Prezista Dosage

Generic name: darunavir
Dosage form: tablet, film coated; oral suspension

The information at Drugs.com is not a substitute for medical advice. ALWAYS consult your doctor or pharmacist.

Adult Patients

PREZISTA must be co-administered with ritonavir to exert its therapeutic effect. Failure to correctly co-administer PREZISTA with ritonavir will result in plasma levels of darunavir that will be insufficient to achieve the desired antiviral effect and will alter some drug interactions.

Patients who have difficulty swallowing PREZISTA tablets can use the 100 mg/mL PREZISTA oral suspension.

Treatment-Naïve Adult Patients

The recommended oral dose of PREZISTA is 800 mg (one 800 mg tablet or 8 mL of the oral suspension) taken with ritonavir 100 mg (one 100 mg tablet/capsule or 1.25 mL of a 80 mg/mL ritonavir oral solution) once daily and with food. An 8 mL darunavir dose should be taken as two 4 mL administrations with the included oral dosing syringe.

Treatment-Experienced Adult Patients

Table 1: Treatment-Experienced Adult Patients
*
V11I, V32I, L33F, I47V, I50V, I54L, I54M, T74P, L76V, I84V and L89V
An 8 mL darunavir dose should be taken as two 4 mL administrations with the included oral dosing syringe
With no darunavir resistance associated substitutions* With at least one darunavir resistance associated substitution*
Formulations: PREZISTA tablets or oral suspension (100 mg/mL) and ritonavir tablets/capsules (100 mg) or solution (80 mg/mL)
PREZISTA 800 mg (one 800 mg tablet) or 8 mL(oral suspension) once daily with ritonavir 100 mg (one 100 mg tablet/capsule or 1.25 mL (oral solution) once daily and with food PREZISTA 600 mg (e.g. one 600 mg tablet) or 6 mL (oral suspension) twice daily with ritonavir 100 mg (one 100 mg tablet/capsule or 1.25 mL (oral solution) twice daily and with food

For antiretroviral treatment-experienced patients genotypic testing is recommended. However, when genotypic testing is not feasible, PREZISTA/ritonavir 600/100 mg twice daily dosing is recommended.

Pediatric Patients (age 3 to less than 18 years)

Healthcare professionals should pay special attention to accurate dose selection of PREZISTA, transcription of the medication order, dispensing information and dosing instruction to minimize risk for medication errors, overdose, and underdose.

Prescribers should select the appropriate dose of PREZISTA/ritonavir for each individual child based on body weight (kg) and should not exceed the recommended dose for adults.

Before prescribing PREZISTA, children weighing greater than or equal to 15 kg should be assessed for the ability to swallow tablets. If a child is unable to reliably swallow a tablet, the use of PREZISTA oral suspension should be considered.

The recommended dose of PREZISTA/ritonavir for pediatric patients (3 to less than 18 years of age and weighing at least 10 kg is based on body weight (see Tables 2, 3, 4, and 5) and should not exceed the recommended adult dose. PREZISTA should be taken with ritonavir and with food.

The recommendations for the PREZISTA/ritonavir dosage regimens were based on the following:

Twice daily dosing

  • Results from two trials in treatment-experienced pediatric subjects 3 to less 18 years of age demonstrating similar darunavir plasma exposures, virologic response rate and safety profile compared to treatment-experienced adults.

Once daily dosing

  • Results from one trial in treatment-naive pediatric subjects 12 to less than 18 years of age demonstrating similar darunavir plasma exposures, virologic response rate and safety profile compared to treatment-naive adults.
  • Results from population pharmacokinetic modeling and simulation in children 3 to less than 12 years of age predicting similar darunavir plasma exposures compared to treatment-naïve adults. Although no clinical trial was conducted to collect exposure-safety data, the predicted exposures from the once daily dosing is supported by exposures observed in a pediatric clinical trial where twice-daily dosing was administered.

Dosing recommendations for treatment-naïve pediatric patients or antiretroviral treatment-experienced pediatric patients with no darunavir resistance associated substitutions

Pediatric patients weighing at least 10 kg but less than 15 kg

The weight-based dose in antiretroviral treatment-naïve pediatric patients or antiretroviral treatment-experienced pediatric patients with no darunavir resistance associated substitutions is PREZISTA 35 mg/kg once daily with ritonavir 7 mg/kg once daily using the following table.

Table 2: Recommended dose for pediatric patients weighing 10 kg to less than 15 kg who are treatment-naïve or treatment-experienced with no darunavir resistance associated substitutions*
Body weight
(kg)
Formulation: PREZISTA oral suspension (100 mg/mL) and Ritonavir oral solution (80 mg/mL)
Dose: once daily with food
*
darunavir resistance associated substitutions: V11I, V32I, L33F, I47V, I50V, I54M, I54L, T74P, L76V, I84V and L89V
The 350 mg, 385 mg, 455 mg and 490 mg darunavir dose for the specified weight groups were rounded up for suspension dosing convenience to 3.6 mL, 4 mL, 4.6 mL and 5 mL, respectively.
Greater than or equal to 10 kg to less than 11 kg
PREZISTA 3.6 mL (350 mg) with ritonavir 0.8 mL (64 mg)
Greater than or equal to 11 kg to less than 12 kg
PREZISTA 4 mL (385 mg) with ritonavir 0.8 mL (64 mg)
Greater than or equal to 12 kg to less than 13 kg
PREZISTA 4.2 mL (420 mg) with ritonavir 1 mL (80 mg)
Greater than or equal to 13 kg to less than 14 kg
PREZISTA 4.6 mL (455 mg) with ritonavir 1 mL (80 mg)
Greater than or equal to 14 kg to less than 15 kg
PREZISTA 5 mL (490 mg) with ritonavir 1.2 mL (96 mg)

