Most sinus infections are viral and clear up on their own within 7 to 10 days, so the right medicine for most people is something that manages symptoms while the body heals. Antibiotics only help when the infection is bacterial, which accounts for a small fraction of cases. The best approach combines the right over-the-counter remedies with a clear understanding of when to push for a prescription.
Most Sinus Infections Don’t Need Antibiotics
About 90% of sinus infections start with a virus, the same kind that causes the common cold. No antibiotic will shorten or improve a viral sinus infection. Updated clinical guidelines now recommend “watchful waiting” as the preferred initial approach for most sinus infections, including many that are bacterial, because the majority of people recover without antibiotics.
A bacterial sinus infection is suspected when symptoms persist without any improvement for at least 10 days, or when you start to feel better and then get noticeably worse again (sometimes called “double sickening”). The hallmark signs include thick, discolored nasal discharge, facial pain or pressure that’s worse on one side, and fever above 100.4°F. If your symptoms fit that pattern, that’s when antibiotics become appropriate.
When antibiotics are prescribed, the Infectious Diseases Society of America recommends amoxicillin-clavulanate as the first choice for adults. If you have a penicillin allergy, doxycycline is a common alternative. A typical course lasts five to seven days. Shorter courses are now preferred over the 10- to 14-day prescriptions that were once standard.
Pain Relievers for Sinus Pressure
Facial pressure and headache are usually the symptoms that send people searching for relief. Both ibuprofen and acetaminophen work well here, and they tackle the problem differently. Ibuprofen reduces inflammation in the swollen sinus tissue itself, which can ease both pain and pressure. Acetaminophen lowers pain signals but doesn’t address inflammation directly. For sinus infections specifically, ibuprofen tends to be the more useful option because swelling is a major part of what makes you miserable.
For ibuprofen, over-the-counter doses of 200 to 400 mg every six to eight hours are standard, with a daily ceiling of 1,200 mg for self-treated pain. Acetaminophen can be taken at 500 to 1,000 mg per dose, up to four times a day, with at least four hours between doses and a maximum of 4,000 mg in 24 hours. You can alternate between the two if one alone isn’t enough, since they work through different pathways and don’t interact with each other.
Decongestants: Choose Carefully
Congestion is the core misery of a sinus infection, and your choice of decongestant matters more than you might think. Many popular oral cold medicines contain phenylephrine as their decongestant. The FDA has proposed removing oral phenylephrine from the market after a comprehensive review concluded it simply doesn’t work at recommended doses. An advisory committee voted unanimously that the scientific data do not support its effectiveness as a nasal decongestant.
Pseudoephedrine, sold behind the pharmacy counter (you’ll need to show ID but don’t need a prescription), is the oral decongestant with actual clinical backing. It constricts swollen blood vessels in the nasal passages and can meaningfully open your airways. If you’re buying an oral decongestant, check the active ingredients and look for pseudoephedrine rather than phenylephrine.
Medicated nasal sprays containing oxymetazoline (the active ingredient in Afrin and similar products) deliver faster, more targeted relief than oral options. The catch: you should not use them for more than three days. After about three days, these sprays can trigger rebound congestion, a condition called rhinitis medicamentosa where your nasal passages swell worse than before, creating a cycle of dependence on the spray.
Nasal Steroid Sprays Reduce Swelling
Over-the-counter nasal steroid sprays like fluticasone (Flonase) and mometasone (Nasonex) are one of the most effective tools for sinus infections. They work by dialing down the inflammatory response inside your nasal passages, reducing the population of immune cells driving swelling and mucus production. Unlike decongestant sprays, nasal steroids are safe for daily use over weeks or even months.
The tradeoff is patience. Nasal steroids don’t provide instant relief the way a decongestant spray does. Most people notice improvement within a few days, but full benefit builds over consistent daily use. For a sinus infection, starting a nasal steroid spray early and using it throughout your illness can keep swelling in check and help your sinuses drain more effectively. Spray technique matters: aim the nozzle slightly outward, toward the ear on the same side, rather than straight up toward the top of your head.
Saline Rinses for Sinus Drainage
Saline nasal irrigation, using a neti pot, squeeze bottle, or similar device, physically flushes mucus, bacteria, and inflammatory debris out of your sinuses. It’s one of the most consistently recommended treatments across clinical guidelines, for both viral and bacterial infections. Many people find it provides more noticeable relief than any single medication.
The one safety rule that matters: never use plain tap water. Tap water can contain organisms, including a rare but dangerous amoeba, that are harmless to swallow but potentially fatal when introduced directly into nasal passages. The CDC recommends using water labeled “distilled” or “sterile,” or boiling tap water at a rolling boil for one minute (three minutes above 6,500 feet elevation) and letting it cool before use. If neither option is available, you can disinfect water with unscented household bleach: five drops per quart for bleach with 4% to 5.9% sodium hypochlorite concentration, or four drops per quart for 6% to 8.25% concentration. Let it stand at least 30 minutes before using.
Guaifenesin for Thick Mucus
Guaifenesin, the active ingredient in Mucinex and many generic expectorants, is designed to thin mucus and make it easier to clear. It works by increasing fluid secretion in the airways, which dilutes thick, sticky mucus so it drains more freely. In theory, this is exactly what you’d want during a sinus infection.
In practice, the clinical evidence is limited. A small randomized trial in patients with chronic nasal congestion found that guaifenesin may produce objective improvements in mucus clearance, but the researchers noted that larger studies are needed to confirm the benefit. Many people report subjective relief, and the side effect profile is mild, so it’s a reasonable option to try if thick mucus is your dominant symptom. It works best when you drink plenty of fluids alongside it.
Putting It All Together
For the first 10 days of a sinus infection, the most effective combination for most people is a nasal steroid spray used daily, saline rinses once or twice a day, pseudoephedrine for the worst of the congestion, and ibuprofen or acetaminophen as needed for pain and pressure. A short course (two to three days only) of a medicated nasal spray like oxymetazoline can help if congestion is severe enough to interfere with sleep. Guaifenesin is a reasonable add-on if thick mucus is a major complaint.
If symptoms haven’t improved at all after 10 days, or if they initially improve and then get significantly worse, those are the signals that a bacterial infection may be involved and antibiotics could help. Even then, the updated guideline position is that watchful waiting remains appropriate for many people, because most bacterial sinus infections also resolve without treatment. The decision to start antibiotics is worth a conversation with your doctor, weighing symptom severity, how long you’ve been sick, and whether you have risk factors that make complications more likely.