Most sinus infections are viral and clear up on their own within 7 to 10 days, so the first thing “given” is often just symptom relief: pain relievers, decongestants, nasal steroid sprays, and saline rinses. Antibiotics only enter the picture when a bacterial infection is suspected, which happens in a minority of cases. Here’s what each treatment does and when it’s appropriate.
Why Most Sinus Infections Don’t Need Antibiotics
The vast majority of sinus infections start as viral illnesses, basically an extension of the common cold. No antibiotic can treat a virus. A bacterial sinus infection is suspected only when symptoms persist without any improvement for at least 10 days, or when you start feeling better and then suddenly get worse again (sometimes called “double sickening”). Thick, discolored nasal discharge alone isn’t enough to tell the difference between viral and bacterial.
Even when doctors suspect bacteria, the signs overlap considerably with viral infections. A 2016 international consensus statement on sinusitis concluded that symptoms like purulent discharge, fever, or facial pain alone cannot reliably distinguish bacterial from viral causes. That’s why the default approach is supportive care first, with antibiotics reserved for cases that clearly aren’t resolving.
Over-the-Counter Pain Relievers and Decongestants
For the pressure and pain that make sinus infections miserable, standard pain relievers like acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) are effective and safe for most people. These reduce both pain from sinus pressure and any accompanying fever.
Decongestants work by shrinking swollen blood vessels in the nasal passages, which opens up the sinuses and lets them drain. They come in oral forms (like pseudoephedrine, sold as Sudafed) and nasal sprays. One important caveat with decongestant nasal sprays: using them for more than three consecutive days can cause rebound congestion, where your swelling comes back worse than before. Oral decongestants don’t carry this risk but can raise blood pressure, so they’re not ideal for everyone.
Nasal Steroid Sprays
Nasal steroid sprays reduce inflammation inside the sinuses and are one of the more evidence-backed treatments for sinus infections of any cause. Clinical trials of mometasone nasal spray showed significant improvement in facial pain, nasal congestion, runny nose, headache, and postnasal drip compared to placebo. The benefits were most noticeable for facial pain and congestion specifically.
These sprays are available over the counter (brands like Flonase and Nasacort use similar ingredients). They take a few days to reach full effect, so they work best when started early and used consistently rather than as a quick fix. Higher doses showed stronger results in studies, with the higher-dose group needing to treat only 8 patients for one to benefit, versus 14 at the lower dose.
Saline Nasal Rinses
Flushing the sinuses with salt water is a simple, drug-free way to thin mucus, remove irritants, and relieve congestion. You can use a neti pot, squeeze bottle, or bulb syringe. The key safety point: never use plain tap water. Tap water can contain organisms, including a rare but dangerous amoeba, that are harmless if swallowed but potentially fatal if introduced directly into the nasal passages.
Safe options for rinse water include store-bought distilled or sterile water, or tap water that has been boiled at a rolling boil for one minute (three minutes at elevations above 6,500 feet) and then cooled. If you can’t boil, you can disinfect water with a few drops of unscented household bleach and let it sit for at least 30 minutes. Pre-mixed saline packets are widely available at pharmacies and take the guesswork out of getting the salt concentration right.
Antibiotics for Bacterial Sinus Infections
When a bacterial infection is confirmed or strongly suspected, amoxicillin is the standard first-line antibiotic. It’s prescribed for 5 to 7 days in adults and 10 to 14 days in children. For people at higher risk of drug-resistant bacteria (those who’ve recently taken antibiotics, for example, or who have severe symptoms), amoxicillin-clavulanate is preferred. The clavulanate component helps the antibiotic work against bacteria that have developed resistance to amoxicillin alone.
If you’re allergic to penicillin, several alternatives exist. Doxycycline is one common option. Others include trimethoprim-sulfamethoxazole (Bactrim) and azithromycin (the well-known Z-pack, typically a three-day course). Your provider will choose based on the severity of your allergy and local resistance patterns.
It’s worth noting that even confirmed bacterial sinus infections often resolve without antibiotics. The decision to prescribe is a judgment call weighing symptom severity, duration, and the likelihood of complications.
What to Expect During Recovery
With or without antibiotics, most sinus infections resolve within two to three weeks. If you’re taking antibiotics, you should notice meaningful improvement within 48 to 72 hours. If you don’t, that’s a signal to follow up, as you may need a different medication or a re-evaluation of the diagnosis.
During recovery, combining approaches tends to work better than relying on any single treatment. Using a saline rinse to clear out mucus, followed by a nasal steroid spray so it can actually reach the sinus lining, along with a pain reliever as needed, covers the major symptoms from different angles.
Signs of a Serious Complication
Sinus infections rarely become dangerous, but the sinuses sit close to the eyes and brain, so infection can occasionally spread to those areas. Seek immediate medical attention if you develop pain, swelling, or redness around the eyes, double vision or other vision changes, a high fever, a stiff neck, or confusion. These symptoms suggest the infection may have moved beyond the sinuses and needs urgent treatment.