Pediatric patients weighing at least 15 kg

Pediatric patients weighing at least 15 kg can be dosed with PREZISTA oral tablet(s) or suspension using the following table:

Table 3: Recommended dose for pediatric patients weighing at least 15 kg who are treatment-naïve or treatment-experienced with no darunavir resistance associated substitutions*
Body Weight
(kg)
Formulation: PREZISTA tablet(s) and ritonavir capsules or tablets (100 mg) Formulation: PREZISTA oral suspension (100 mg/mL) and ritonavir oral solution (80 mg/mL)
Dose: once daily with food Dose: once daily with food
*
darunavir resistance associated substitutions: V11I, V32I, L33F, I47V, I50V, I54M, I54L, T74P, L76V, I84V and L89V
The 675 mg dose using darunavir tablets for this weight group is rounded up to 6.8 mL for suspension dosing convenience.
The 6.8 mL and 8 mL darunavir dose should be taken as two (3.4 mLor 4 mL respectively) administrations with the included oral dosing syringe
Greater than or equal to 15 kg to less than 30 kg PREZISTA 600 mg with ritonavir 100 mg PREZISTA 6 mL (600 mg) with ritonavir 1.25 mL (100 mg)
Greater than or equal to 30 kg to less than 40 kg PREZISTA 675 mg with ritonavir 100 mg PREZISTA 6.8 mL (675 mg) with ritonavir 1.25 mL (100 mg)
Greater than or equal to 40 kg PREZISTA 800 mg with ritonavir 100 mg PREZISTA 8 mL (800 mg) with ritonavir 1.25 mL (100 mg)

Dosing recommendations for treatment-experienced pediatric patients with at least one darunavir resistance associated substitutions

Pediatric patients weighing at least 10 kg but less than 15 kg

The weight-based dose in antiretroviral treatment-experienced pediatric patients with at least one darunavir resistance associated substitution is PREZISTA 20 mg/kg twice daily with ritonavir 3 mg/kg twice daily using the following table:

Table 4: Recommended dose for pediatric patients weighing 10 kg to less than 15 kg who are treatment-experienced with at least one darunavir resistance associated substitution*
Body weight
(kg)
Formulation: PREZISTA oral suspension (100 mg/mL) and Ritonavir oral solution (80 mg/mL)
Dose: twice daily with food
*
darunavir resistance associated substitutions: V11I, V32I, L33F, I47V, I50V, I54M, I54L, T74P, L76V, I84V and L89V
Greater than or equal to 10 kg to less than 11 kg PREZISTA 2 mL (200 mg) with ritonavir 0.4 mL (32 mg)
Greater than or equal to 11 kg to less than 12 kg PREZISTA 2.2 mL (220 mg) with ritonavir 0.4 mL (32 mg)
Greater than or equal to 12 kg to less than 13 kg PREZISTA 2.4 mL (240 mg) with ritonavir 0.5 mL (40 mg)
Greater than or equal to 13 kg to less than 14 kg PREZISTA 2.6 mL (260 mg) with ritonavir 0.5 mL (40 mg)
Greater than or equal to 14 kg to less than 15 kg PREZISTA 2.8 mL (280 mg) with ritonavir 0.6 mL (48 mg)

Pediatric patients weighing at least 15 kg

Pediatric patients weighing at least 15 kg can be dosed with PREZISTA oral tablet(s) or suspension using the following table:

Table 5: Recommended dose for pediatric patients weighing at least 15 kg who are treatment-experienced with at least one darunavir resistance associated substitution*
Body Weight
(kg)
Formulation: PREZISTA tablet(s) and ritonavir tablets, capsules (100 mg) or oral solution (80 mg/mL) Formulation: PREZISTA oral suspension (100 mg/mL) and ritonavir oral solution (80 mg/mL)
Dose: twice daily with food Dose: twice daily with food
*
darunavir resistance associated substitutions: V11I, V32I, L33F, I47V, I50V, I54M, I54L, T74P, L76V, I84V and L89V
The 375 mg and 450 mg dose using darunavir tablets for this weight group is rounded up to 3.8 mL and 4.6 mL for suspension dosing convenience.
Greater than or equal to 15 kg to less than 30 kg PREZISTA 375 mg with ritonavir 0.6 mL (48 mg) PREZISTA 3.8 mL (375 mg) with ritonavir 0.6 mL (48 mg)
Greater than or equal to 30 kg to less than 40 kg PREZISTA 450 mg with ritonavir 0.75 mL (60 mg) PREZISTA 4.6 mL (450 mg) with ritonavir 0.75 mL (60 mg)
Greater than or equal to 40 kg PREZISTA 600 mg with ritonavir 100 mg PREZISTA 6 mL (600 mg) with ritonavir 1.25 mL (100 mg)

Do not use PREZISTA/ritonavir in pediatric patients below 3 years of age [see Warnings and Precautions (5.11) and Nonclinical Toxicology (13.2)].

Patients with Hepatic Impairment

No dose adjustment is required in patients with mild or moderate hepatic impairment. No data are available regarding the use of PREZISTA/ritonavir when co-administered to subjects with severe hepatic impairment; therefore, PREZISTA/ritonavir is not recommended for use in patients with severe hepatic impairment [see Use in Specific Populations (8.6) and Clinical Pharmacology (12.3)].

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