater than 5 times the upper limit of normal, and continue to monitor AST, ALT and total bilirubin weekly until the normal levels are attained. Discontinue idelalisib for recurrent hepatotoxicity and to avoid concurrent use with other drugs that may cause liver toxicity.

The pomalidomide in Pomalyst has a moderate potential interaction with Liver Disease.

Pomalidomide is primarily metabolized in the liver by CYP450 1A2 and CYP450 3A4. Hepatic failure, including fatal cases, has occurred in patients treated with pomalidomide. Elevated levels of alanine aminotransferase and bilirubin have also been observed. Reduce the starting dose of pomalidomide by 25% (3 mg daily) in patients with mild to moderate hepatic impairment and by 50% (2 mg daily) in those patients with severe hepatic impairment. It is recommended to monitor liver function tests monthly and to stop treatment with pomalidomide upon elevation of liver enzymes. After return to baseline values, treatment at a lower dose may be considered.

The idelalisib in Zydelig has a major potential interaction with Noninfectious Colitis.

Severe diarrhea or colitis have been reported in patients treated with idelalisib. It is recommended to avoid concurrent use of idelalisib and other drugs that cause diarrhea. Care should be taken when using this agent in patients with diarrhea or colitis.

The pomalidomide in Pomalyst has a moderate potential interaction with Peripheral Neuropathy.

The use of pomalidomide has been associated with the development of neuropathy. Therapy with pomalidomide should be administered cautiously in patients with or at risk for neuropathy. Monitor closely for signs and symptoms associated with neuropathy and evaluate patients accordingly.

The idelalisib in Zydelig has a moderate potential interaction with Pulmonary Impairment.

The use of certain multikinase inhibitors has been associated with pulmonary toxicity. Serious cases of interstitial lung disease (ILD), including fatal cases and interstitial pneumonitis or pulmonary fibrosis have been reported. Caution is recommended when using these agents in patients with a history of interstitial pneumonitis or pulmonary fibrosis or those patients presenting with acute onset of new or progressive unexplained pulmonary symptoms such as dyspnea, cough, and fever pending diagnostic evaluation. If ILD is confirmed, these agents should be permanently discontinued and appropriate measures should be instituted. Treatment should be immediately withheld in patients diagnosed with ILD/pneumonitis and permanently discontinued if no other potential causes of ILD/pneumonitis have been identified.

The pomalidomide in Pomalyst has a moderate potential interaction with Smoking.

Cigarette smoking reduces pomalidomide AUC by 32% due to CYP450 1A2 induction. Advise patients that smoking may reduce the efficacy of pomalidomide.

The pomalidomide in Pomalyst has a major potential interaction with Thrombotic/Thromboembolic Disorder.

Pomalidomide may cause venous thromboembolic events (deep venous thrombosis and pulmonary embolism) and arterial thromboembolic events (myocardial infarction and stroke). It is recommended to initiate precautionary actions to try to minimize all modifiable factors (e.g., hyperlipidemia, hypertension, smoking) in patients with known risk factors, including those with prior thrombosis. Thromboprophylaxis is recommended, and the choice of regimen should be based on the assessment of the patient's underlying risk factors.

The pomalidomide in Pomalyst has a moderate potential interaction with Tumor Lysis Syndrome.

Tumor lysis syndrome (TLS) may occur in patients receiving pomalidomide. Patients with high tumor burden and those with high circulating lymphocyte counts of greater than 25 X 10^9/L have a higher risk of developing TLS. Monitor for signs and symptoms of TLS. Temporary interruption or discontinuation of therapy might be required.