Abrocitinib: uses, dosing, side effects & brands

The following clinically significant adverse reactions are described elsewhere in the labeling: • Serious Infections [see Warnings and Precautions (5.1) ] • Mortality [see Warnings and Precautions (5.2) ] • Malignancy and Lymphoproliferative Disorders [see Warnings and Precautions (5.3) ] • Major Adverse Cardiovascular Events [see Warnings and Precautions (5.4) ] • Thrombosis [see Warnings and Precautions (5.5) ] • Laboratory Abnormalities [see Warnings and Precautions (5.7) ] Most common adverse events (≥1% with CIBINQO 100 mg) are nasopharyngitis, nausea, headache, herpes simplex, increased blood creatine phosphokinase, dizziness, urinary tract infection, fatigue, acne, vomiting, impetigo, oropharyngeal pain, hypertension, influenza, gastroenteritis, and dermatitis contact. ( 6.1 ) Most common adverse reactions (≥1% with CIBINQO 200 mg and greater than CIBINQO 100 mg) are nausea, headache, herpes simplex, increased blood creatine kinase, dizziness, urinary tract infection, acne, vomiting, gastroenteritis, upper abdominal pain, abdominal discomfort, herpes zoster, and thrombocytopenia. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Pfizer Inc. at 1-800-438-1985 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of…

CIBINQO is contraindicated in patients taking antiplatelet therapies, except for low-dose aspirin (≤81 mg daily), during the first 3 months of treatment [see Warnings and Precautions (5.7) , Drug Interactions (7.2) , and Clinical Pharmacology (12.2) ]. Antiplatelet therapies except for low-dose aspirin (≤81 mg daily), during the first 3 months of treatment. ( 4 )

Strong inhibitors of CYP2C19: The recommended dosage is 50 mg once daily or 100 mg once daily for those patients who are not responding to 50 mg once daily. ( 2.5 , 7.1 ) • Moderate to strong inhibitors of both CYP2C19 and CYP2C9, or strong CYP2C19 or CYP2C9 inducers: Avoid concomitant use. ( 7.1 ) • P-gp substrate where small concentration changes may lead to serious or life-threatening toxicities: Monitor or titrate dosage of P-gp substrate. ( 7.2 ) 7.1 Effects of Other Drugs on CIBINQO Table 4 includes drugs with clinically significant drug interactions affecting CIBINQO. Table 4. Clinically Significant Drug Interactions Affecting CIBINQO Strong CYP2C19 Inhibitors Clinical Impact Coadministration of CIBINQO with strong CYP2C19 inhibitors increases the combined exposure of abrocitinib and its two active metabolites, M1 and M2 which may increase the adverse reactions of CIBINQO [see Clinical Pharmacology (12.3) ]. Intervention Dosage reduction of CIBINQO is recommended when coadministered with strong CYP2C19 inhibitors [see Dosage and Administration (2.5) ]. Moderate to Strong Inhibitors of both CYP2C19 and CYP2C9 Clinical Impact Coadministration of CIBINQO with drugs that are moderate to strong inhibitors of both CYP2C19 and CYP2C9 increases the exposure of abrocitinib and its two active metabolites, M1 and M2 which may increase the adverse reactions of CIBINQO [ Clinical Pharmacology (12.3) ]. Intervention Avoid concomitant use of CIBINQO with drugs that are moderate to strong inhibitors of both CYP2C19 and CYP2C9 . Strong CYP2C19 or CYP2C9 Inducers Clinical Impact Coadministration of CIBINQO with strong CYP2C19 or CYP2C9 inducers decreases the combined exposure of abrocitinib and its two active metabolites, M1 and M2, which may result in loss of or reduced clinical response [see Clinical Pharmacology (12.3) ] . Intervention Avoid concomitant use of CIBINQO with strong CYP2C19 or CYP2C9 inducers. 7.2 Effects of CIBINQO on Other Drugs Table 5 includes clinically significant drug interactions affecting other drugs. Table 5. Clinically Significant Interactions Affecting Other Drugs P-gp Substrate Where Small Concentration Changes May Lead to Serious or Life-threatening Toxicities Clinical Impact Coadministration of CIBINQO with P-gp substrate increases plasma concentrations of P-gp substrates and may result in potential adverse reactions of the P-gp substrate where small concentration changes may lead to serious or life-threatening toxicities (e.g., digoxin) [see Clinical Pharmacology (12.3) ] . Intervention Monitor appropriately or dose titrate P-gp substrate where small concentration changes may lead to serious or life-threatening toxicities when coadministered with CIBINQO . Antiplatelet Therapy Drugs Clinical Impact Coadministration of CIBINQO with antiplatelet therapy drugs may increase the risk of bleeding with thrombocytopenia [see Warnings and Precautions (5.5) and Clinical Pharmacology (12.2) ]. Intervention Antiplatelet drugs, except for low-dose aspirin (≤81 mg daily), during the first 3 months of treatment are contraindicated with CIBINQO [see Contraindications (4) ] .