Nirmatrelvir+ritonavir
About Nirmatrelvir+ritonavir
Nirmatrelvir+ritonavir is a prescription antiviral medication used to treat mild-to-moderate COVID-19 in adults and children 12 years of age and older who weigh at least 40 kg. It is prescribed for individuals who are at high risk of developing severe illness or requiring hospitalisation. This medicine helps stop the virus from multiplying in your body, allowing your immune system to fight off the infection more effectively.
You must take Nirmatrelvir+ritonavir twice daily for five consecutive days, exactly as prescribed by your doctor. It is highly important to complete the entire five-day course, even if you start to feel better sooner, to ensure the virus is fully cleared. You can take these tablets with or without food, and staying well-hydrated while resting is highly recommended during your recovery.
Some people taking this medicine may experience temporary side effects like an unusual or metallic taste in the mouth, diarrhoea, or mild muscle aches. While these are usually mild, you must contact your doctor immediately if you experience signs of an allergic reaction, such as swelling of your face or throat, severe skin rashes, or difficulty breathing.
Before starting this medicine, talk to your doctor if you have a history of liver damage, kidney disease, or if you are living with untreated HIV-1. Do not take this if you have severe kidney or severe liver damage, or if you are taking certain medications that interact dangerously with it.
This medicine can interact widely with other prescription drugs and alcohol because it affects how your liver breaks down substances, which can cause unsafe side effects. If you are pregnant, planning to become pregnant, breastfeeding, or are an elderly individual, consult your healthcare provider to discuss the risks and benefits before beginning treatment.
Uses of Nirmatrelvir+ritonavir
Medicinal Benefits
Nirmatrelvir+ritonavir helps treat viral infections by preventing the virus from multiplying in the body. When started as directed, it helps reduce the severity of illness, supports faster recovery, and lowers the risk of serious complications.
- Promotes Faster Recovery: By slowing the replication of the virus, this medicine helps your body clear the infection more efficiently, reducing symptoms and helping you regain your strength sooner.
- Reduces the Risk of Severe Illness: When taken early in the course of infection, this medicine helps lower the risk of hospitalisation, emergency medical care, and other serious complications in eligible patients.
- Convenient Oral Treatment: As an oral medicine, this treatment can be taken at home as prescribed, allowing you to complete the full course comfortably while recovering and following isolation recommendations.
Directions for Use
- Nirmatrelvir+ritonavir can be taken with or without food, as food does not affect its absorption or effectiveness.
- Nirmatrelvir+ritonavir is usually taken twice a day, or as prescribed by your doctor.
- Swallow Nirmatrelvir+ritonavir as a whole with a glass of water.
- Do not break, chew or crush Nirmatrelvir+ritonavir.
Storage
Side Effects of Nirmatrelvir+ritonavir
Common Side Effects (Usually mild):
- Altered or metallic taste in the mouth
- Loose stools or diarrhoea
- Mild headache or muscle aches
- Slight increase in blood pressure
Serious Side Effects (Consult a doctor right away):
- Signs of an allergic reaction, such as hives, swelling of the face, lips, tongue, or throat, and difficulty breathing or swallowing
- Signs of liver damage, including yellowing of the skin or eyes, dark urine, pale stools, or severe upper stomach pain
- Severe, persistent dizziness or fainting
Drug Warnings
- Check your kidney health: Ensure your doctor knows your kidney function history, as a dose adjustment may be required if you have moderate kidney issues.
- Finish the full course: Complete all 5 days of treatment even if you feel completely recovered; stopping early can allow the virus to rebound.
- Do a complete medicine check: Provide your pharmacist with a comprehensive list of all medications, vitamins, and herbal supplements you take before starting Nirmatrelvir+ritonavir to avoid dangerous interactions.
- Monitor blood pressure: If you have high blood pressure, monitor your readings closely during your treatment course, as this medicine can occasionally cause a temporary rise in blood pressure.
- Use backup contraception: If you use hormonal birth control (such as pills, patches, or rings), use an effective barrier method (like condoms) during treatment and for one menstrual cycle after finishing, as this medicine can reduce birth control effectiveness.
Drug Interactions
- Statins, Blood Thinners, Seizure Medicines, Heart Rhythm Medicines, and St. John's Wort: Nirmatrelvir+ritonavir may interact with certain cholesterol-lowering medicines (statins), blood thinners, seizure medicines, heart rhythm medicines, and herbal supplements such as St. John's Wort. These interactions may increase the levels of some medicines in your bloodstream, raising the risk of serious side effects, or reduce the effectiveness of Nirmatrelvir+ritonavir. Always inform your doctor about all prescription medicines, over-the-counter products, and herbal supplements you are taking.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
cautionThe interaction of Nirmatrelvir+ritonavir with alcohol is unknown. Please consult a doctor before consuming alcohol while using Nirmatrelvir+ritonavir.
Pregnancy
cautionIf you are pregnant or planning to become pregnant, please seek medical advice. Pregnant women are only given Nirmatrelvir+ritonavir if their doctor believes the benefits outweigh the risks.
Breast Feeding
cautionIf Nirmatrelvir+ritonavir is prescribed during breastfeeding, the doctor may advise you to stop breastfeeding as this medicine can pass into breast milk.
Driving
cautionLimited information is available about using Nirmatrelvir+ritonavir while driving, so please consult a doctor if you have any concerns.
