Paxlovid Is an Oral Antiviral Medication Used to Treat Mild-to-Moderate COVID-19 in Adults at High Risk for Severe Illness

If you or someone you care about has tested positive for COVID-19, you may have heard the name Paxlovid. It's one of the most important treatment options available — an antiviral pill you can take at home to help prevent hospitalization and death. But with multiple dose strengths, strict timing requirements, and a long list of drug interactions, there's a lot to understand before you start.

This guide covers everything you need to know about Paxlovid in plain, clear language.

What Is Paxlovid?

Paxlovid is the brand name for a combination of two antiviral medications: Nirmatrelvir and Ritonavir. It is manufactured by Pfizer Inc. and belongs to the protease inhibitor drug class.

Here are the key facts:

• Brand name: Paxlovid
• Generic name: Nirmatrelvir/Ritonavir
• Manufacturer: Pfizer Inc.
• Drug class: Protease inhibitor combination (antiviral)
• FDA status: FDA-approved for treatment of mild-to-moderate COVID-19 in high-risk adults
• Controlled substance: No — Paxlovid is not a controlled substance
• Generic available: No generic version is available in the U.S. as of early 2026

Paxlovid comes as a dose pack containing two types of tablets: pink Nirmatrelvir tablets (150 mg each) and white Ritonavir tablets (100 mg each).

What Is Paxlovid Used For?

Paxlovid is approved for the treatment of mild-to-moderate COVID-19 in adults who are at high risk for progression to severe disease, including hospitalization or death.

High-risk factors include:

• Age 65 or older
• Obesity (BMI 25+)
• Diabetes
• Heart disease or hypertension
• Chronic lung disease (asthma, COPD)
• Immunosuppression (organ transplant, cancer treatment, HIV)
• Chronic kidney disease
• Sickle cell disease
• Smoking (current or former)

Paxlovid is not approved for preventing COVID-19 (pre-exposure or post-exposure prophylaxis), though this has been studied. It is also being investigated for potential benefits in Long COVID, but this is not yet an approved use.

How Is Paxlovid Taken?

Paxlovid is taken by mouth, twice daily, for 5 days. Each dose consists of:

Standard Dose (Normal Kidney Function)

• Two Nirmatrelvir 150 mg tablets (300 mg total) plus
• One Ritonavir 100 mg tablet
• All three tablets taken together, twice daily (morning and evening)

Reduced Dose (Moderate Kidney Impairment — eGFR 30–59 mL/min)

• One Nirmatrelvir 150 mg tablet plus
• One Ritonavir 100 mg tablet
• Both tablets taken together, twice daily

Important timing: Treatment must be started within 5 days of symptom onset. The sooner you start, the more effective it is. Complete the full 5-day course even if you feel better before it's done.

You can take Paxlovid with or without food. Swallow the tablets whole — do not crush, break, or chew them.

Who Should Not Take Paxlovid?

Paxlovid is not right for everyone. You should not take it if you:

• Have a known allergy to Nirmatrelvir, Ritonavir, or any ingredient in the dose pack
• Take certain medications that have dangerous interactions with Ritonavir — including Lovastatin, Simvastatin, Amiodarone, Pimozide, Lurasidone, Triazolam, oral Midazolam, ergot derivatives, and Sildenafil (when used for pulmonary hypertension)
• Take potent CYP3A inducers that could reduce Paxlovid's effectiveness — including Rifampin, Carbamazepine, Phenobarbital, Phenytoin, and St. John's Wort
• Have severe kidney impairment (eGFR below 30 mL/min)
• Have severe liver impairment

Paxlovid is not authorized for patients under 18 who weigh less than 40 kg. If you are pregnant or breastfeeding, discuss the risks and benefits with your doctor — breastfeeding is not recommended during treatment.

How Much Does Paxlovid Cost?

The cash price for a 5-day course of Paxlovid ranges from $1,200 to $1,500.

However, most patients pay significantly less:

• Commercial insurance: Most plans cover Paxlovid, though prior authorization may be required. Your copay will depend on your plan.
• Medicare Part D: Generally covered, but formulary placement and cost-sharing vary by plan.
• Pfizer Patient Assistance Program: Eligible uninsured and underinsured patients may receive Paxlovid at no cost through Pfizer RxPathways (pfizerRxpathways.com).
• Copay assistance: Pfizer offers a copay card for commercially insured patients that may reduce out-of-pocket costs to as low as $0.

For a complete breakdown of savings options, read our guide to saving money on Paxlovid.

Final Thoughts

Paxlovid remains one of the most effective tools we have for treating COVID-19 at home and keeping high-risk patients out of the hospital. If you test positive, have risk factors, and are within the 5-day symptom window, talk to your doctor about whether Paxlovid is right for you.

The biggest challenge is often finding it and filling the prescription quickly. Medfinder can help you locate pharmacies with Paxlovid in stock near you so you can start treatment as soon as possible.