Patient leaflet - Lagevrio 200 mg hard capsules
1. What Lagevrio is and what it is used for
Lagevrio contains the active substance molnupiravir. Lagevrio is an antiviral medicine used to treat mild to moderate COVID-19 (caused by SARS-CoV-2) in adults who are at risk for developing severe illness.
Lagevrio may help people with COVID-19 stay out of the hospital and feel better.
2. What you need to know before you take Lagevrio
Do not take Lagevrio
- if you are allergic to molnupiravir or any of the other ingredients of this medicine (listed in section 6).
Warnings and precautions
Talk to your doctor or pharmacist before taking molnupiravir.
During treatment, if you experience an allergic reaction (such as swelling of the mouth, lips or face, difficulty in breathing or swallowing, skin rash, reddening of the skin), contact your doctor straight away as you may need urgent medical treatment.
Children and adolescents
Do not give this medicine to children and adolescents aged less than 18 years. The use of Lagevrio in persons aged less than 18 years has not yet been studied.
Other medicines and Lagevrio
Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines.
Pregnancy and breast-feeding
Animal studies with molnupiravir have shown harmful effects to the unborn animal. Lagevrio is not recommended in pregnancy. Lagevrio has not been studied in pregnancy and it is not known if Lagevrio will harm your baby while you are pregnant.
If you are pregnant, think you may be pregnant, or are planning to have a baby, ask your doctor for advice. If you can become pregnant, you should use effective birth control while you are taking Lagevrio and for 4 days after the last dose of Lagevrio.
If you are breast-feeding or are planning to breastfeed, tell your doctor before taking this medicine. Breast-feeding is not recommended during treatment and for 4 days after the last dose of Lagevrio. This is because it is not known if Lagevrio gets into breast milk and will be passed to the baby.
Driving and using machines
No studies on the effects on the ability to drive and use machines have been performed.
Lagevrio contains sodium
This medicine contains less than 1 mmol sodium (23 mg) per dose of 4 capsules, that is to say essentially ‘sodium-free’.
3. How to take Lagevrio
Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
You should start Lagevrio within 5 days of the onset of COVID-19 symptoms.
How much to take
The recommended dose of Lagevrio is four 200 mg capsules, every 12 hours for 5 days. It is important that you complete the full 5 days of treatment with molnupiravir. Do not stop taking molnupiravir before you complete the full 5 days of treatment, even if you feel better.
How to take
- Swallow the capsule whole with plenty of fluid (for instance a glass of water)
This medicine can be taken with or without food.
If you take more Lagevrio than you should
If you take more Lagevrio than you should, contact your doctor straight away.
If you forget to take Lagevrio
- It is important that you do not miss or skip doses of this medicine.
- If you forget to take a dose within 10 hours of the time it is usually taken, you should take it as soon as possible and take the next one at the usual time.
- If you forget to take a dose by more than 10 hours, you should not take the missed dose and instead take the next one at the usual time. • Do not take a double dose to make up for a missed dose.
- If you are not sure what to do, call your doctor or pharmacist.
Do not stop taking Lagevrio
Do not stop taking Lagevrio without talking to your doctor first. This will give the medicine the best chance to keep you from becoming severely ill from COVID-19.
If you have any further questions on the use of this medicine, ask your doctor or pharmacist.
4. Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Common: may affect up to 1 in 10 people
- diarrhoea
- nausea
- feeling dizzy
Uncommon: may affect up to 1 in 100 people
- allergic reactions including rash, hives and swelling of the mouth, lips or face
- redness of the skin
- headache
- vomiting
- itching
Reporting of side effects
If you get any side effects, talk to your doctor, pharmacist, or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Coronavirus Yellow Card Reporting site at https://coronavirus-yellowcard.mhra.gov.uk or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects, you can help provide more information on the safety of this medicine.
5. How to store Lagevrio
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the carton and bottle label after EXP. The expiry date refers to the last day of that month.
This medicinal product does not require any special temperature storage conditions. Store in the original package.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help to protect the environment.
6. Contents of the pack and other information
What Lagevrio contains
The active substance is molnupiravir. Each hard capsule contains 200 mg of molnupiravir.
The other ingredients are:
Capsule content: Croscarmellose sodium (E468), hydroxypropyl cellulose (E463), magnesium stearate (E470b), microcrystalline cellulose (E460).
Capsule shell: Hypromellose (E464), titanium dioxide (E171), red iron oxide (E172).
Printing ink: Butyl alcohol, dehydrated alcohol, isopropyl alcohol, potassium hydroxide, propylene glycol (E1520), purified water, shellac, strong ammonia solution, and titanium dioxide (E171).
What Lagevrio looks like and contents of the pack
Lagevrio 200 mg hard capsule is a Swedish Orange opaque, size 0 (approximately 21.7 mm x 7.6 mm) hard capsule, printed with MSD corporate logo on the cap and “82” on the body in white ink.
Lagevrio 200 mg hard capsules are supplied in high-density polyethylene (HDPE) bottles with a polypropylene cap containing 40 capsules.
Marketing Authorisation Holder and Manufacturer
Marketing Authorisation Holder:
Merck Sharp & Dohme (UK) Limited
120 Moorgate
London
EC2M 6UR
United Kingdom
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Manufacturer:
Merck Sharp & Dohme B.V.
Waarderweg 39
2031 BN Haarlem
The Netherlands
For any information about this medicine, please contact:
Merck Sharp & Dohme (UK) Limited
This leaflet was last revised in October 2025
This medicinal product has been authorised under ‘exceptional circumstances’. This means that it has not been possible to obtain complete information on this medicinal product. The Medicines and Healthcare product Regulatory Agency (MHRA) will review any new information which may become available every year and this leaflet will be updated as necessary.
Other sources of information
www.molnupiravir.com/uk
© 2025 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.
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