Liver
cautionNirmatrelvir+ritonavir should be used with caution, especially if you have a history of liver disease or condition. Please seek medical advice. Avoid taking Nirmatrelvir+ritonavir if you have severe liver problems.
Kidney
cautionTake Nirmatrelvir+ritonavir with caution, especially if you have a history of kidney diseases/conditions. The dose may be adjusted by your doctor as required. Avoid taking Nirmatrelvir+ritonavir if you have severe kidney problems.
Children
cautionNirmatrelvir+ritonavir is not recommended for children and adolescents below 18 years as safety and effectiveness have not been established.
Habit Forming
Diet & Lifestyle Advise
- Prioritise deep rest: Keep your physical activity to a minimum during your 5-day treatment course to allow your immune system to focus entirely on fighting the infection.
- Stay well-hydrated: Drink plenty of fluids like water, clear broths, or herbal teas to prevent dehydration, especially if you experience diarrhoea as a side effect.
- Avoid alcohol: Refrain from drinking alcohol during your treatment, as it can strain your liver and worsen side effects like dizziness or nausea.
- Isolate properly: Continue to follow local isolation guidelines to protect others, as taking Nirmatrelvir+ritonavir does not instantly stop you from spreading the virus to people around you.
Special Advise
- Appropriate laboratory testing should be performed before starting Nirmatrelvir+ritonavir and at regular intervals or if any clinical signs or symptoms appear during therapy.
- Nirmatrelvir+ritonavir may reduce the effectiveness of hormonal contraceptives.
Patients Concern
Disease/Condition Glossary
COVID-19: Coronavirus disease, also known as SARS-CoV-2 (Severe Acute Respiratory Syndrome Corona Virus 2), is an infectious disease caused by the coronavirus. It belongs to a group of RNA viruses and has crown-like projections on the pathogen's surface. The virus transmits through droplets generated from an infectious person's cough, sneeze or heavy breathing. The common symptoms of Coronavirus disease are dry cough, breathlessness, shortness of breath, tiredness, body pains, headache, fever, loss of sense of taste and smell, diarrhoea, and sore throat.
FAQs
Nirmatrelvir+ritonavir belongs to a class of drugs called antiviral medications, which are primarily used to treat COVID-19. SARS-CoV-2 is the virus that causes COVID-19, a respiratory disease that can produce mild to severe symptoms.
Nirmatrelvir+ritonavir works by preventing the virus from replicating within the cells, which helps to stop its spread in the body. Thereby it prevents the production of the new virus.
If you miss a dose within 8 hours of your usual time, take it as soon as you remember. If more than 8 hours have passed, skip the missed dose and continue with your regular dosing schedule. Do not take two doses simultaneously to make up for a missed dose.
Inform your doctor if you are taking Atorvastatin. Combining these drugs may elevate atorvastatin levels in the blood. This increases the chance of side effects such as liver damage and rhabdomyolysis, an uncommon but deadly illness characterised by the breakdown of skeletal muscle tissue.
You are recommended to inform your doctor before taking any other medicines with Nirmatrelvir+ritonavir. Your doctor will notify you regarding medicines that should not be taken along with Nirmatrelvir+ritonavir.
Nirmatrelvir+ritonavir is used with Ritonavir to help it remain in your body longer and work more effectively. It slows the breakdown of ritonavir, allowing you to experience a stronger effect from the medication. This combination helps better manage COVID-19 and improve your treatment results.
Do not stop taking Nirmatrelvir+ritonavir without consulting your doctor, as it may reduce the medication’s effectiveness. To treat your condition effectively, continue taking Nirmatrelvir+ritonavir for as long as prescribed by your doctor. If you experience any difficulty taking Nirmatrelvir+ritonavir, do not hesitate to speak with your doctor.
The side effects of Nirmatrelvir+ritonavir include diarrhoea, nausea, vomiting, abdominal pain and dysgeusia (change in taste). Consult the doctor if any of these side effects persist or worsen
It is highly recommended to avoid alcohol while taking Nirmatrelvir+ritonavir. Alcohol can put extra stress on your liver and worsen common side effects like nausea, dizziness, and diarrhoea. Talk to your doctor or pharmacist if you have concerns.
An altered or metallic taste in the mouth is a very common, temporary side effect of Nirmatrelvir+ritonavir. It typically resolves shortly after you complete your 5-day course. You can manage this by chewing sugar-free gum, sucking on hard candies, or maintaining good oral hygiene. Talk to your doctor or pharmacist if it becomes intolerable.
There is limited data on using this medicine during pregnancy or breastfeeding. Your doctor will weigh the benefits of treating your COVID-19 infection against any potential risks to your baby. Talk to your doctor or pharmacist to make an informed decision.
Yes, Nirmatrelvir+ritonavir can make hormonal contraceptives (including pills, patches, or vaginal rings) less effective. You should use a reliable barrier method of contraception, such as condoms, while taking this medicine and for at least one full menstrual cycle after your last dose. Talk to your doctor or pharmacist for specific advice.
If you have mild to moderate kidney disease, your doctor may need to adjust your dose. However, this medicine is not recommended for individuals with severe kidney disease. Always inform your healthcare provider about your kidney function before starting treatment. Talk to your doctor or pharmacist for more information.
You should start taking Nirmatrelvir+ritonavir as soon as possible after receiving a positive COVID-19 test result, and strictly within 5 days of your first symptoms appearing. The medicine is most effective when started early in the infection. Talk to your doctor or pharmacist immediately if you test positive and are at high risk.
