Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
In rare cases, Mavyret may cause serious liver injury. Call your doctor right away if you have symptoms such as:
right-sided upper stomach pain;
nausea, vomiting, loss of appetite;
confusion, tiredness, feeling light-headed;
easy bruising or bleeding, vomiting blood;
diarrhea, black or bloody stools;
dark urine; or
yellowing of your skin or eyes.
Common side effects may include:
headache; or
feeling tired.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Mavyret side effects (more detail)
