Contraindicated in:
Use Cautiously in:
CV: hypertension.
Derm: STEVENS-JOHNSON SYNDROME, TOXIC EPIDERMAL NECROLYSIS.
GI: ↑ liver enzymes, abdominal pain, diarrhea, nausea, vomiting.
MS: myalgia.
Neuro: dysgeusia, headache.
Drug-Drug:
Drug-Natural Products:
Renal Impairment
Nirmatrelvir
Absorption: Well absorbed.
Distribution: Extensively distributed to extravascular tissues.
Metabolism/Excretion: CYP3A4 substrate; minimal metabolism by this isoenzyme when coadministered with ritonavir. Excreted in feces (49.6%) and urine (35.3%);.
Half-life: 6 hr.
Ritonavir
Absorption: Well absorbed.
Distribution: Extensively distributed to extravascular tissues.
Protein Binding: 9899%.
Metabolism/Excretion: Primarily metabolized in the liver via the CYP3A isoenzyme, and to a lesser extent by the CYP2D6 isoenzyme. Primarily excreted in feces (86.4%), with 11.3% excreted in urine.
Half-life: 6 hr.
(plasma concentrations)
ROUTE | ONSET | PEAK | DURATION |
---|---|---|---|
PO (nirmatrelvir) | unknown | 3 hr | 12 hr |
PO (ritonavir) | unknown | 4 hr | 12 hr |