Most sinus infections don’t need antibiotics at all. The best medicine depends on whether your infection is viral or bacterial, and roughly 90% of sinus infections start as viral illnesses that resolve on their own. For the minority that are truly bacterial, amoxicillin-clavulanate is the standard first-line antibiotic. But for the majority of people searching this question, a combination of nasal saline rinses, a steroid nasal spray, and the right pain reliever will do more good than any prescription.
Why Most Sinus Infections Don’t Need Antibiotics
Sinus infections typically follow a cold or upper respiratory virus. Your sinuses get inflamed, mucus builds up, and the pressure and congestion can be miserable. But that doesn’t mean bacteria are driving the problem. Viral sinusitis usually improves within 7 to 10 days without any targeted treatment.
Current guidelines from the American Academy of Otolaryngology recommend “watchful waiting” without antibiotics even when bacterial sinusitis is suspected, as long as your symptoms are uncomplicated. A bacterial sinus infection is diagnosed when symptoms like thick nasal discharge, facial pain or pressure, and congestion persist without improvement for at least 10 days, or when symptoms start to get better and then worsen again (sometimes called “double worsening”). If your symptoms haven’t hit that 10-day mark or you haven’t experienced that second wave of worsening, you’re almost certainly dealing with a virus, and antibiotics won’t help.
Saline Rinses: The Most Underrated Treatment
If there’s one thing that consistently helps both viral and bacterial sinus infections, it’s flushing your sinuses with saltwater. Nasal saline irrigation physically washes out mucus, inflammatory debris, and irritants, reducing the bacterial load in your sinuses and helping them drain. Stanford Medicine recommends irrigating each nostril with half a bottle of saline solution twice a day, and notes that doing it more than twice daily is also fine.
You can use a squeeze bottle (like NeilMed) or a neti pot. The critical safety rule: always use distilled or previously boiled water, never straight tap water. Tap water can contain organisms that are harmless in your gut but dangerous in your sinuses. A simple recipe is one teaspoon of non-iodized salt and one teaspoon of baking soda mixed into about a quart of boiled or distilled water.
Nasal Steroid Sprays Reduce Inflammation
Over-the-counter steroid nasal sprays like fluticasone (Flonase) and mometasone (Nasonex) reduce the swelling inside your sinuses, which helps them drain and relieves pressure. A Cochrane review found that people using these sprays were more likely to see their symptoms resolve or improve compared to placebo, with 73% improving versus 66% on placebo. One study found that people using a nasal steroid reached meaningful symptom relief in about 6 days compared to 9.5 days without it.
Higher doses tend to work better. The Cochrane data showed that 400 micrograms of mometasone produced a stronger effect than 200 micrograms. In practical terms, this means using two sprays per nostril rather than one may be more effective during an active infection. These sprays work locally and have minimal side effects, making them a safe addition to your treatment plan for any sinus infection.
Choosing the Right Decongestant
Not all decongestants are equal, and this matters more than most people realize. If you’re reaching for an oral decongestant, pseudoephedrine (the kind sold behind the pharmacy counter) is the one that actually works. In a controlled study, pseudoephedrine significantly improved nasal congestion over a six-hour period compared to both placebo and phenylephrine. Phenylephrine, the decongestant found in most products sitting on the open shelf, performed no better than a sugar pill.
You’ll need to ask the pharmacist for pseudoephedrine and show ID due to purchasing regulations, but it’s still available without a prescription. Avoid it if you have high blood pressure or heart problems, as it can raise blood pressure and heart rate.
Oxymetazoline nasal spray (Afrin) provides fast, powerful decongestion and can be useful for a day or two when you’re completely blocked up. But don’t use it for more than three consecutive days. Beyond that, your nasal tissues start to depend on it and swell up worse when you stop, a cycle called rebound congestion.
Pain Relievers for Sinus Pressure
The facial pain and headache from a sinus infection come from pressure building up in the sinus cavities. Both ibuprofen and acetaminophen are effective here. Ibuprofen has a slight edge because it reduces inflammation in addition to blocking pain, which can help with the swelling that’s causing the pressure in the first place. You can alternate between the two if one alone isn’t enough, since they work through different mechanisms and are safe to use together for short periods.
When Antibiotics Are the Right Call
If your symptoms have persisted beyond 10 days with no improvement, or if you experienced initial improvement followed by a clear worsening, you likely have a bacterial sinus infection. At that point, antibiotics make sense.
The first-line choice is amoxicillin-clavulanate, commonly known by the brand name Augmentin. The clavulanate component helps overcome resistance that many bacteria have developed against plain amoxicillin. If you’re allergic to penicillin, doxycycline is the standard alternative. For people with a penicillin allergy who can still tolerate related antibiotics called cephalosporins, options like cefpodoxime or cefixime can also be used.
Fluoroquinolones like levofloxacin and moxifloxacin are reserved as a last resort. These carry a risk of serious side effects, including tendon damage and nerve problems, and the risk generally outweighs the benefit for a straightforward sinus infection. They should only come into play when none of the safer options are usable.
Symptoms That Need Immediate Attention
Sinus infections rarely cause dangerous complications, but when they do, the infection has typically spread to nearby structures like the eye socket or the brain. Get emergency care if you develop swelling or bulging of an eye, vision changes, a severe headache unlike your usual sinus pressure, a very high fever, or confusion. These symptoms can signal orbital cellulitis or other serious infections that need intravenous treatment, not oral antibiotics. Children are especially vulnerable to the spread of sinus infections into the eye area.
Putting It All Together
For most people, the best treatment plan looks like this: start saline rinses twice daily as soon as symptoms begin, add a nasal steroid spray, use pseudoephedrine for congestion relief, and take ibuprofen or acetaminophen for pain and pressure. This combination addresses every mechanism causing your misery: mucus buildup, inflammation, swelling, and pain. Give it a full 10 days. If you’re not improving at all by then, or if symptoms take a clear turn for the worse after initially getting better, that’s when a conversation about antibiotics makes sense.