Paxlovid is taken as three pills, twice a day, for five days. Each dose includes two tablets of the antiviral component and one tablet of a booster that helps the antiviral stay active in your body longer. You take it in the morning and again at bedtime, with or without food, for a total of 30 pills over the full course.
What Each Dose Looks Like
Every dose of Paxlovid contains three pills: two pink tablets (nirmatrelvir, the antiviral) and one white tablet (ritonavir, the booster). All three are taken together at the same time. The medication comes in a blister pack with each dose pre-organized, one card per day, so it’s straightforward to track what you’ve taken.
You can take the pills with or without food. The official product label says to swallow the tablets whole without crushing or chewing. However, phase I studies have shown that both components can be split or crushed and mixed into soft foods like applesauce or pudding without affecting how much of the drug your body absorbs. If you have difficulty swallowing pills, this is worth discussing with your pharmacist.
When to Start Treatment
Paxlovid needs to be started within five days of your first COVID-19 symptoms. The earlier you begin, the more effective it is, so the goal is to start as soon as possible after a positive test. This means getting a prescription quickly matters. If you’re past the five-day window, the drug is unlikely to provide meaningful benefit.
What to Do If You Miss a Dose
If you realize you missed a dose and it’s been less than eight hours since you were supposed to take it, go ahead and take it. Then return to your normal schedule. If more than eight hours have passed, skip that dose entirely and take the next one at its regular time. Don’t double up to make up for a missed dose.
Reduced Dose for Kidney Issues
People with moderate kidney impairment take a lower dose: one antiviral tablet plus one booster tablet, twice daily for five days. That’s two pills per dose instead of three. Your pharmacist will actually remove the extra tablet from each blister card before dispensing it to you, so the packaging reflects your correct dose. Paxlovid is not recommended for people with severe kidney impairment.
The Metallic Taste and Other Side Effects
The most talked-about side effect is a bitter or metallic taste in your mouth, sometimes described as “Paxlovid mouth.” In post-marketing reports, roughly 17.5% of people experienced this altered taste. It can be persistent and unpleasant, but it goes away after you finish the course. Some people find that strong-flavored foods, mints, or citrus help mask it. Diarrhea is another commonly reported side effect.
Drug Interactions Are a Serious Concern
The booster component in Paxlovid works by blocking a specific enzyme your liver uses to break down drugs. This is useful because it keeps the antiviral at effective levels in your bloodstream. The problem is that same enzyme is responsible for processing roughly 60% of all medications on the market. That makes Paxlovid one of the most interaction-heavy drugs you can take, even for just five days.
Several categories of medications are either completely off-limits during treatment or need dose adjustments:
- Blood thinners: Some, like rivaroxaban, are contraindicated. Others, like warfarin, require close monitoring.
- Cholesterol-lowering statins: Simvastatin and lovastatin cannot be taken with Paxlovid. Atorvastatin requires caution.
- Heart rhythm medications: Several common antiarrhythmics, including amiodarone and flecainide, are contraindicated.
- Seizure medications: Carbamazepine and phenytoin are contraindicated because they can reduce Paxlovid’s effectiveness.
- Sedatives and anxiety medications: Diazepam and triazolam are contraindicated. Alprazolam requires caution.
- Immunosuppressants: Drugs like cyclosporine and tacrolimus, common in organ transplant recipients, need careful dose management.
- Certain antipsychotics: Clozapine and lurasidone are contraindicated.
- Opioid pain medications: Fentanyl and methadone require caution due to increased levels in the body.
- St. John’s wort: This herbal supplement can reduce Paxlovid’s effectiveness and should not be taken during treatment.
This is not a complete list. Before starting Paxlovid, your prescriber or pharmacist will review everything you take, including supplements and over-the-counter medications. In some cases, you may need to temporarily pause a medication for the five-day treatment course. Don’t stop or adjust any medications on your own.
COVID Rebound After Treatment
Some people feel better during the five-day course, then experience a return of symptoms two to eight days after finishing treatment. This is known as COVID rebound. In a 2022 study, about 2.3% of Paxlovid-treated patients had symptom rebound within seven days, and about 5.9% experienced it within 30 days. Notably, rebound occurred at similar rates with other COVID antivirals, suggesting it isn’t unique to Paxlovid. Rebound episodes are generally mild and resolve on their own. A second course of Paxlovid is not currently a standard recommendation for rebound.
Storage
Keep Paxlovid at room temperature, between 68°F and 77°F (20°C to 25°C). The blister packs don’t need refrigeration. Store them away from moisture and direct heat.