Mavyret’s two active components clear from your bloodstream at different rates, but both are essentially gone within two to three days after your last dose. The faster-clearing component has a half-life of about 6 hours, while the slower one has a half-life of about 13 hours. Using the standard pharmacology rule that a drug is fully eliminated after roughly five half-lives, the first component clears in about 30 hours and the second in about 65 hours, or just under three days.
Half-Life of Each Component
Mavyret is a combination of two antiviral drugs that work together to eliminate hepatitis C. Each has its own elimination timeline. The first component has a terminal half-life of 6 hours (with a range of 5 to 6.5 hours across study participants). The second has a terminal half-life of 13 hours (range of 11.5 to 13.6 hours). “Terminal half-life” is the time it takes for blood levels to drop by half once the drug is in the elimination phase.
After five half-lives, less than 4% of the original dose remains in your blood. For the faster component, that’s about 30 hours. For the slower one, roughly 65 hours. So within about three days of your final dose, both components have dropped to negligible levels.
How Your Body Eliminates Mavyret
Both components are processed primarily by the liver and excreted through bile into your stool rather than through your kidneys. This is why liver health has a much bigger impact on clearance time than kidney function does. Both drugs are also highly bound to proteins in your blood, with binding rates above 97%. When a drug is heavily protein-bound, only a small fraction is “free” and active at any given moment, but the protein-bound portion acts as a reservoir that gradually releases the drug for processing.
Liver Problems Can Slow Clearance
Because Mavyret depends on the liver for elimination, impaired liver function significantly extends how long the drug stays in your system. In people with moderate liver impairment, blood levels of the first component roughly double compared to people with normal liver function. In severe liver impairment, levels jump to about 11 times higher than normal. The second component is less affected but still sees meaningful increases: 26% higher with moderate impairment and about double with severe impairment.
These elevated levels are the reason Mavyret is not used in people with moderate or severe liver disease. If you have mild liver impairment, clearance times are not significantly changed, and no dose adjustment is needed.
Kidney Disease Has a Smaller Effect
Severe kidney impairment (including being on dialysis) raises blood levels of both components by roughly 46% to 56%, but this increase is modest enough that no dose adjustment is required. In people on hemodialysis, drug levels were similar whether Mavyret was taken before a dialysis session or on a non-dialysis day, meaning dialysis does not meaningfully remove the drug from your blood. This makes sense given that Mavyret is eliminated through the liver, not the kidneys.
Other Medications That Affect Clearance
Certain drugs can slow Mavyret’s elimination by interfering with the liver transport proteins responsible for clearing it. The most dramatic example involves certain HIV medications: when taken with atazanavir plus ritonavir, blood levels of the first Mavyret component increase more than sixfold. Lopinavir/ritonavir raises levels roughly fourfold. High-dose cyclosporine (an immune-suppressing drug used after organ transplants) has a similar effect, boosting levels about fivefold.
These increases don’t just mean the drug is more potent while you’re taking it. They also mean it takes longer to fully clear your system after the last dose, because your liver is processing a larger backlog. If you’re taking any of these medications alongside Mavyret, your prescriber will already be aware of the interaction, but it’s worth knowing that your clearance timeline could stretch beyond the typical three-day window.
What This Means in Practical Terms
For most people finishing a standard Mavyret course, both active ingredients will be out of your bloodstream within about three days. If you have normal liver and kidney function and aren’t taking interacting medications, there’s no reason to expect the drug to linger beyond that window. The drug’s antiviral effects, however, are separate from how long the medication itself stays in your body. Mavyret works by stopping the hepatitis C virus from replicating, and once a full treatment course is completed (typically 8 to 16 weeks depending on your situation), the virus should already be eliminated regardless of when the last traces of medication clear your blood.