University of California, San Francisco Logo

University of California, San Francisco | About UCSF | Search UCSF | UCSF Medical Center

Home > Treatment > Drug Dosing Toolkit > Prezcobix

Prezista + Tybost (Prezcobix)

Type of Drug: Fixed-Dose Combination
Fixed-dose combinations combine the most commonly prescribed doses of 2 or more medications into a single pill.

Approved adult dosing

Prezista 800 mg + Tybost 150 mg in a single tablet

one tablet, once a day

  • Once daily



Notes on taking this medication

  • Should take with food
  • Prezcobix interacts with many other drugs; persons using Prezcobix with those drugs may need an adjustment to their dose of Prezcobix or the other drugs; consult your medical provider

Same possible side effects as


  • Nausea; diarrhea; stomach discomfort
  • Rash
  • Liver inflammation and increased liver enzyme levels
  • Elevations in cholesterol and triglycerides
  • Elevated blood sugar
  • Persons who are allergic to sulfa drugs may be allergic to Prezista


  • Nausea, diarrhea
  • Headache, fatigue
  • Elevation in blood creatinine levels (this is used to assess kidney function; your provider will monitor creatinine)

See accompanying chart: Tips for Common Side Effects

My doctor's instructions

Scroll over drug name to see other names for the drug.