Skip to main content

Have a prescription for an Emergency Use Authorized COVID-19 treatment option? Find out where to fill it. Visit the U.S. Department of Health and Human Services' (HHS) Test-to-Treat Site*

*This link will take you to a website that is owned and operated by HHS. Merck is not responsible for content or maintenance of the site.


How to Take LAGEVRIO™ (molnupiravir)

Take LAGEVRIO exactly as your healthcare provider tells you to take it and refer to your Patient Fact Sheet.

Capsules Icon

800 mg (or FOUR 200 mg CAPSULES)

Capsule images for illustrative purposes only.


Day and Night Icon

TAKEN ORALLY EVERY 12 HOURS


Calendar Icon

FOR5 DAYS


Plate Icon

WITH ORWITHOUT FOOD

  • Take 4 capsules of LAGEVRIO every 12 hours (for example, at 8 am and at 8 pm).
  • Take LAGEVRIO for 5 days. It is important that you complete the full 5 days of treatment with LAGEVRIO. Do not stop taking LAGEVRIO before you complete the full 5 days of treatment, even if you feel better.
  • Take LAGEVRIO with or without food.
  • You should stay in isolation for as long as your healthcare provider tells you to. Talk to your healthcare provider if you are not sure about how to properly isolate while you have COVID-19.
  • Swallow LAGEVRIO capsules whole. Do not open, break, or crush the capsules. If you cannot swallow capsules whole, tell your healthcare provider.

What to do if you miss a dose of LAGEVRIO

    • If it has been less than 10 hours since the missed dose, take it as soon as you remember.
    • If it has been more than 10 hours since the missed dose, skip the missed dose and take your dose at the next scheduled time.
    • Do not double the dose of LAGEVRIO to make up for a missed dose.

AUTHORIZED USE
  • LAGEVRIO™ (molnupiravir) is an investigational medicine used to treat mild-to-moderate COVID-19 in adults:
    • with positive results of direct SARS-CoV-2 viral testing, and
    • who are at risk for progression to severe COVID-19 including hospitalization or death, and for whom other COVID-19 treatment options approved or authorized by the FDA are not accessible or clinically appropriate
  • LAGEVRIO is not authorized:
    • For use in people less than 18 years of age
    • For prevention of COVID-19
    • For patients needing hospitalization for COVID-19
    • For use for longer than 5 consecutive days

IMPORTANT SAFETY INFORMATION

  • LAGEVRIO may cause harm to your unborn baby. It is not known if LAGEVRIO will harm your baby if you take LAGEVRIO during pregnancy. LAGEVRIO is not recommended for use in pregnancy and has not been studied in pregnancy.
  • You and your healthcare provider may decide that you should take LAGEVRIO during pregnancy if there are no other COVID-19 treatment options approved or authorized by the FDA that are accessible or clinically appropriate for you. If you and your healthcare provider decide that you should take LAGEVRIO during pregnancy, you and your healthcare provider should discuss the known and potential benefits and the potential risks of taking LAGEVRIO during pregnancy.
  • Individuals who are able to become pregnant should use a reliable method of birth control (contraception) consistently and correctly during treatment with LAGEVRIO and for 4 days after the last dose of LAGEVRIO. Talk to your healthcare provider about reliable birth control methods and tell your healthcare provider right away if you become pregnant or think you may have become pregnant during treatment with LAGEVRIO. Before starting treatment with LAGEVRIO your healthcare provider may do a pregnancy test to see if you are not pregnant.
  • There is a pregnancy surveillance program for individuals who take LAGEVRIO during pregnancy. The purpose of this program is to collect information about the health of you and your baby. Talk to your healthcare provider about how to take part in this program. If you take LAGEVRIO during pregnancy and you agree to participate in the pregnancy surveillance program and allow your healthcare provider to share your information with Merck, then your healthcare provider will report your use of LAGEVRIO during pregnancy to Merck by calling 1-877-888-4231 or pregnancyreporting.msd.com
  • It is not known if LAGEVRIO can affect sperm. A reliable method of birth control (contraception) should be used consistently and correctly during treatment with LAGEVRIO and for at least 3 months after the last dose. The risk to sperm beyond 3 months is not known. Talk to your healthcare provider about reliable birth control methods or if you have questions or concerns about how LAGEVRIO may affect sperm.
  • Before taking LAGEVRIO, tell your healthcare provider about all of your medical conditions including if you have any allergies, serious illnesses, or are pregnant or plan to become pregnant, are breastfeeding or plan to breastfeed.
  • Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.
  • Allergic reactions can happen in people taking LAGEVRIO even after only 1 dose. Stop taking LAGEVRIO and call your healthcare provider right away if you get any of the following symptoms of an allergic reaction: hives, rapid heartbeat, trouble swallowing or breathing, swelling of the mouth, lips, or face, throat tightness, hoarseness, or skin rash.
  • The most common side effects of LAGEVRIO are diarrhea, nausea, and dizziness. These are not all the possible side effects of LAGEVRIO. Serious and unexpected side effects may happen. This medicine is still being studied, so it is possible that all of the risks are not known at this time. Contact your healthcare provider if you have any side effects that bother you or do not go away.
  • Breastfeeding is not recommended during treatment with LAGEVRIO and for 4 days after the last dose of LAGEVRIO. If you are breastfeeding or plan to breastfeed, talk to your healthcare provider about your options and specific situation before taking LAGEVRIO.
  • Take LAGEVRIO exactly as your healthcare provider tells you to take it. Take LAGEVRIO for 5 days. It is important that you complete the full 5 days of treatment with LAGEVRIO. Do not stop taking LAGEVRIO before you complete the full 5 days of treatment, even if you feel better.
  • Contact your healthcare provider if you have any side effects that bother you or do not go away. Report side effects to FDA MedWatch at www.fda.gov/medwatch or call 1-800-FDA-1088 (1-800-332-1088)

Please read the accompanying Fact Sheet for Patients and Caregivers and discuss it with your doctor. The Fact Sheet for Healthcare Providers is also available.