Symdeko Dosage

Generic name: Tezacaftor 100mg, Ivacaftor 150mg; Ivacaftor 150mg
Dosage form: kit
Drug class: CFTR combinations

Medically reviewed by Drugs.com. Last updated on Feb 13, 2025.

General Dosage Information

Swallow the tablets whole.

SYMDEKO should be taken with fat-containing food, such as food recommended in standard nutritional guidelines. Examples of meals or snacks that contain fat are those prepared with butter or oils or those containing eggs, cheeses, nuts, whole milk, or meats, etc..

Recommended Dosage in Adults, Adolescents, and Children Aged 6 Years and Older

Adults, adolescents, and children aged 6 years and older should be dosed according to Table 1. The morning and the evening doses should be taken approximately 12 hours apart.

Table 1: Recommended Dosage for Patients Aged 6 Years and Older
Age	Morning (one tablet)	Evening (one tablet)
6 to <12 years weighing <30 kg	tezacaftor 50 mg/ivacaftor 75 mg	ivacaftor 75 mg
6 to <12 years weighing ≥30 kg	tezacaftor 100 mg/ivacaftor 150 mg	ivacaftor 150 mg
≥12 years	tezacaftor 100 mg/ivacaftor 150 mg	ivacaftor 150 mg

Information for Missed Doses:

If 6 hours or less have passed since the missed morning or evening dose, the patient should take the missed dose as soon as possible and continue on the original schedule. If more than 6 hours have passed since the missed morning or evening dose, the patient should not take the missed dose. The next scheduled dose can be taken at the usual time. More than one dose should not be taken at the same time.

Recommended Dosage for Patients with Hepatic Impairment

For dosage adjustment for patients with hepatic impairment, refer to Table 2.

Studies have not been conducted in patients with severe hepatic impairment (Child-Pugh Class C), but exposure of tezacaftor and ivacaftor is expected to be higher than in patients with moderate hepatic impairment. Therefore, SYMDEKO should be used with caution at an adjusted dosage after weighing the risks and benefits of treatment in these patients.

Table 2: Recommended Dosage for Patients with Hepatic Impairment
Hepatic Impairment	Morning		Evening
Hepatic Impairment	Patients Aged 6 to <12 Years Weighing <30 kg	Patients Aged 6 to <12 Years Weighing ≥30 kg and Patients Age ≥12 Years	All Patients
Mild (Child-Pugh Class A)	No dose adjustment	No dose adjustment	No dose adjustment
Moderate (Child-Pugh Class B)	One tablet of tezacaftor 50 mg/ivacaftor 75 mg once daily	One tablet of tezacaftor 100 mg/ivacaftor 150 mg once daily	No ivacaftor dose
Severe (Child-Pugh Class C)	One tablet of tezacaftor 50 mg/ivacaftor 75 mg once daily (or less frequently)	One tablet of tezacaftor 100 mg/ivacaftor 150 mg once daily (or less frequently)	No ivacaftor dose

Dosage Adjustment for Patients Taking Drugs that are CYP3A Inhibitors

The dosing regimen of SYMDEKO should be adjusted when co-administered with moderate and strong CYP3A inhibitors.

Moderate CYP3A inhibitors:

When co-administered with moderate CYP3A inhibitors (e.g., fluconazole, erythromycin), the dosing regimen should be adjusted as in Table 3.

Table 3: Dosing Schedule for Concomitant Use of SYMDEKO with Moderate CYP3A Inhibitors
	Day 1	Day 2	Day 3	Day 4*
* Continue dosing with tezacaftor/ivacaftor or ivacaftor tablets on alternate days.
Patients Aged 6 to <12 Years Weighing <30 kg
Morning
Tezacaftor 50 mg/ivacaftor 75 mg tablet	✓	-	✓	-
Ivacaftor 75 mg tablet	-	✓	-	✓
Evening
Ivacaftor 75 mg tablet	-	-	-	-
Patients Aged 6 to <12 Years Weighing ≥30 kg and Patients Age ≥12 Years
Morning
Tezacaftor 100 mg/ivacaftor 150 mg tablet	✓	-	✓	-
Ivacaftor 150 mg tablet	-	✓	-	✓
Evening
Ivacaftor 150 mg tablet	-	-	-	-

Strong CYP3A inhibitors:

When co-administered with strong CYP3A inhibitors (e.g., ketoconazole, itraconazole, posaconazole, voriconazole, telithromycin, and clarithromycin), the dosing regimen should be adjusted as in Table 4.

Table 4: Dosing Schedule for Concomitant Use of SYMDEKO with Strong CYP3A Inhibitors
	Day 1	Day 2 and Day 3	Day 4*
* Continue dosing with tezacaftor/ivacaftor tablets twice a week, taken approximately 3 to 4 days apart. † The evening dose of ivacaftor should not be taken on any day.
Patients Aged 6 to <12 Years Weighing <30 kg
Morning
Tezacaftor 50 mg/ivacaftor 75 mg tablet	✓	-	✓
Evening†
Ivacaftor 75 mg tablet	-	-	-
Patients Aged 6 to <12 Years Weighing ≥30 kg and Patients Age ≥12 Years
Morning
Tezacaftor 100 mg/ivacaftor 150 mg tablet	✓	-	✓
Evening†
Ivacaftor 150 mg tablet	-	-	-