IV to oral conversion
Equivalent oral dose for common IV-to-oral switches, with the bioavailability basis.
Inputs
1 of 2Drug
mg
When to use
- Switching a stable patient who can take oral medicines.
Pearls and pitfalls
- Antimicrobial switch criteria: improving, afebrile 24–48 h, functioning gut, no high-risk infection (endocarditis, CNS).
- Chelation: separate fluoroquinolones and tetracyclines from calcium, iron, magnesium.
Why use
The factor and its basis, not just the number.
Oral dose = IV dose × conversion factor (from oral bioavailability)