Tibsovo Dosage

Generic name: ivosidenib 250mg
Dosage form: tablet, film coated
Drug class: Miscellaneous antineoplastics

Medically reviewed by Drugs.com. Last updated on Oct 30, 2023.

Patient Selection

Select patients for treatment with TIBSOVO based on the presence of IDH1 mutations [see Clinical Studies (14.1, 14.2, 14.3, 14.4)].

Information on FDA-approved tests for the detection of IDH1 mutations in AML, MDS, and cholangiocarcinoma is available at http://www.fda.gov/CompanionDiagnostics.

Recommended Dosage

The recommended dosage of TIBSOVO is 500 mg taken orally once daily until disease progression or unacceptable toxicity [see Clinical Studies (14.1, 14.2, 14.3, 14.4)].

For patients with AML or MDS without disease progression or unacceptable toxicity, continue TIBSOVO for a minimum of 6 months to allow time for clinical response.

Administer TIBSOVO with or without food.
Do not administer TIBSOVO with a high-fat meal [see Warnings and Precautions (5.2) and Clinical Pharmacology (12.3)].
Do not split, crush, or chew TIBSOVO tablets.
Administer TIBSOVO tablets orally about the same time each day.
If a dose of TIBSOVO is vomited, do not administer a replacement dose; wait until the next scheduled dose is due.
If a dose of TIBSOVO is missed or not taken at the usual time, administer the dose as soon as possible and at least 12 hours prior to the next scheduled dose. Return to the normal schedule the following day. Do not administer 2 doses within 12 hours.

Newly Diagnosed AML (Combination Regimen)

Start TIBSOVO administration on Cycle 1 Day 1 in combination with azacitidine 75 mg/m2 subcutaneously or intravenously once daily on Days 1-7 (or Days 1-5 and 8-9) of each 28-day cycle [see Clinical Studies (14.1)]. Refer to the Prescribing Information for azacitidine for additional dosing information.

Monitoring and Dosage Modifications for Toxicities

Obtain an electrocardiogram (ECG) prior to treatment initiation. Monitor ECGs at least once weekly for the first 3 weeks of therapy and then at least once monthly for the duration of therapy [see Warnings and Precautions (5.2)]. Manage any abnormalities promptly.

Interrupt dosing or reduce dose for toxicities. See Table 1 for dosage modification guidelines.

Table 1: Recommended Dosage Modifications for TIBSOVO
Adverse Reactions	Recommended Action
* Grade 1 is mild, Grade 2 is moderate, Grade 3 is severe, Grade 4 is life-threatening; grading based on Common Terminology Criteria for Adverse Events (CTCAE) version 4.03.
Differentiation syndrome [see Warnings and Precautions (5.1)]	If differentiation syndrome is suspected, administer systemic corticosteroids and initiate hemodynamic monitoring until symptom resolution and for a minimum of 3 days. Interrupt TIBSOVO if severe signs and/or symptoms persist for more than 48 hours after initiation of systemic corticosteroids. Resume TIBSOVO when signs and symptoms improve to Grade 2* or lower.
Noninfectious leukocytosis (white blood cell [WBC] count greater than 25 × 109/L or an absolute increase in total WBC of greater than 15 × 109/L from baseline)	Initiate treatment with hydroxyurea, as per standard institutional practices, and leukapheresis if clinically indicated. Taper hydroxyurea only after leukocytosis improves or resolves. Interrupt TIBSOVO if leukocytosis is not improved with hydroxyurea, and then resume TIBSOVO at 500 mg daily when leukocytosis has resolved.
QTc interval greater than 480 msec to 500 msec [see Warnings and Precautions (5.2) and Drug Interactions (7.1)]	Monitor and supplement electrolyte levels as clinically indicated. Review and adjust concomitant medications with known QTc interval-prolonging effects. Interrupt TIBSOVO. Restart TIBSOVO at 500 mg once daily after the QTc interval returns to less than or equal to 480 msec. Monitor ECGs at least weekly for 2 weeks following resolution of QTc prolongation.
QTc interval greater than 500 msec [see Warnings and Precautions (5.2) and Drug Interactions (7.1)]	Monitor and supplement electrolyte levels as clinically indicated. Review and adjust concomitant medications with known QTc interval-prolonging effects. Interrupt TIBSOVO. Resume TIBSOVO at a reduced dose of 250 mg once daily when QTc interval returns to within 30 msec of baseline or less than or equal to 480 msec. Monitor ECGs at least weekly for 2 weeks following resolution of QTc prolongation. Consider re-escalating the dose of TIBSOVO to 500 mg daily if an alternative etiology for QTc prolongation can be identified.
QTc interval prolongation with signs/symptoms of life-threatening arrhythmia [see Warnings and Precautions (5.2)]	Discontinue TIBSOVO permanently.
Guillain-Barré syndrome [see Warnings and Precautions (5.3)]	Discontinue TIBSOVO permanently.
Other Grade 3* adverse reactions	As monotherapy in AML and MDS: Interrupt TIBSOVO until toxicity resolves to Grade 2* or lower. Resume TIBSOVO at 250 mg once daily; may increase to 500 mg once daily if toxicities resolve to Grade 1* or lower. If Grade 3* or higher toxicity recurs, discontinue TIBSOVO. In cholangiocarcinoma, or in AML in combination with azacitidine: Interrupt TIBSOVO until toxicity resolves to Grade 1* or lower, or baseline, then resume at 500 mg daily (Grade 3 toxicity) or 250 mg daily (Grade 4 toxicity). If Grade 3 toxicity recurs (a second time), reduce TIBSOVO dose to 250 mg daily until the toxicity resolves, then resume 500 mg daily. If Grade 3 toxicity recurs (a third time), or Grade 4 toxicity recurs, discontinue TIBSOVO.

Patients with AML or MDS

Assess blood counts and blood chemistries prior to the initiation of TIBSOVO, at least once weekly for the first month, once every other week for the second month, and once monthly for the duration of therapy.

Monitor blood creatine phosphokinase weekly for the first month of therapy.

Dosage Modification for Use with Strong CYP3A4 Inhibitors

If a strong CYP3A4 inhibitor must be coadministered, reduce the TIBSOVO dose to 250 mg once daily. If the strong inhibitor is discontinued, increase the TIBSOVO dose (after at least 5 half-lives of the strong CYP3A4 inhibitor) to the recommended dose of 500 mg once daily.