Overview
11 DESCRIPTION FABHALTA contains iptacopan, a complement Factor B inhibitor. The molecular weight of iptacopan hydrochloride monohydrate is approximately 477 g/mol. The chemical name is (2 S ,4 S )-2-(4-Carboxyphenyl)-4-ethoxy-1-[(5-methoxy-7-methyl-1 H -indol-4-yl)methyl]piperidin-1-ium chloride―water (1/1). The molecular formula is C 25 H 30 N 2 O 4 ·HCl H 2 O. The structure is shown below.
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Iptacopan binds to Factor B of the alternative complement pathway and regulates the cleavage of C3, generation of downstream effectors, and the amplification of the terminal pathway. In PNH, intravascular hemolysis (IVH) is mediated by the downstream membrane attack complex (MAC), while extravascular hemolysis (EVH) is facilitated by C3b opsonization. Iptacopan acts proximally in the alternative pathway of the complement cascade to control both C3b-mediated EVH and terminal complement-mediated IVH. In IgAN, the deposition of galactose deficient IgA1 (Gd-IgA1) containing immune complexes in the kidney locally activates the alternative complement pathway which is thought to contribute to the pathogenesis of IgAN.
Indications
- 1 INDICATIONS AND USAGE FABHALTA is a complement factor B inhibitor, indicated for: the treatment of adults with paroxysmal nocturnal hemoglobinuria (PNH). ( 1.1 ) the reduction of proteinuria in adults with primary immunoglobulin A nephropathy (IgAN) at risk of rapid disease progression, generally a urine protein-to-creatinine ratio (UPCR) ≥ 1.5 g/g. ( 1.2 ) This indication is approved under accelerated approval based on reduction of proteinuria. It has not been established whether FABHALTA slows kidney function decline in patients with IgAN.
Common Doses
- 200 mg
Dosage
2 DOSAGE AND ADMINISTRATION 200 mg orally twice daily with or without food. ( 2.2 ) 2.1 Recommended Vaccination and Prophylaxis for Encapsulated Bacterial Infections Vaccinate patients against encapsulated bacteria, including Streptococcus pneumoniae and Neisseria meningitidis (serogroups A, C, W, Y and B) , according to current ACIP recommendations at least 2 weeks prior to initiation of FABHALTA [see Warnings and Precautions (5.1)] .
Black Box Warning
WARNING: SERIOUS INFECTIONS CAUSED BY ENCAPSULATED BACTERIA FABHALTA, a complement inhibitor, increases the risk of serious infections, especially those caused by encapsulated bacteria, such as Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae type b [see Warnings and Precautions (5.1)] . Life-threatening and fatal infections with encapsulated bacteria have occurred in patients treated with complement inhibitors. These infections may become rapidly life-threatening or fatal if not recognized and treated early.
Contraindications
- 4 CONTRAINDICATIONS FABHALTA is contraindicated: in patients with serious hypersensitivity to iptacopan or any of the excipients. for initiation in patients with unresolved serious infection caused by encapsulated bacteria, including Streptococcus pneumoniae, Neisseria meningitidis, or Haemophilus influenzae type b. Serious hypersensitivity to iptacopan or any of the excipients. ( 4 ) Initiation in patients with unresolved serious infection caused by encapsulated bacteria. ( 4 )
Side Effects
- 6 ADVERSE REACTIONS The following clinically significant adverse reactions are discussed in greater detail in other sections of the labeling: Serious Infections Caused by Encapsulated Bacteria [see Warnings and Precautions (5.1)] . Hyperlipidemia [see Warnings and Precautions (5.4)] . Most common adverse reactions in adults with PNH (incidence ≥ 10%) were headache, nasopharyngitis, diarrhea, abdominal pain, bacterial infection, viral infection, nausea and rash. ( 6.
Interactions
- 7 DRUG INTERACTIONS CYP2C8 inducers (e.g., rifampin): May decrease iptacopan exposure. Monitor for loss of efficacy. ( 7.1 ) Strong CYP2C8 inhibitors (e.g., gemfibrozil): May increase iptacopan exposure. Coadministration not recommended. ( 7.2 ) 7.1 CYP2C8 Inducers Concomitant use of CYP2C8 inducers (e.g., rifampin) may decrease iptacopan exposure, which may result in loss of or reduced efficacy of FABHALTA. Monitor the clinical response and discontinue use of the CYP2C8 inducer if loss of efficacy of FABHALTA is evident. 7.